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Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
-rw-r--r--drivers/acpi/acpi_lpss.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 5edfd9c49044..10347e3d73ad 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -143,6 +143,22 @@ static void lpss_deassert_reset(struct lpss_private_data *pdata)
writel(val, pdata->mmio_base + offset);
}
+/*
+ * BYT PWM used for backlight control by the i915 driver on systems without
+ * the Crystal Cove PMIC.
+ */
+static struct pwm_lookup byt_pwm_lookup[] = {
+ PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0",
+ "pwm_backlight", 0, PWM_POLARITY_NORMAL,
+ "pwm-lpss-platform"),
+};
+
+static void byt_pwm_setup(struct lpss_private_data *pdata)
+{
+ if (!acpi_dev_present("INT33FD", NULL, -1))
+ pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup));
+}
+
#define LPSS_I2C_ENABLE 0x6c
static void byt_i2c_setup(struct lpss_private_data *pdata)
@@ -200,6 +216,7 @@ static const struct lpss_device_desc lpt_sdio_dev_desc = {
static const struct lpss_device_desc byt_pwm_dev_desc = {
.flags = LPSS_SAVE_CTX,
+ .setup = byt_pwm_setup,
};
static const struct lpss_device_desc bsw_pwm_dev_desc = {