From: Jernej Skrabec <[email protected]> H6 PWM core needs deasserted reset line in order to work.
Add an optional probe for it. Signed-off-by: Jernej Skrabec <[email protected]> Reviewed-by: Uwe Kleine-König <[email protected]> Signed-off-by: Clément Péron <[email protected]> --- drivers/pwm/pwm-sun4i.c | 34 ++++++++++++++++++++++++++++++++-- 1 file changed, 32 insertions(+), 2 deletions(-) diff --git a/drivers/pwm/pwm-sun4i.c b/drivers/pwm/pwm-sun4i.c index 581d23287333..e353a03ec614 100644 --- a/drivers/pwm/pwm-sun4i.c +++ b/drivers/pwm/pwm-sun4i.c @@ -16,6 +16,7 @@ #include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/pwm.h> +#include <linux/reset.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/time.h> @@ -78,6 +79,7 @@ struct sun4i_pwm_data { struct sun4i_pwm_chip { struct pwm_chip chip; struct clk *clk; + struct reset_control *rst; void __iomem *base; spinlock_t ctrl_lock; const struct sun4i_pwm_data *data; @@ -364,6 +366,22 @@ static int sun4i_pwm_probe(struct platform_device *pdev) if (IS_ERR(pwm->clk)) return PTR_ERR(pwm->clk); + pwm->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL); + if (IS_ERR(pwm->rst)) { + if (PTR_ERR(pwm->rst) != -EPROBE_DEFER) + dev_err(&pdev->dev, "get reset failed %pe\n", + pwm->rst); + return PTR_ERR(pwm->rst); + } + + /* Deassert reset */ + ret = reset_control_deassert(pwm->rst); + if (ret) { + dev_err(&pdev->dev, "Cannot deassert reset control: %d\n", + ret); + return ret; + } + pwm->chip.dev = &pdev->dev; pwm->chip.ops = &sun4i_pwm_ops; pwm->chip.base = -1; @@ -376,19 +394,31 @@ static int sun4i_pwm_probe(struct platform_device *pdev) ret = pwmchip_add(&pwm->chip); if (ret < 0) { dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret); - return ret; + goto err_pwm_add; } platform_set_drvdata(pdev, pwm); return 0; + +err_pwm_add: + reset_control_assert(pwm->rst); + + return ret; } static int sun4i_pwm_remove(struct platform_device *pdev) { struct sun4i_pwm_chip *pwm = platform_get_drvdata(pdev); + int ret; + + ret = pwmchip_remove(&pwm->chip); + if (ret) + return ret; + + reset_control_assert(pwm->rst); - return pwmchip_remove(&pwm->chip); + return 0; } static struct platform_driver sun4i_pwm_driver = { -- 2.20.1 -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20191121195902.6906-2-peron.clem%40gmail.com.
