[0/2] Add PWM support to EN7581

Introduce driver for PWM module available on EN7581 SoC.

Benjamin Larsson (1):
  pwm: airoha: Add support for EN7581 SoC

Christian Marangi (1):
  dt-bindings: pwm: Document Airoha EN7581 PWM

 .../bindings/pwm/airoha,en7581-pwm.yaml       |  42 ++
 drivers/pwm/Kconfig                           |  10 +
 drivers/pwm/Makefile                          |   1 +
 drivers/pwm/pwm-airoha.c                      | 403 ++++++++++++++++++
 4 files changed, 456 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/airoha,en7581-pwm.yaml
 create mode 100644 drivers/pwm/pwm-airoha.c

On 10/08/2024 06:48, Lorenzo Bianconi wrote:
> From: Benjamin Larsson <benjamin.larsson@genexis.eu>
> 
> Introduce driver for PWM module available on EN7581 SoC.
> 
> Signed-off-by: Benjamin Larsson <benjamin.larsson@genexis.eu>
> Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---


...

> +
> +static void airoha_pwm_config_flash_map(struct airoha_pwm *pc,
> +					unsigned int hwpwm, int index)
> +{
> +	u32 addr, mask, val;
> +
> +	if (hwpwm < PWM_NUM_GPIO) {
> +		addr = REG_GPIO_FLASH_MAP(hwpwm / 8);
> +	} else {
> +		addr = REG_SIPO_FLASH_MAP(hwpwm / 8);
> +		hwpwm -= PWM_NUM_GPIO;
> +	}
> +
> +	if (index < 0) {
> +		/* Change of waveform takes effect immediately but

This and other comments should be not netdev-style but general Linux style.

> +		 * disabling has some delay so to prevent glitching
> +		 * only the enable bit is touched when disabling
> +		 */
> +		airoha_pwm_flash_clear(pc, addr, GPIO_FLASH_EN(hwpwm % 8));
> +		return;

...


> +
> +static const struct of_device_id airoha_pwm_of_match[] = {
> +	{ .compatible = "airoha,en7581-pwm" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, airoha_pwm_of_match);
> +
> +static struct platform_driver airoha_pwm_driver = {
> +	.driver = {
> +		.name = "airoha-pwm",
> +		.of_match_table = airoha_pwm_of_match,
> +	},
> +	.probe = airoha_pwm_probe,
> +};
> +module_platform_driver(airoha_pwm_driver);
> +
> +MODULE_ALIAS("platform:airoha-pwm");

You should not need MODULE_ALIAS() in normal cases. If you need it,
usually it means your device ID table is wrong (e.g. misses either
entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute
for incomplete ID table.

Especially that it does not match compatible, so you cannot use excuse
module autoloading does not work for given OF node...


Best regards,
Krzysztof

> On 10/08/2024 06:48, Lorenzo Bianconi wrote:
> > From: Benjamin Larsson <benjamin.larsson@genexis.eu>
> > 
> > Introduce driver for PWM module available on EN7581 SoC.
> > 
> > Signed-off-by: Benjamin Larsson <benjamin.larsson@genexis.eu>
> > Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> > ---
> 
> 
> ...
> 
> > +
> > +static void airoha_pwm_config_flash_map(struct airoha_pwm *pc,
> > +					unsigned int hwpwm, int index)
> > +{
> > +	u32 addr, mask, val;
> > +
> > +	if (hwpwm < PWM_NUM_GPIO) {
> > +		addr = REG_GPIO_FLASH_MAP(hwpwm / 8);
> > +	} else {
> > +		addr = REG_SIPO_FLASH_MAP(hwpwm / 8);
> > +		hwpwm -= PWM_NUM_GPIO;
> > +	}
> > +
> > +	if (index < 0) {
> > +		/* Change of waveform takes effect immediately but
> 
> This and other comments should be not netdev-style but general Linux style.

ack, I will fix them in v2.

> 
> > +		 * disabling has some delay so to prevent glitching
> > +		 * only the enable bit is touched when disabling
> > +		 */
> > +		airoha_pwm_flash_clear(pc, addr, GPIO_FLASH_EN(hwpwm % 8));
> > +		return;
> 
> ...
> 
> 
> > +
> > +static const struct of_device_id airoha_pwm_of_match[] = {
> > +	{ .compatible = "airoha,en7581-pwm" },
> > +	{ /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, airoha_pwm_of_match);
> > +
> > +static struct platform_driver airoha_pwm_driver = {
> > +	.driver = {
> > +		.name = "airoha-pwm",
> > +		.of_match_table = airoha_pwm_of_match,
> > +	},
> > +	.probe = airoha_pwm_probe,
> > +};
> > +module_platform_driver(airoha_pwm_driver);
> > +
> > +MODULE_ALIAS("platform:airoha-pwm");
> 
> You should not need MODULE_ALIAS() in normal cases. If you need it,
> usually it means your device ID table is wrong (e.g. misses either
> entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute
> for incomplete ID table.
> 
> Especially that it does not match compatible, so you cannot use excuse
> module autoloading does not work for given OF node...

ack, I will fix it in v2.

Regards,
Lorenzo

> 
> 
> Best regards,
> Krzysztof
>