diff options
| author | Lee Jones <lee.jones@linaro.org> | 2016-08-16 12:35:02 +0300 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2016-09-08 11:55:09 +0300 |
| commit | d66a928dc08f59b2c03bc22e910b058b4ea01f92 (patch) | |
| tree | 867d190f40d48c42a5471c69a106d98759202b2c /drivers | |
| parent | f66d78faf2dc4845e06d42854769968c4166fe6c (diff) | |
| download | linux-d66a928dc08f59b2c03bc22e910b058b4ea01f92.tar.xz | |
pwm: sti: Supply PWM Capture clock handling
ST's PWM IP is supplied by 2 different clocks. One for PWM output and
the other for capture. This patch provides clock handling for the
latter.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pwm/pwm-sti.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index 4e8ff9e04f77..711c33643259 100644 --- a/drivers/pwm/pwm-sti.c +++ b/drivers/pwm/pwm-sti.c @@ -74,6 +74,7 @@ struct sti_pwm_compat_data { struct sti_pwm_chip { struct device *dev; struct clk *pwm_clk; + struct clk *cpt_clk; struct regmap *regmap; struct sti_pwm_compat_data *cdata; struct regmap_field *prescale_low; @@ -183,6 +184,10 @@ static int sti_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, if (ret) return ret; + ret = clk_enable(pc->cpt_clk); + if (ret) + return ret; + if (!period_same) { ret = sti_pwm_get_prescale(pc, period_ns, &prescale); if (ret) @@ -227,6 +232,7 @@ static int sti_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, clk_dis: clk_disable(pc->pwm_clk); + clk_disable(pc->cpt_clk); return ret; } @@ -246,6 +252,10 @@ static int sti_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) if (ret) goto out; + ret = clk_enable(pc->cpt_clk); + if (ret) + goto out; + ret = regmap_field_write(pc->pwm_out_en, 1); if (ret) { dev_err(dev, "failed to enable PWM device:%d\n", @@ -271,6 +281,7 @@ static void sti_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) regmap_field_write(pc->pwm_out_en, 0); clk_disable(pc->pwm_clk); + clk_disable(pc->cpt_clk); mutex_unlock(&pc->sti_pwm_lock); } @@ -390,6 +401,18 @@ static int sti_pwm_probe(struct platform_device *pdev) return ret; } + pc->cpt_clk = of_clk_get_by_name(dev->of_node, "capture"); + if (IS_ERR(pc->cpt_clk)) { + dev_err(dev, "failed to get PWM capture clock\n"); + return PTR_ERR(pc->cpt_clk); + } + + ret = clk_prepare(pc->cpt_clk); + if (ret) { + dev_err(dev, "failed to prepare clock\n"); + return ret; + } + pc->chip.dev = dev; pc->chip.ops = &sti_pwm_ops; pc->chip.base = -1; @@ -399,6 +422,7 @@ static int sti_pwm_probe(struct platform_device *pdev) ret = pwmchip_add(&pc->chip); if (ret < 0) { clk_unprepare(pc->pwm_clk); + clk_unprepare(pc->cpt_clk); return ret; } @@ -416,6 +440,7 @@ static int sti_pwm_remove(struct platform_device *pdev) pwm_disable(&pc->chip.pwms[i]); clk_unprepare(pc->pwm_clk); + clk_unprepare(pc->cpt_clk); return pwmchip_remove(&pc->chip); } |