diff mbox series

[07/14] pwm: meson: add the meson_pwm_channel data to struct meson_pwm

Message ID 20190525181133.4875-8-martin.blumenstingl@googlemail.com
State Changes Requested
Headers show
Series pwm-meson: cleanups and improvements | expand

Commit Message

Martin Blumenstingl May 25, 2019, 6:11 p.m. UTC
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(-)

Comments

Neil Armstrong May 27, 2019, 12:27 p.m. UTC | #1
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>
Martin Blumenstingl May 27, 2019, 5:52 p.m. UTC | #2
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 mbox series

Patch

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);