linux-kernel - Re: [PATCH v4 2/2] leds: bd2606mvv: Driver for the Rohm 6 Channel i2c LED driver

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Date:   Fri, 14 Apr 2023 14:18:56 +0200
From:   Pavel Machek <pavel@....cz>
To:     Andreas Kemnade <andreas@...nade.info>
Cc:     lee@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matti Vaittinen <mazziesaccount@...il.com>
Subject: Re: [PATCH v4 2/2] leds: bd2606mvv: Driver for the Rohm 6 Channel
 i2c LED driver

Hi!

> The device provides 6 channels which can be individually
> turned off and on but groups of two channels share a common brightness
> register.

Yeah, well.. Turn it into 3-channel controller with brightness or
6-channel on/off one... You can't really share brightness.

> +++ b/drivers/leds/Kconfig
> @@ -551,6 +551,17 @@ config LEDS_REGULATOR
>  	help
>  	  This option enables support for regulator driven LEDs.
>  
> +config LEDS_BD2606MVV
> +	tristate "LED driver for BD2606MVV"
> +	depends on LEDS_CLASS
> +	depends on I2C
> +	select REGMAP_I2C
> +	help
> +	  This option enables support for BD2606MVV LED driver chips
> +	  accessed via the I2C bus. It supports setting brightness, with
> +	  the limitiation that there are groups of two channels sharing
> +	  a brightness setting, but not the on/off setting.
> +

This driver can be used as a module...


> +static int
> +bd2606mvv_brightness_set(struct led_classdev *led_cdev,
> +		      enum led_brightness brightness)
> +{
> +	struct bd2606mvv_led *led = ldev_to_led(led_cdev);
> +	struct bd2606mvv_priv *priv = led->priv;
> +	int err;
> +
> +	if (brightness == 0)
> +		return regmap_update_bits(priv->regmap,
> +					  BD2606_REG_PWRCNT,
> +					  1 << led->led_no,
> +					  0);
> +
> +	/* shared brightness register */
> +	err = regmap_write(priv->regmap, led->led_no / 2,
> +			   brightness);
> +	if (err)
> +		return err;

Yeah. No.

Best regards,
							Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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