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path: root/drivers/pwm/pwm-tiecap.c
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Diffstat (limited to 'drivers/pwm/pwm-tiecap.c')
-rw-r--r--drivers/pwm/pwm-tiecap.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 87c091b245cc..5cf016dd9822 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -25,6 +25,10 @@
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/pwm.h>
+#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
+
+#include "pwm-tipwmss.h"
/* ECAP registers and bits definitions */
#define CAP1 0x08
@@ -184,12 +188,24 @@ static const struct pwm_ops ecap_pwm_ops = {
.owner = THIS_MODULE,
};
+static const struct of_device_id ecap_of_match[] = {
+ { .compatible = "ti,am33xx-ecap" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ecap_of_match);
+
static int ecap_pwm_probe(struct platform_device *pdev)
{
int ret;
struct resource *r;
struct clk *clk;
struct ecap_pwm_chip *pc;
+ u16 status;
+ struct pinctrl *pinctrl;
+
+ pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+ if (IS_ERR(pinctrl))
+ dev_warn(&pdev->dev, "unable to select pin group\n");
pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
if (!pc) {
@@ -211,6 +227,8 @@ static int ecap_pwm_probe(struct platform_device *pdev)
pc->chip.dev = &pdev->dev;
pc->chip.ops = &ecap_pwm_ops;
+ pc->chip.of_xlate = of_pwm_xlate_with_flags;
+ pc->chip.of_pwm_n_cells = 3;
pc->chip.base = -1;
pc->chip.npwm = 1;
@@ -231,14 +249,40 @@ static int ecap_pwm_probe(struct platform_device *pdev)
}
pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ status = pwmss_submodule_state_change(pdev->dev.parent,
+ PWMSS_ECAPCLK_EN);
+ if (!(status & PWMSS_ECAPCLK_EN_ACK)) {
+ dev_err(&pdev->dev, "PWMSS config space clock enable failed\n");
+ ret = -EINVAL;
+ goto pwmss_clk_failure;
+ }
+
+ pm_runtime_put_sync(&pdev->dev);
+
platform_set_drvdata(pdev, pc);
return 0;
+
+pwmss_clk_failure:
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+ pwmchip_remove(&pc->chip);
+ return ret;
}
static int ecap_pwm_remove(struct platform_device *pdev)
{
struct ecap_pwm_chip *pc = platform_get_drvdata(pdev);
+ pm_runtime_get_sync(&pdev->dev);
+ /*
+ * Due to hardware misbehaviour, acknowledge of the stop_req
+ * is missing. Hence checking of the status bit skipped.
+ */
+ pwmss_submodule_state_change(pdev->dev.parent, PWMSS_ECAPCLK_STOP_REQ);
+ pm_runtime_put_sync(&pdev->dev);
+
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
return pwmchip_remove(&pc->chip);
@@ -246,7 +290,9 @@ static int ecap_pwm_remove(struct platform_device *pdev)
static struct platform_driver ecap_pwm_driver = {
.driver = {
- .name = "ecap",
+ .name = "ecap",
+ .owner = THIS_MODULE,
+ .of_match_table = ecap_of_match,
},
.probe = ecap_pwm_probe,
.remove = ecap_pwm_remove,