| Message ID | 20190525181133.4875-8-martin.blumenstingl@googlemail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pwm-meson: cleanups and improvements | expand |
On 25/05/2019 20:11, Martin Blumenstingl wrote: > Make struct meson_pwm_channel accessible from struct meson_pwm. > > PWM core has a limitation: per-channel data can only be set after > pwmchip_add() is called. However, pwmchip_add() internally calls > pwm_ops.get_state(). If pwm_ops.get_state() needs access to the > per-channel data it has to obtain it from struct pwm_chip and struct > pwm_device's hwpwm information. > > Add a struct meson_pwm_channel for each PWM channel to struct meson_pwm > so the pwm_ops.get_state() callback can be implemented as it needs > access to the clock from struct meson_pwm_channel. > > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> > --- > drivers/pwm/pwm-meson.c | 25 ++++++++++--------------- > 1 file changed, 10 insertions(+), 15 deletions(-) > > diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c > index d6eb4d04d5c9..d1718f54ecec 100644 > --- a/drivers/pwm/pwm-meson.c > +++ b/drivers/pwm/pwm-meson.c > @@ -37,6 +37,8 @@ > #define MISC_B_EN BIT(1) > #define MISC_A_EN BIT(0) > > +#define MESON_NUM_PWMS 2 > + > static const unsigned int mux_reg_shifts[] = { > MISC_A_CLK_SEL_SHIFT, > MISC_B_CLK_SEL_SHIFT > @@ -62,6 +64,7 @@ struct meson_pwm_data { > struct meson_pwm { > struct pwm_chip chip; > const struct meson_pwm_data *data; > + struct meson_pwm_channel channels[MESON_NUM_PWMS]; > void __iomem *base; > /* > * Protects register (write) access to the REG_MISC_AB register > @@ -435,8 +438,7 @@ static const struct of_device_id meson_pwm_matches[] = { > }; > MODULE_DEVICE_TABLE(of, meson_pwm_matches); > > -static int meson_pwm_init_channels(struct meson_pwm *meson, > - struct meson_pwm_channel *channels) > +static int meson_pwm_init_channels(struct meson_pwm *meson) > { > struct device *dev = meson->chip.dev; > struct clk_init_data init; > @@ -445,7 +447,7 @@ static int meson_pwm_init_channels(struct meson_pwm *meson, > int err; > > for (i = 0; i < meson->chip.npwm; i++) { > - struct meson_pwm_channel *channel = &channels[i]; > + struct meson_pwm_channel *channel = &meson->channels[i]; > > snprintf(name, sizeof(name), "%s#mux%u", dev_name(dev), i); > > @@ -480,18 +482,16 @@ static int meson_pwm_init_channels(struct meson_pwm *meson, > return 0; > } > > -static void meson_pwm_add_channels(struct meson_pwm *meson, > - struct meson_pwm_channel *channels) > +static void meson_pwm_add_channels(struct meson_pwm *meson) > { > unsigned int i; > > for (i = 0; i < meson->chip.npwm; i++) > - pwm_set_chip_data(&meson->chip.pwms[i], &channels[i]); > + pwm_set_chip_data(&meson->chip.pwms[i], &meson->channels[i]); > } > > static int meson_pwm_probe(struct platform_device *pdev) > { > - struct meson_pwm_channel *channels; > struct meson_pwm *meson; > struct resource *regs; > int err; > @@ -509,18 +509,13 @@ static int meson_pwm_probe(struct platform_device *pdev) > meson->chip.dev = &pdev->dev; > meson->chip.ops = &meson_pwm_ops; > meson->chip.base = -1; > - meson->chip.npwm = 2; > + meson->chip.npwm = MESON_NUM_PWM; > meson->chip.of_xlate = of_pwm_xlate_with_flags; > meson->chip.of_pwm_n_cells = 3; > > meson->data = of_device_get_match_data(&pdev->dev); > > - channels = devm_kcalloc(&pdev->dev, meson->chip.npwm, > - sizeof(*channels), GFP_KERNEL); > - if (!channels) > - return -ENOMEM; > - > - err = meson_pwm_init_channels(meson, channels); > + err = meson_pwm_init_channels(meson); > if (err < 0) > return err; > > @@ -530,7 +525,7 @@ static int meson_pwm_probe(struct platform_device *pdev) > return err; > } > > - meson_pwm_add_channels(meson, channels); > + meson_pwm_add_channels(meson); > > platform_set_drvdata(pdev, meson); > > Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
On Sat, May 25, 2019 at 8:11 PM Martin Blumenstingl <martin.blumenstingl@googlemail.com> wrote: [...] > @@ -509,18 +509,13 @@ static int meson_pwm_probe(struct platform_device *pdev) > meson->chip.dev = &pdev->dev; > meson->chip.ops = &meson_pwm_ops; > meson->chip.base = -1; > - meson->chip.npwm = 2; > + meson->chip.npwm = MESON_NUM_PWM; I messed this up during rebase, the macro name is actually MESON_NUM_PWMS I'll re-send a fix so these patches can be bisected cleanly (patch 8 fixes this typo accidentally)
diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index d6eb4d04d5c9..d1718f54ecec 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -37,6 +37,8 @@ #define MISC_B_EN BIT(1) #define MISC_A_EN BIT(0) +#define MESON_NUM_PWMS 2 + static const unsigned int mux_reg_shifts[] = { MISC_A_CLK_SEL_SHIFT, MISC_B_CLK_SEL_SHIFT @@ -62,6 +64,7 @@ struct meson_pwm_data { struct meson_pwm { struct pwm_chip chip; const struct meson_pwm_data *data; + struct meson_pwm_channel channels[MESON_NUM_PWMS]; void __iomem *base; /* * Protects register (write) access to the REG_MISC_AB register @@ -435,8 +438,7 @@ static const struct of_device_id meson_pwm_matches[] = { }; MODULE_DEVICE_TABLE(of, meson_pwm_matches); -static int meson_pwm_init_channels(struct meson_pwm *meson, - struct meson_pwm_channel *channels) +static int meson_pwm_init_channels(struct meson_pwm *meson) { struct device *dev = meson->chip.dev; struct clk_init_data init; @@ -445,7 +447,7 @@ static int meson_pwm_init_channels(struct meson_pwm *meson, int err; for (i = 0; i < meson->chip.npwm; i++) { - struct meson_pwm_channel *channel = &channels[i]; + struct meson_pwm_channel *channel = &meson->channels[i]; snprintf(name, sizeof(name), "%s#mux%u", dev_name(dev), i); @@ -480,18 +482,16 @@ static int meson_pwm_init_channels(struct meson_pwm *meson, return 0; } -static void meson_pwm_add_channels(struct meson_pwm *meson, - struct meson_pwm_channel *channels) +static void meson_pwm_add_channels(struct meson_pwm *meson) { unsigned int i; for (i = 0; i < meson->chip.npwm; i++) - pwm_set_chip_data(&meson->chip.pwms[i], &channels[i]); + pwm_set_chip_data(&meson->chip.pwms[i], &meson->channels[i]); } static int meson_pwm_probe(struct platform_device *pdev) { - struct meson_pwm_channel *channels; struct meson_pwm *meson; struct resource *regs; int err; @@ -509,18 +509,13 @@ static int meson_pwm_probe(struct platform_device *pdev) meson->chip.dev = &pdev->dev; meson->chip.ops = &meson_pwm_ops; meson->chip.base = -1; - meson->chip.npwm = 2; + meson->chip.npwm = MESON_NUM_PWM; meson->chip.of_xlate = of_pwm_xlate_with_flags; meson->chip.of_pwm_n_cells = 3; meson->data = of_device_get_match_data(&pdev->dev); - channels = devm_kcalloc(&pdev->dev, meson->chip.npwm, - sizeof(*channels), GFP_KERNEL); - if (!channels) - return -ENOMEM; - - err = meson_pwm_init_channels(meson, channels); + err = meson_pwm_init_channels(meson); if (err < 0) return err; @@ -530,7 +525,7 @@ static int meson_pwm_probe(struct platform_device *pdev) return err; } - meson_pwm_add_channels(meson, channels); + meson_pwm_add_channels(meson); platform_set_drvdata(pdev, meson);
Make struct meson_pwm_channel accessible from struct meson_pwm. PWM core has a limitation: per-channel data can only be set after pwmchip_add() is called. However, pwmchip_add() internally calls pwm_ops.get_state(). If pwm_ops.get_state() needs access to the per-channel data it has to obtain it from struct pwm_chip and struct pwm_device's hwpwm information. Add a struct meson_pwm_channel for each PWM channel to struct meson_pwm so the pwm_ops.get_state() callback can be implemented as it needs access to the clock from struct meson_pwm_channel. Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> --- drivers/pwm/pwm-meson.c | 25 ++++++++++--------------- 1 file changed, 10 insertions(+), 15 deletions(-)