linux-kernel - Re: [PATCH v2] leds-pca963x: add bindings to invert polarity

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Date:   Thu, 27 Apr 2017 21:01:35 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Anders Darander <anders@...rgestorm.se>, pavel@....cz,
        robh+dt@...nel.org, mark.rutland@....com,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     rpurdie@...ys.net
Subject: Re: [PATCH v2] leds-pca963x: add bindings to invert polarity

Hi Anders,

On 04/27/2017 08:37 AM, Anders Darander wrote:
> Add a new DT property, nxp,inverted-out, to invert the polarity of the output.
> 
> Tested on PCA9634.
> 
> Signed-off-by: Anders Darander <anders@...rgestorm.se>
> ---
>  Documentation/devicetree/bindings/leds/pca963x.txt |  1 +
>  drivers/leds/leds-pca963x.c                        | 17 +++++++++++++++--
>  include/linux/platform_data/leds-pca963x.h         |  6 ++++++
>  3 files changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/leds/pca963x.txt b/Documentation/devicetree/bindings/leds/pca963x.txt
> index dfbdb123a9bf..4eee41482041 100644
> --- a/Documentation/devicetree/bindings/leds/pca963x.txt
> +++ b/Documentation/devicetree/bindings/leds/pca963x.txt
> @@ -10,6 +10,7 @@ Optional properties:
>  - nxp,period-scale : In some configurations, the chip blinks faster than expected.
>  		     This parameter provides a scaling ratio (fixed point, decimal divided
>  		     by 1000) to compensate, e.g. 1300=1.3x and 750=0.75x.
> +- nxp,inverted-out: invert the polarity of the generated PWM
>  
>  Each led is represented as a sub-node of the nxp,pca963x device.
>  
> diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
> index ded1e4dac36a..3bf9a1271819 100644
> --- a/drivers/leds/leds-pca963x.c
> +++ b/drivers/leds/leds-pca963x.c
> @@ -342,6 +342,12 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
>  	if (of_property_read_u32(np, "nxp,period-scale", &chip->scaling))
>  		chip->scaling = 1000;
>  
> +	/* default to non-inverted output, unless inverted is specified */
> +	if (of_property_read_bool(np, "nxp,inverted-out"))
> +		pdata->dir = PCA963X_INVERTED;
> +	else
> +		pdata->dir = PCA963X_NORMAL;
> +
>  	return pdata;
>  }
>  
> @@ -452,11 +458,18 @@ static int pca963x_probe(struct i2c_client *client,
>  	i2c_smbus_write_byte_data(client, PCA963X_MODE1, BIT(4));
>  
>  	if (pdata) {
> +		u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
> +						    PCA963X_MODE2);
>  		/* Configure output: open-drain or totem pole (push-pull) */
>  		if (pdata->outdrv == PCA963X_OPEN_DRAIN)
> -			i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01);
> +			mode2 |= 0x01;
>  		else
> -			i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x05);
> +			mode2 |= 0x05;
> +		/* Configure direction: normal or inverted */
> +		if (pdata->dir == PCA963X_INVERTED)
> +			mode2 |= 0x10;
> +		i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
> +					  mode2);
>  	}
>  
>  	return 0;
> diff --git a/include/linux/platform_data/leds-pca963x.h b/include/linux/platform_data/leds-pca963x.h
> index e731f0036329..54e845ffb5ed 100644
> --- a/include/linux/platform_data/leds-pca963x.h
> +++ b/include/linux/platform_data/leds-pca963x.h
> @@ -33,10 +33,16 @@ enum pca963x_blink_type {
>  	PCA963X_HW_BLINK,
>  };
>  
> +enum pca963x_direction {
> +	PCA963X_NORMAL,
> +	PCA963X_INVERTED,
> +};
> +
>  struct pca963x_platform_data {
>  	struct led_platform_data leds;
>  	enum pca963x_outdrv outdrv;
>  	enum pca963x_blink_type blink_type;
> +	enum pca963x_direction dir;
>  };
>  
>  #endif /* __LINUX_PCA963X_H*/
> 

Thanks for the patch.

Applied to the for-4.13 branch of linux-leds.git.

-- 
Best regards,
Jacek Anaszewski