Re: [PATCH v3 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation
On 2016-11-01 00:10, Lukasz Majewski wrote:
> The code has been rewritten to remove "generic" calls to
> imx_pwm_{enable|disable|config}.
>
> Such approach would facilitate switch to atomic PWM (a.k.a ->apply())
> implementation.
>
> Suggested-by: Stefan Agner
> Suggested-by: Boris Brezillon
> Signed-off-by: Lukasz Majewski
> ---
> Changes for v3:
> - Remove ipg clock
>
> Changes for v2:
> - Add missing clock unprepare for clk_ipg
> - Enable peripheral PWM clock (clk_per)
> ---
> drivers/pwm/pwm-imx.c | 36
> 1 file changed, 24 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
> index d594501..8497902 100644
> --- a/drivers/pwm/pwm-imx.c
> +++ b/drivers/pwm/pwm-imx.c
> @@ -64,8 +64,6 @@ struct imx_chip {
> static int imx_pwm_config_v1(struct pwm_chip *chip,
> struct pwm_device *pwm, int duty_ns, int period_ns)
> {
> - struct imx_chip *imx = to_imx_chip(chip);
> -
> /*
>* The PWM subsystem allows for exact frequencies. However,
>* I cannot connect a scope on my device to the PWM line and
> @@ -83,6 +81,7 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
>* both the prescaler (/1 .. /128) and then by CLKSEL
>* (/2 .. /16).
>*/
> + struct imx_chip *imx = to_imx_chip(chip);
This change is unnecessary.
It is also common to have declarations at the beginning of the function
and separated with a newline from code.
But otherwise looks good to me:
Reviewed-by: Stefan Agner
--
Stefan
> u32 max = readl(imx->mmio_base + MX1_PWMP);
> u32 p = max * duty_ns / period_ns;
> writel(max - p, imx->mmio_base + MX1_PWMS);
> @@ -90,19 +89,34 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
> return 0;
> }
>
> -static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable)
> +static int imx_pwm_enable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
> {
> struct imx_chip *imx = to_imx_chip(chip);
> + int ret;
> u32 val;
>
> + ret = clk_prepare_enable(imx->clk_per);
> + if (ret)
> + return ret;
> +
> val = readl(imx->mmio_base + MX1_PWMC);
> + val |= MX1_PWMC_EN;
> + writel(val, imx->mmio_base + MX1_PWMC);
>
> - if (enable)
> - val |= MX1_PWMC_EN;
> - else
> - val &= ~MX1_PWMC_EN;
> + return 0;
> +}
> +
> +static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + struct imx_chip *imx = to_imx_chip(chip);
> + u32 val;
> +
> + val = readl(imx->mmio_base + MX1_PWMC);
> + val &= ~MX1_PWMC_EN;
>
> writel(val, imx->mmio_base + MX1_PWMC);
> +
> + clk_disable_unprepare(imx->clk_per);
> }
>
> static int imx_pwm_config_v2(struct pwm_chip *chip,
> @@ -231,9 +245,9 @@ static void imx_pwm_disable(struct pwm_chip *chip,
> struct pwm_device *pwm)
> }
>
> static struct pwm_ops imx_pwm_ops_v1 = {
> - .enable = imx_pwm_enable,
> - .disable = imx_pwm_disable,
> - .config = imx_pwm_config,
> + .enable = imx_pwm_enable_v1,
> + .disable = imx_pwm_disable_v1,
> + .config = imx_pwm_config_v1,
> .owner = THIS_MODULE,
> };
>
> @@ -252,8 +266,6 @@ struct imx_pwm_data {
> };
>
> static struct imx_pwm_data imx_pwm_data_v1 = {
> - .config = imx_pwm_config_v1,
> - .set_enable = imx_pwm_set_enable_v1,
> .pwm_ops = _pwm_ops_v1,
> };
Re: [PATCH v3 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation
On 2016-11-01 00:10, Lukasz Majewski wrote:
> The code has been rewritten to remove "generic" calls to
> imx_pwm_{enable|disable|config}.
>
> Such approach would facilitate switch to atomic PWM (a.k.a ->apply())
> implementation.
>
> Suggested-by: Stefan Agner
> Suggested-by: Boris Brezillon
> Signed-off-by: Lukasz Majewski
> ---
> Changes for v3:
> - Remove ipg clock
>
> Changes for v2:
> - Add missing clock unprepare for clk_ipg
> - Enable peripheral PWM clock (clk_per)
> ---
> drivers/pwm/pwm-imx.c | 36
> 1 file changed, 24 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
> index d594501..8497902 100644
> --- a/drivers/pwm/pwm-imx.c
> +++ b/drivers/pwm/pwm-imx.c
> @@ -64,8 +64,6 @@ struct imx_chip {
> static int imx_pwm_config_v1(struct pwm_chip *chip,
> struct pwm_device *pwm, int duty_ns, int period_ns)
> {
> - struct imx_chip *imx = to_imx_chip(chip);
> -
> /*
>* The PWM subsystem allows for exact frequencies. However,
>* I cannot connect a scope on my device to the PWM line and
> @@ -83,6 +81,7 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
>* both the prescaler (/1 .. /128) and then by CLKSEL
>* (/2 .. /16).
>*/
> + struct imx_chip *imx = to_imx_chip(chip);
This change is unnecessary.
It is also common to have declarations at the beginning of the function
and separated with a newline from code.
But otherwise looks good to me:
Reviewed-by: Stefan Agner
--
Stefan
> u32 max = readl(imx->mmio_base + MX1_PWMP);
> u32 p = max * duty_ns / period_ns;
> writel(max - p, imx->mmio_base + MX1_PWMS);
> @@ -90,19 +89,34 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
> return 0;
> }
>
> -static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable)
> +static int imx_pwm_enable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
> {
> struct imx_chip *imx = to_imx_chip(chip);
> + int ret;
> u32 val;
>
> + ret = clk_prepare_enable(imx->clk_per);
> + if (ret)
> + return ret;
> +
> val = readl(imx->mmio_base + MX1_PWMC);
> + val |= MX1_PWMC_EN;
> + writel(val, imx->mmio_base + MX1_PWMC);
>
> - if (enable)
> - val |= MX1_PWMC_EN;
> - else
> - val &= ~MX1_PWMC_EN;
> + return 0;
> +}
> +
> +static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> + struct imx_chip *imx = to_imx_chip(chip);
> + u32 val;
> +
> + val = readl(imx->mmio_base + MX1_PWMC);
> + val &= ~MX1_PWMC_EN;
>
> writel(val, imx->mmio_base + MX1_PWMC);
> +
> + clk_disable_unprepare(imx->clk_per);
> }
>
> static int imx_pwm_config_v2(struct pwm_chip *chip,
> @@ -231,9 +245,9 @@ static void imx_pwm_disable(struct pwm_chip *chip,
> struct pwm_device *pwm)
> }
>
> static struct pwm_ops imx_pwm_ops_v1 = {
> - .enable = imx_pwm_enable,
> - .disable = imx_pwm_disable,
> - .config = imx_pwm_config,
> + .enable = imx_pwm_enable_v1,
> + .disable = imx_pwm_disable_v1,
> + .config = imx_pwm_config_v1,
> .owner = THIS_MODULE,
> };
>
> @@ -252,8 +266,6 @@ struct imx_pwm_data {
> };
>
> static struct imx_pwm_data imx_pwm_data_v1 = {
> - .config = imx_pwm_config_v1,
> - .set_enable = imx_pwm_set_enable_v1,
> .pwm_ops = _pwm_ops_v1,
> };
[PATCH v3 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation
The code has been rewritten to remove "generic" calls to
imx_pwm_{enable|disable|config}.
Such approach would facilitate switch to atomic PWM (a.k.a ->apply())
implementation.
Suggested-by: Stefan Agner
Suggested-by: Boris Brezillon
Signed-off-by: Lukasz Majewski
---
Changes for v3:
- Remove ipg clock
Changes for v2:
- Add missing clock unprepare for clk_ipg
- Enable peripheral PWM clock (clk_per)
---
drivers/pwm/pwm-imx.c | 36
1 file changed, 24 insertions(+), 12 deletions(-)
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index d594501..8497902 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -64,8 +64,6 @@ struct imx_chip {
static int imx_pwm_config_v1(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
- struct imx_chip *imx = to_imx_chip(chip);
-
/*
* The PWM subsystem allows for exact frequencies. However,
* I cannot connect a scope on my device to the PWM line and
@@ -83,6 +81,7 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
* both the prescaler (/1 .. /128) and then by CLKSEL
* (/2 .. /16).
*/
+ struct imx_chip *imx = to_imx_chip(chip);
u32 max = readl(imx->mmio_base + MX1_PWMP);
u32 p = max * duty_ns / period_ns;
writel(max - p, imx->mmio_base + MX1_PWMS);
@@ -90,19 +89,34 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
return 0;
}
-static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable)
+static int imx_pwm_enable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct imx_chip *imx = to_imx_chip(chip);
+ int ret;
u32 val;
+ ret = clk_prepare_enable(imx->clk_per);
+ if (ret)
+ return ret;
+
val = readl(imx->mmio_base + MX1_PWMC);
+ val |= MX1_PWMC_EN;
+ writel(val, imx->mmio_base + MX1_PWMC);
- if (enable)
- val |= MX1_PWMC_EN;
- else
- val &= ~MX1_PWMC_EN;
+ return 0;
+}
+
+static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct imx_chip *imx = to_imx_chip(chip);
+ u32 val;
+
+ val = readl(imx->mmio_base + MX1_PWMC);
+ val &= ~MX1_PWMC_EN;
writel(val, imx->mmio_base + MX1_PWMC);
+
+ clk_disable_unprepare(imx->clk_per);
}
static int imx_pwm_config_v2(struct pwm_chip *chip,
@@ -231,9 +245,9 @@ static void imx_pwm_disable(struct pwm_chip *chip, struct
pwm_device *pwm)
}
static struct pwm_ops imx_pwm_ops_v1 = {
- .enable = imx_pwm_enable,
- .disable = imx_pwm_disable,
- .config = imx_pwm_config,
+ .enable = imx_pwm_enable_v1,
+ .disable = imx_pwm_disable_v1,
+ .config = imx_pwm_config_v1,
.owner = THIS_MODULE,
};
@@ -252,8 +266,6 @@ struct imx_pwm_data {
};
static struct imx_pwm_data imx_pwm_data_v1 = {
- .config = imx_pwm_config_v1,
- .set_enable = imx_pwm_set_enable_v1,
.pwm_ops = _pwm_ops_v1,
};
--
2.1.4
[PATCH v3 04/11] pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm operation
The code has been rewritten to remove "generic" calls to
imx_pwm_{enable|disable|config}.
Such approach would facilitate switch to atomic PWM (a.k.a ->apply())
implementation.
Suggested-by: Stefan Agner
Suggested-by: Boris Brezillon
Signed-off-by: Lukasz Majewski
---
Changes for v3:
- Remove ipg clock
Changes for v2:
- Add missing clock unprepare for clk_ipg
- Enable peripheral PWM clock (clk_per)
---
drivers/pwm/pwm-imx.c | 36
1 file changed, 24 insertions(+), 12 deletions(-)
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index d594501..8497902 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -64,8 +64,6 @@ struct imx_chip {
static int imx_pwm_config_v1(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
- struct imx_chip *imx = to_imx_chip(chip);
-
/*
* The PWM subsystem allows for exact frequencies. However,
* I cannot connect a scope on my device to the PWM line and
@@ -83,6 +81,7 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
* both the prescaler (/1 .. /128) and then by CLKSEL
* (/2 .. /16).
*/
+ struct imx_chip *imx = to_imx_chip(chip);
u32 max = readl(imx->mmio_base + MX1_PWMP);
u32 p = max * duty_ns / period_ns;
writel(max - p, imx->mmio_base + MX1_PWMS);
@@ -90,19 +89,34 @@ static int imx_pwm_config_v1(struct pwm_chip *chip,
return 0;
}
-static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable)
+static int imx_pwm_enable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct imx_chip *imx = to_imx_chip(chip);
+ int ret;
u32 val;
+ ret = clk_prepare_enable(imx->clk_per);
+ if (ret)
+ return ret;
+
val = readl(imx->mmio_base + MX1_PWMC);
+ val |= MX1_PWMC_EN;
+ writel(val, imx->mmio_base + MX1_PWMC);
- if (enable)
- val |= MX1_PWMC_EN;
- else
- val &= ~MX1_PWMC_EN;
+ return 0;
+}
+
+static void imx_pwm_disable_v1(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct imx_chip *imx = to_imx_chip(chip);
+ u32 val;
+
+ val = readl(imx->mmio_base + MX1_PWMC);
+ val &= ~MX1_PWMC_EN;
writel(val, imx->mmio_base + MX1_PWMC);
+
+ clk_disable_unprepare(imx->clk_per);
}
static int imx_pwm_config_v2(struct pwm_chip *chip,
@@ -231,9 +245,9 @@ static void imx_pwm_disable(struct pwm_chip *chip, struct
pwm_device *pwm)
}
static struct pwm_ops imx_pwm_ops_v1 = {
- .enable = imx_pwm_enable,
- .disable = imx_pwm_disable,
- .config = imx_pwm_config,
+ .enable = imx_pwm_enable_v1,
+ .disable = imx_pwm_disable_v1,
+ .config = imx_pwm_config_v1,
.owner = THIS_MODULE,
};
@@ -252,8 +266,6 @@ struct imx_pwm_data {
};
static struct imx_pwm_data imx_pwm_data_v1 = {
- .config = imx_pwm_config_v1,
- .set_enable = imx_pwm_set_enable_v1,
.pwm_ops = _pwm_ops_v1,
};
--
2.1.4
