From: Rohith Seelaboyina <rseelaboyina@xxxxxxxxxx>
Add reset control of the PWM controller to reset it before
accessing the PWM register.
Signed-off-by: Rohith Seelaboyina <rseelaboyina@xxxxxxxxxx>
Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx>
---
drivers/pwm/pwm-tegra.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
index d4de060..71b9c4d 100644
--- a/drivers/pwm/pwm-tegra.c
+++ b/drivers/pwm/pwm-tegra.c
@@ -29,6 +29,7 @@
#include <linux/pwm.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/reset.h>
#define PWM_ENABLE (1 << 31)
#define PWM_DUTY_WIDTH 8
@@ -43,6 +44,7 @@ struct tegra_pwm_chip {
struct device *dev;
struct clk *clk;
+ struct reset_control *rstc;
void __iomem *mmio_base;
};
@@ -189,6 +191,14 @@ static int tegra_pwm_probe(struct platform_device *pdev)
if (IS_ERR(pwm->clk))
return PTR_ERR(pwm->clk);
+ pwm->rstc = devm_reset_control_get(&pdev->dev, "pwm");
+ if (IS_ERR(pwm->rstc)) {
+ ret = PTR_ERR(pwm->rstc);
+ dev_err(&pdev->dev, "Reset control is not found: %d\n", ret);
+ return ret;
+ }
+ reset_control_reset(pwm->rstc);
+
pwm->chip.dev = &pdev->dev;
pwm->chip.ops = &tegra_pwm_ops;
pwm->chip.base = -1;
--
2.1.4
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