| Message ID | 1461320295-20414-8-git-send-email-lee.jones@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Lee, On Fri, 22 Apr 2016, Lee Jones wrote: > 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> > --- > drivers/pwm/pwm-sti.c | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c > index 2f61e1e..78979d0 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); > + } The dt binding document pwm-st.txt also needs updating for this extra clock. regards, Peter.
diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index 2f61e1e..78979d0 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); }
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> --- drivers/pwm/pwm-sti.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)