Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:

 - new driver for ICY, an Amiga Zorro card :)

 - axxia driver gained slave mode support, NXP driver gained ACPI

 - the slave EEPROM backend gained 16 bit address support

 - and lots of regular driver updates and reworks

* 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (52 commits)
  i2c: tegra: Move suspend handling to NOIRQ phase
  i2c: imx: ACPI support for NXP i2c controller
  i2c: uniphier(-f): remove all dev_dbg()
  i2c: uniphier(-f): use devm_platform_ioremap_resource()
  i2c: slave-eeprom: Add comment about address handling
  i2c: exynos5: Remove IRQF_ONESHOT
  i2c: stm32f7: Make structure stm32f7_i2c_algo constant
  i2c: cht-wc: drop check because i2c_unregister_device() is NULL safe
  i2c-eeprom_slave: Add support for more eeprom models
  i2c: fsi: Add of_put_node() before break
  i2c: synquacer: Make synquacer_i2c_ops constant
  i2c: hix5hd2: Remove IRQF_ONESHOT
  i2c: i801: Use iTCO version 6 in Cannon Lake PCH and beyond
  watchdog: iTCO: Add support for Cannon Lake PCH iTCO
  i2c: iproc: Make bcm_iproc_i2c_quirks constant
  i2c: iproc: Add full name of devicetree node to adapter name
  i2c: piix4: Add ACPI support
  i2c: piix4: Fix probing of reserved ports on AMD Family 16h Model 30h
  i2c: ocores: use request_any_context_irq() to register IRQ handler
  i2c: designware: Fix optional reset error handling
  ...

42 files changed, 795 insertions, 267 deletions

diff --git a/Documentation/devicetree/bindings/i2c/brcm,bcm2835-i2c.txt b/Documentation/devicetree/bindings/i2c/brcm,bcm2835-i2c.txt
index e9de3756752b..c9a6587fe4bb 100644
--- a/Documentation/devicetree/bindings/i2c/brcm,bcm2835-i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/brcm,bcm2835-i2c.txt
@@ -1,7 +1,9 @@
 Broadcom BCM2835 I2C controller
 
 Required properties:
-- compatible : Should be "brcm,bcm2835-i2c".
+- compatible : Should be one of:
+	"brcm,bcm2711-i2c"
+	"brcm,bcm2835-i2c"
 - reg: Should contain register location and length.
 - interrupts: Should contain interrupt.
 - clocks : The clock feeding the I2C controller.
diff --git a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt b/Documentation/devicetree/bindings/i2c/renesas,i2c.txt
index 3ee5e8f6ee01..3ee5e8f6ee01 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-rcar.txt
+++ b/Documentation/devicetree/bindings/i2c/renesas,i2c.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-emev2.txt b/Documentation/devicetree/bindings/i2c/renesas,iic-emev2.txt
index 5ed1ea1c7e14..5ed1ea1c7e14 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-emev2.txt
+++ b/Documentation/devicetree/bindings/i2c/renesas,iic-emev2.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt b/Documentation/devicetree/bindings/i2c/renesas,iic.txt
index 202602e6e837..202602e6e837 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt
+++ b/Documentation/devicetree/bindings/i2c/renesas,iic.txt
diff --git a/Documentation/devicetree/bindings/i2c/i2c-riic.txt b/Documentation/devicetree/bindings/i2c/renesas,riic.txt
index e26fe3ad86a9..e26fe3ad86a9 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-riic.txt
+++ b/Documentation/devicetree/bindings/i2c/renesas,riic.txt
diff --git a/MAINTAINERS b/MAINTAINERS
index 54f1286087e9..a8d193a74692 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7865,6 +7865,12 @@ S:	Maintained
 F:	drivers/mfd/lpc_ich.c
 F:	drivers/gpio/gpio-ich.c
 
+ICY I2C DRIVER
+M:	Max Staudt <max@enpas.org>
+L:	linux-i2c@vger.kernel.org
+S:	Maintained
+F:	drivers/i2c/busses/i2c-icy.c
+
 IDE SUBSYSTEM
 M:	"David S. Miller" <davem@davemloft.net>
 L:	linux-ide@vger.kernel.org
@@ -13791,7 +13797,7 @@ F:	drivers/clk/renesas/
 RENESAS EMEV2 I2C DRIVER
 M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
 S:	Supported
-F:	Documentation/devicetree/bindings/i2c/i2c-emev2.txt
+F:	Documentation/devicetree/bindings/i2c/renesas,iic-emev2.txt
 F:	drivers/i2c/busses/i2c-emev2.c
 
 RENESAS ETHERNET DRIVERS
@@ -13813,15 +13819,15 @@ F:	drivers/iio/adc/rcar-gyroadc.c
 RENESAS R-CAR I2C DRIVERS
 M:	Wolfram Sang <wsa+renesas@sang-engineering.com>
 S:	Supported
-F:	Documentation/devicetree/bindings/i2c/i2c-rcar.txt
-F:	Documentation/devicetree/bindings/i2c/i2c-sh_mobile.txt
+F:	Documentation/devicetree/bindings/i2c/renesas,i2c.txt
+F:	Documentation/devicetree/bindings/i2c/renesas,iic.txt
 F:	drivers/i2c/busses/i2c-rcar.c
 F:	drivers/i2c/busses/i2c-sh_mobile.c
 
 RENESAS RIIC DRIVER
 M:	Chris Brandt <chris.brandt@renesas.com>
 S:	Supported
-F:	Documentation/devicetree/bindings/i2c/i2c-riic.txt
+F:	Documentation/devicetree/bindings/i2c/renesas,riic.txt
 F:	drivers/i2c/busses/i2c-riic.c
 
 RENESAS USB PHY DRIVER
diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
index 7cd0c9ac71ea..71511ae2dfcd 100644
--- a/drivers/acpi/acpi_apd.c
+++ b/drivers/acpi/acpi_apd.c
@@ -160,11 +160,17 @@ static const struct apd_device_desc hip08_i2c_desc = {
 	.setup = acpi_apd_setup,
 	.fixed_clk_rate = 250000000,
 };
+
 static const struct apd_device_desc thunderx2_i2c_desc = {
 	.setup = acpi_apd_setup,
 	.fixed_clk_rate = 125000000,
 };
 
+static const struct apd_device_desc nxp_i2c_desc = {
+	.setup = acpi_apd_setup,
+	.fixed_clk_rate = 350000000,
+};
+
 static const struct apd_device_desc hip08_spi_desc = {
 	.setup = acpi_apd_setup,
 	.fixed_clk_rate = 250000000,
@@ -238,6 +244,7 @@ static const struct acpi_device_id acpi_apd_device_ids[] = {
 	{ "HISI02A1", APD_ADDR(hip07_i2c_desc) },
 	{ "HISI02A2", APD_ADDR(hip08_i2c_desc) },
 	{ "HISI0173", APD_ADDR(hip08_spi_desc) },
+	{ "NXP0001", APD_ADDR(nxp_i2c_desc) },
 #endif
 	{ }
 };
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 98bccace8c1c..3d61c4fb4dec 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -978,10 +978,10 @@ static int adv7511_init_cec_regmap(struct adv7511 *adv)
 {
 	int ret;
 
-	adv->i2c_cec = i2c_new_secondary_device(adv->i2c_main, "cec",
+	adv->i2c_cec = i2c_new_ancillary_device(adv->i2c_main, "cec",
 						ADV7511_CEC_I2C_ADDR_DEFAULT);
-	if (!adv->i2c_cec)
-		return -EINVAL;
+	if (IS_ERR(adv->i2c_cec))
+		return PTR_ERR(adv->i2c_cec);
 	i2c_set_clientdata(adv->i2c_cec, adv);
 
 	adv->regmap_cec = devm_regmap_init_i2c(adv->i2c_cec,
@@ -1162,20 +1162,20 @@ static int adv7511_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 
 	adv7511_packet_disable(adv7511, 0xffff);
 
-	adv7511->i2c_edid = i2c_new_secondary_device(i2c, "edid",
+	adv7511->i2c_edid = i2c_new_ancillary_device(i2c, "edid",
 					ADV7511_EDID_I2C_ADDR_DEFAULT);
-	if (!adv7511->i2c_edid) {
-		ret = -EINVAL;
+	if (IS_ERR(adv7511->i2c_edid)) {
+		ret = PTR_ERR(adv7511->i2c_edid);
 		goto uninit_regulators;
 	}
 
 	regmap_write(adv7511->regmap, ADV7511_REG_EDID_I2C_ADDR,
 		     adv7511->i2c_edid->addr << 1);
 
-	adv7511->i2c_packet = i2c_new_secondary_device(i2c, "packet",
+	adv7511->i2c_packet = i2c_new_ancillary_device(i2c, "packet",
 					ADV7511_PACKET_I2C_ADDR_DEFAULT);
-	if (!adv7511->i2c_packet) {
-		ret = -EINVAL;
+	if (IS_ERR(adv7511->i2c_packet)) {
+		ret = PTR_ERR(adv7511->i2c_packet);
 		goto err_i2c_unregister_edid;
 	}
 
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 5587215b8ddb..146ce40d8e0a 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -429,6 +429,7 @@ config I2C_AXXIA
 	tristate "Axxia I2C controller"
 	depends on ARCH_AXXIA || COMPILE_TEST
 	default ARCH_AXXIA
+	select I2C_SLAVE
 	help
 	  Say yes if you want to support the I2C bus on Axxia platforms.
 
@@ -977,7 +978,7 @@ config I2C_SIRF
 	  will be called i2c-sirf.
 
 config I2C_SPRD
-	bool "Spreadtrum I2C interface"
+	tristate "Spreadtrum I2C interface"
 	depends on I2C=y && ARCH_SPRD
 	help
 	  If you say yes to this option, support will be included for the
@@ -1309,6 +1310,20 @@ config I2C_ELEKTOR
 	  This support is also available as a module.  If so, the module
 	  will be called i2c-elektor.
 
+config I2C_ICY
+	tristate "ICY Zorro card"
+	depends on ZORRO
+	select I2C_ALGOPCF
+	help
+	  This supports the PCF8584 Zorro bus I2C adapter, known as ICY.
+	  Say Y if you own such an adapter.
+
+	  This support is also available as a module.  If so, the module
+	  will be called i2c-icy.
+
+	  If you have a 2019 edition board with an LTC2990 sensor at address
+	  0x4c, loading the module 'ltc2990' is sufficient to enable it.
+
 config I2C_MLXCPLD
 	tristate "Mellanox I2C driver"
 	depends on X86_64
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 80c23895eaaf..3ab8aebc39c9 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -140,6 +140,7 @@ obj-$(CONFIG_I2C_BCM_KONA)	+= i2c-bcm-kona.o
 obj-$(CONFIG_I2C_BRCMSTB)	+= i2c-brcmstb.o
 obj-$(CONFIG_I2C_CROS_EC_TUNNEL)	+= i2c-cros-ec-tunnel.o
 obj-$(CONFIG_I2C_ELEKTOR)	+= i2c-elektor.o
+obj-$(CONFIG_I2C_ICY)		+= i2c-icy.o
 obj-$(CONFIG_I2C_MLXCPLD)	+= i2c-mlxcpld.o
 obj-$(CONFIG_I2C_OPAL)		+= i2c-opal.o
 obj-$(CONFIG_I2C_PCA_ISA)	+= i2c-pca-isa.o
diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c
index ff3142b15cab..0214daa913ff 100644
--- a/drivers/i2c/busses/i2c-axxia.c
+++ b/drivers/i2c/busses/i2c-axxia.c
@@ -77,6 +77,40 @@
 				 MST_STATUS_IP)
 #define MST_TX_BYTES_XFRD	0x50
 #define MST_RX_BYTES_XFRD	0x54
+#define SLV_ADDR_DEC_CTL	0x58
+#define   SLV_ADDR_DEC_GCE	BIT(0)  /* ACK to General Call Address from own master (loopback) */
+#define   SLV_ADDR_DEC_OGCE	BIT(1)  /* ACK to General Call Address from external masters */
+#define   SLV_ADDR_DEC_SA1E	BIT(2)  /* ACK to addr_1 enabled */
+#define   SLV_ADDR_DEC_SA1M	BIT(3)  /* 10-bit addressing for addr_1 enabled */
+#define   SLV_ADDR_DEC_SA2E	BIT(4)  /* ACK to addr_2 enabled */
+#define   SLV_ADDR_DEC_SA2M	BIT(5)  /* 10-bit addressing for addr_2 enabled */
+#define SLV_ADDR_1		0x5c
+#define SLV_ADDR_2		0x60
+#define SLV_RX_CTL		0x64
+#define   SLV_RX_ACSA1		BIT(0)  /* Generate ACK for writes to addr_1 */
+#define   SLV_RX_ACSA2		BIT(1)  /* Generate ACK for writes to addr_2 */
+#define   SLV_RX_ACGCA		BIT(2)  /* ACK data phase transfers to General Call Address */
+#define SLV_DATA		0x68
+#define SLV_RX_FIFO		0x6c
+#define   SLV_FIFO_DV1		BIT(0)  /* Data Valid for addr_1 */
+#define   SLV_FIFO_DV2		BIT(1)  /* Data Valid for addr_2 */
+#define   SLV_FIFO_AS		BIT(2)  /* (N)ACK Sent */
+#define   SLV_FIFO_TNAK		BIT(3)  /* Timeout NACK */
+#define   SLV_FIFO_STRC		BIT(4)  /* First byte after start condition received */
+#define   SLV_FIFO_RSC		BIT(5)  /* Repeated Start Condition */
+#define   SLV_FIFO_STPC		BIT(6)  /* Stop Condition */
+#define   SLV_FIFO_DV		(SLV_FIFO_DV1 | SLV_FIFO_DV2)
+#define SLV_INT_ENABLE		0x70
+#define SLV_INT_STATUS		0x74
+#define   SLV_STATUS_RFH	BIT(0)  /* FIFO service */
+#define   SLV_STATUS_WTC	BIT(1)  /* Write transfer complete */
+#define   SLV_STATUS_SRS1	BIT(2)  /* Slave read from addr 1 */
+#define   SLV_STATUS_SRRS1	BIT(3)  /* Repeated start from addr 1 */
+#define   SLV_STATUS_SRND1	BIT(4)  /* Read request not following start condition */
+#define   SLV_STATUS_SRC1	BIT(5)  /* Read canceled */
+#define   SLV_STATUS_SRAT1	BIT(6)  /* Slave Read timed out */
+#define   SLV_STATUS_SRDRE1	BIT(7)  /* Data written after timed out */
+#define SLV_READ_DUMMY		0x78
 #define SCL_HIGH_PERIOD		0x80
 #define SCL_LOW_PERIOD		0x84
 #define SPIKE_FLTR_LEN		0x88
@@ -111,6 +145,8 @@ struct axxia_i2c_dev {
 	struct clk *i2c_clk;
 	u32 bus_clk_rate;
 	bool last;
+	struct i2c_client *slave;
+	int irq;
 };
 
 static void i2c_int_disable(struct axxia_i2c_dev *idev, u32 mask)
@@ -276,13 +312,65 @@ static int axxia_i2c_fill_tx_fifo(struct axxia_i2c_dev *idev)
 	return ret;
 }
 
+static void axxia_i2c_slv_fifo_event(struct axxia_i2c_dev *idev)
+{
+	u32 fifo_status = readl(idev->base + SLV_RX_FIFO);
+	u8 val;
+
+	dev_dbg(idev->dev, "slave irq fifo_status=0x%x\n", fifo_status);
+
+	if (fifo_status & SLV_FIFO_DV1) {
+		if (fifo_status & SLV_FIFO_STRC)
+			i2c_slave_event(idev->slave,
+					I2C_SLAVE_WRITE_REQUESTED, &val);
+
+		val = readl(idev->base + SLV_DATA);
+		i2c_slave_event(idev->slave, I2C_SLAVE_WRITE_RECEIVED, &val);
+	}
+	if (fifo_status & SLV_FIFO_STPC) {
+		readl(idev->base + SLV_DATA); /* dummy read */
+		i2c_slave_event(idev->slave, I2C_SLAVE_STOP, &val);
+	}
+	if (fifo_status & SLV_FIFO_RSC)
+		readl(idev->base + SLV_DATA); /* dummy read */
+}
+
+static irqreturn_t axxia_i2c_slv_isr(struct axxia_i2c_dev *idev)
+{
+	u32 status = readl(idev->base + SLV_INT_STATUS);
+	u8 val;
+
+	dev_dbg(idev->dev, "slave irq status=0x%x\n", status);
+
+	if (status & SLV_STATUS_RFH)
+		axxia_i2c_slv_fifo_event(idev);
+	if (status & SLV_STATUS_SRS1) {
+		i2c_slave_event(idev->slave, I2C_SLAVE_READ_REQUESTED, &val);
+		writel(val, idev->base + SLV_DATA);
+	}
+	if (status & SLV_STATUS_SRND1) {
+		i2c_slave_event(idev->slave, I2C_SLAVE_READ_PROCESSED, &val);
+		writel(val, idev->base + SLV_DATA);
+	}
+	if (status & SLV_STATUS_SRC1)
+		i2c_slave_event(idev->slave, I2C_SLAVE_STOP, &val);
+
+	writel(INT_SLV, idev->base + INTERRUPT_STATUS);
+	return IRQ_HANDLED;
+}
+
 static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
 {
 	struct axxia_i2c_dev *idev = _dev;
+	irqreturn_t ret = IRQ_NONE;
 	u32 status;
 
-	if (!(readl(idev->base + INTERRUPT_STATUS) & INT_MST))
-		return IRQ_NONE;
+	status = readl(idev->base + INTERRUPT_STATUS);
+
+	if (status & INT_SLV)
+		ret = axxia_i2c_slv_isr(idev);
+	if (!(status & INT_MST))
+		return ret;
 
 	/* Read interrupt status bits */
 	status = readl(idev->base + MST_INT_STATUS);
@@ -583,9 +671,58 @@ static u32 axxia_i2c_func(struct i2c_adapter *adap)
 	return caps;
 }
 
+static int axxia_i2c_reg_slave(struct i2c_client *slave)
+{
+	struct axxia_i2c_dev *idev = i2c_get_adapdata(slave->adapter);
+	u32 slv_int_mask = SLV_STATUS_RFH;
+	u32 dec_ctl;
+
+	if (idev->slave)
+		return -EBUSY;
+
+	idev->slave = slave;
+
+	/* Enable slave mode as well */
+	writel(GLOBAL_MST_EN | GLOBAL_SLV_EN, idev->base + GLOBAL_CONTROL);
+	writel(INT_MST | INT_SLV, idev->base + INTERRUPT_ENABLE);
+
+	/* Set slave address */
+	dec_ctl = SLV_ADDR_DEC_SA1E;
+	if (slave->flags & I2C_CLIENT_TEN)
+		dec_ctl |= SLV_ADDR_DEC_SA1M;
+
+	writel(SLV_RX_ACSA1, idev->base + SLV_RX_CTL);
+	writel(dec_ctl, idev->base + SLV_ADDR_DEC_CTL);
+	writel(slave->addr, idev->base + SLV_ADDR_1);
+
+	/* Enable interrupts */
+	slv_int_mask |= SLV_STATUS_SRS1 | SLV_STATUS_SRRS1 | SLV_STATUS_SRND1;
+	slv_int_mask |= SLV_STATUS_SRC1;
+	writel(slv_int_mask, idev->base + SLV_INT_ENABLE);
+
+	return 0;
+}
+
+static int axxia_i2c_unreg_slave(struct i2c_client *slave)
+{
+	struct axxia_i2c_dev *idev = i2c_get_adapdata(slave->adapter);
+
+	/* Disable slave mode */
+	writel(GLOBAL_MST_EN, idev->base + GLOBAL_CONTROL);
+	writel(INT_MST, idev->base + INTERRUPT_ENABLE);
+
+	synchronize_irq(idev->irq);
+
+	idev->slave = NULL;
+
+	return 0;
+}
+
 static const struct i2c_algorithm axxia_i2c_algo = {
 	.master_xfer = axxia_i2c_xfer,
 	.functionality = axxia_i2c_func,
+	.reg_slave = axxia_i2c_reg_slave,
+	.unreg_slave = axxia_i2c_unreg_slave,
 };
 
 static const struct i2c_adapter_quirks axxia_i2c_quirks = {
@@ -599,7 +736,6 @@ static int axxia_i2c_probe(struct platform_device *pdev)
 	struct axxia_i2c_dev *idev = NULL;
 	struct resource *res;
 	void __iomem *base;
-	int irq;
 	int ret = 0;
 
 	idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL);
@@ -611,10 +747,10 @@ static int axxia_i2c_probe(struct platform_device *pdev)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
+	idev->irq = platform_get_irq(pdev, 0);
+	if (idev->irq < 0) {
 		dev_err(&pdev->dev, "missing interrupt resource\n");
-		return irq;
+		return idev->irq;
 	}
 
 	idev->i2c_clk = devm_clk_get(&pdev->dev, "i2c");
@@ -643,10 +779,10 @@ static int axxia_i2c_probe(struct platform_device *pdev)
 		goto error_disable_clk;
 	}
 
-	ret = devm_request_irq(&pdev->dev, irq, axxia_i2c_isr, 0,
+	ret = devm_request_irq(&pdev->dev, idev->irq, axxia_i2c_isr, 0,
 			       pdev->name, idev);
 	if (ret) {
-		dev_err(&pdev->dev, "failed to claim IRQ%d\n", irq);
+		dev_err(&pdev->dev, "failed to claim IRQ%d\n", idev->irq);
 		goto error_disable_clk;
 	}
 
diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
index 19ef2b0c682a..9ffdffaf6141 100644
--- a/drivers/i2c/busses/i2c-bcm-iproc.c
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -808,7 +808,7 @@ static struct i2c_algorithm bcm_iproc_algo = {
 	.unreg_slave = bcm_iproc_i2c_unreg_slave,
 };
 
-static struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
+static const struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
 	.max_read_len = M_RX_MAX_READ_LEN,
 };
 
@@ -922,7 +922,9 @@ static int bcm_iproc_i2c_probe(struct platform_device *pdev)
 
 	adap = &iproc_i2c->adapter;
 	i2c_set_adapdata(adap, iproc_i2c);
-	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
+	snprintf(adap->name, sizeof(adap->name),
+		"Broadcom iProc (%s)",
+		of_node_full_name(iproc_i2c->device->of_node));
 	adap->algo = &bcm_iproc_algo;
 	adap->quirks = &bcm_iproc_i2c_quirks;
 	adap->dev.parent = &pdev->dev;
diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index 67752f7b0371..e01b2b57e724 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -12,6 +12,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
@@ -389,7 +390,7 @@ static const struct i2c_algorithm bcm2835_i2c_algo = {
 };
 
 /*
- * This HW was reported to have problems with clock stretching:
+ * The BCM2835 was reported to have problems with clock stretching:
  * http://www.advamation.com/knowhow/raspberrypi/rpi-i2c-bug.html
  * https://www.raspberrypi.org/forums/viewtopic.php?p=146272
  */
@@ -471,11 +472,12 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 	i2c_set_adapdata(adap, i2c_dev);
 	adap->owner = THIS_MODULE;
 	adap->class = I2C_CLASS_DEPRECATED;
-	strlcpy(adap->name, "bcm2835 I2C adapter", sizeof(adap->name));
+	snprintf(adap->name, sizeof(adap->name), "bcm2835 (%s)",
+		 of_node_full_name(pdev->dev.of_node));
 	adap->algo = &bcm2835_i2c_algo;
 	adap->dev.parent = &pdev->dev;
 	adap->dev.of_node = pdev->dev.of_node;
-	adap->quirks = &bcm2835_i2c_quirks;
+	adap->quirks = of_device_get_match_data(&pdev->dev);
 
 	bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, 0);
 
@@ -501,7 +503,8 @@ static int bcm2835_i2c_remove(struct platform_device *pdev)
 }
 
 static const struct of_device_id bcm2835_i2c_of_match[] = {
-	{ .compatible = "brcm,bcm2835-i2c" },
+	{ .compatible = "brcm,bcm2711-i2c" },
+	{ .compatible = "brcm,bcm2835-i2c", .data = &bcm2835_i2c_quirks },
 	{},
 };
 MODULE_DEVICE_TABLE(of, bcm2835_i2c_of_match);
diff --git a/drivers/i2c/busses/i2c-cht-wc.c b/drivers/i2c/busses/i2c-cht-wc.c
index 66af44bfa67d..b8fde61bb5d8 100644
--- a/drivers/i2c/busses/i2c-cht-wc.c
+++ b/drivers/i2c/busses/i2c-cht-wc.c
@@ -178,6 +178,51 @@ static const struct i2c_algorithm cht_wc_i2c_adap_algo = {
 	.smbus_xfer = cht_wc_i2c_adap_smbus_xfer,
 };
 
+/*
+ * We are an i2c-adapter which itself is part of an i2c-client. This means that
+ * transfers done through us take adapter->bus_lock twice, once for our parent
+ * i2c-adapter and once to take our own bus_lock. Lockdep does not like this
+ * nested locking, to make lockdep happy in the case of busses with muxes, the
+ * i2c-core's i2c_adapter_lock_bus function calls:
+ * rt_mutex_lock_nested(&adapter->bus_lock, i2c_adapter_depth(adapter));
+ *
+ * But i2c_adapter_depth only works when the direct parent of the adapter is
+ * another adapter, as it is only meant for muxes. In our case there is an
+ * i2c-client and MFD instantiated platform_device in the parent->child chain
+ * between the 2 devices.
+ *
+ * So we override the default i2c_lock_operations and pass a hardcoded
+ * depth of 1 to rt_mutex_lock_nested, to make lockdep happy.
+ *
+ * Note that if there were to be a mux attached to our adapter, this would
+ * break things again since the i2c-mux code expects the root-adapter to have
+ * a locking depth of 0. But we always have only 1 client directly attached
+ * in the form of the Charger IC paired with the CHT Whiskey Cove PMIC.
+ */
+static void cht_wc_i2c_adap_lock_bus(struct i2c_adapter *adapter,
+				 unsigned int flags)
+{
+	rt_mutex_lock_nested(&adapter->bus_lock, 1);
+}
+
+static int cht_wc_i2c_adap_trylock_bus(struct i2c_adapter *adapter,
+				   unsigned int flags)
+{
+	return rt_mutex_trylock(&adapter->bus_lock);
+}
+
+static void cht_wc_i2c_adap_unlock_bus(struct i2c_adapter *adapter,
+				   unsigned int flags)
+{
+	rt_mutex_unlock(&adapter->bus_lock);
+}
+
+static const struct i2c_lock_operations cht_wc_i2c_adap_lock_ops = {
+	.lock_bus =    cht_wc_i2c_adap_lock_bus,
+	.trylock_bus = cht_wc_i2c_adap_trylock_bus,
+	.unlock_bus =  cht_wc_i2c_adap_unlock_bus,
+};
+
 /**** irqchip for the client connected to the extchgr i2c adapter ****/
 static void cht_wc_i2c_irq_lock(struct irq_data *data)
 {
@@ -286,6 +331,7 @@ static int cht_wc_i2c_adap_i2c_probe(struct platform_device *pdev)
 	adap->adapter.owner = THIS_MODULE;
 	adap->adapter.class = I2C_CLASS_HWMON;
 	adap->adapter.algo = &cht_wc_i2c_adap_algo;
+	adap->adapter.lock_ops = &cht_wc_i2c_adap_lock_ops;
 	strlcpy(adap->adapter.name, "PMIC I2C Adapter",
 		sizeof(adap->adapter.name));
 	adap->adapter.dev.parent = &pdev->dev;
@@ -363,8 +409,7 @@ static int cht_wc_i2c_adap_i2c_remove(struct platform_device *pdev)
 {
 	struct cht_wc_i2c_adap *adap = platform_get_drvdata(pdev);
 
-	if (adap->client)
-		i2c_unregister_device(adap->client);
+	i2c_unregister_device(adap->client);
 	i2c_del_adapter(&adap->adapter);
 	irq_domain_remove(adap->irq_domain);
 
diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index d464799e40a3..e8b328242256 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -655,15 +655,11 @@ static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
 	struct i2c_bus_recovery_info *rinfo = &dev->rinfo;
 	struct i2c_adapter *adap = &dev->adapter;
 	struct gpio_desc *gpio;
-	int r;
-
-	gpio = devm_gpiod_get(dev->dev, "scl", GPIOD_OUT_HIGH);
-	if (IS_ERR(gpio)) {
-		r = PTR_ERR(gpio);
-		if (r == -ENOENT || r == -ENOSYS)
-			return 0;
-		return r;
-	}
+
+	gpio = devm_gpiod_get_optional(dev->dev, "scl", GPIOD_OUT_HIGH);
+	if (IS_ERR_OR_NULL(gpio))
+		return PTR_ERR_OR_ZERO(gpio);
+
 	rinfo->scl_gpiod = gpio;
 
 	gpio = devm_gpiod_get_optional(dev->dev, "sda", GPIOD_IN);
diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
index 76810deb2de6..050adda7c1bd 100644
--- a/drivers/i2c/busses/i2c-designware-pcidrv.c
+++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
@@ -33,6 +33,7 @@ enum dw_pci_ctl_id_t {
 	baytrail,
 	cherrytrail,
 	haswell,
+	elkhartlake,
 };
 
 struct dw_scl_sda_cfg {
@@ -168,13 +169,20 @@ static struct dw_pci_controller dw_pci_controllers[] = {
 		.flags = MODEL_CHERRYTRAIL,
 		.scl_sda_cfg = &byt_config,
 	},
+	[elkhartlake] = {
+		.bus_num = -1,
+		.bus_cfg = INTEL_MID_STD_CFG | DW_IC_CON_SPEED_FAST,
+		.tx_fifo_depth = 32,
+		.rx_fifo_depth = 32,
+		.functionality = I2C_FUNC_10BIT_ADDR,
+		.clk_khz = 100000,
+	},
 };
 
 #ifdef CONFIG_PM
 static int i2c_dw_pci_suspend(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
+	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
 
 	i_dev->suspended = true;
 	i_dev->disable(i_dev);
@@ -184,8 +192,7 @@ static int i2c_dw_pci_suspend(struct device *dev)
 
 static int i2c_dw_pci_resume(struct device *dev)
 {
-	struct pci_dev *pdev = to_pci_dev(dev);
-	struct dw_i2c_dev *i_dev = pci_get_drvdata(pdev);
+	struct dw_i2c_dev *i_dev = dev_get_drvdata(dev);
 	int ret;
 
 	ret = i_dev->init(i_dev);
@@ -227,6 +234,8 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
 		return r;
 	}
 
+	pci_set_master(pdev);
+
 	r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
 	if (