linux-kernel - Re: [PATCH] leds/pca963x: implement power management

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Message-ID: <20240125132928.GI74950@google.com>
Date: Thu, 25 Jan 2024 13:29:28 +0000
From: Lee Jones <lee@...nel.org>
To: Amitesh Singh <singh.amitesh@...il.com>
Cc: pavel@....cz, linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds/pca963x: implement power management

On Tue, 16 Jan 2024, Amitesh Singh wrote:

> This implements power management in upstream driver

This *is* the upstream driver.  No need to mention that.

> for pca9633 which enables device sleep and resume
> on system-wide sleep/hibernation
> 
> Signed-off-by: Amitesh Singh <singh.amitesh@...il.com>
> ---
>  drivers/leds/leds-pca963x.c | 38 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
> 
> diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
> index 47223c850e4b..2474e40d8479 100644
> --- a/drivers/leds/leds-pca963x.c
> +++ b/drivers/leds/leds-pca963x.c
> @@ -39,6 +39,7 @@
>  #define PCA963X_LED_PWM		0x2	/* Controlled through PWM */
>  #define PCA963X_LED_GRP_PWM	0x3	/* Controlled through PWM/GRPPWM */
>  
> +#define PCA963X_MODE1_SLEEP     0x04    /* Normal mode or Low Power mode, oscillator off */
>  #define PCA963X_MODE2_OUTDRV	0x04	/* Open-drain or totem pole */
>  #define PCA963X_MODE2_INVRT	0x10	/* Normal or inverted direction */
>  #define PCA963X_MODE2_DMBLNK	0x20	/* Enable blinking */
> @@ -380,6 +381,42 @@ static int pca963x_register_leds(struct i2c_client *client,
>  	return ret;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int pca963x_suspend(struct device *dev)
> +{
> +	struct pca963x *chip;
> +	u8 reg;
> +
> +	chip = dev_get_drvdata(dev);

Do the assignment during declaration.

> +	reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);
> +	reg = reg | (1 << PCA963X_MODE1_SLEEP);

BIT()

> +	i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);
> +
> +	return 0;
> +}
> +
> +static int pca963x_resume(struct device *dev)
> +{
> +	struct pca963x *chip;
> +	u8 reg;
> +
> +	chip = dev_get_drvdata(dev);

As above.

> +	reg = i2c_smbus_read_byte_data(chip->client, PCA963X_MODE1);
> +	reg = reg & ~(1 << PCA963X_MODE1_SLEEP);

As above.

> +	i2c_smbus_write_byte_data(chip->client, PCA963X_MODE1, reg);
> +
> +	return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops pca963x_pmops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(pca963x_suspend, pca963x_resume)
> +};
> +

Remove this line.

> +static SIMPLE_DEV_PM_OPS(pca963x_pm, pca963x_suspend, pca963x_resume);
> +
>  static const struct of_device_id of_pca963x_match[] = {
>  	{ .compatible = "nxp,pca9632", },
>  	{ .compatible = "nxp,pca9633", },
> @@ -430,6 +467,7 @@ static struct i2c_driver pca963x_driver = {
>  	.driver = {
>  		.name	= "leds-pca963x",
>  		.of_match_table = of_pca963x_match,
> +		.pm = &pca963x_pmops
>  	},
>  	.probe = pca963x_probe,
>  	.id_table = pca963x_id,
> -- 
> 2.43.0
> 

-- 
Lee Jones [李琼斯]