linux-kernel - Re: [PATCH v2 2/2] leds: leds-multi-gpio: Add multiple GPIOs LED driver

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Date:   Fri, 26 Mar 2021 14:49:39 +0100
From:   Pavel Machek <pavel@....cz>
To:     Hermes Zhang <chenhui.zhang@...s.com>
Cc:     dmurphy@...com, robh+dt@...nel.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        chenhuiz@...s.com, lkml@...s.com, kernel@...s.com
Subject: Re: [PATCH v2 2/2] leds: leds-multi-gpio: Add multiple GPIOs LED
 driver

Hi!

> Introduce a new multiple GPIOs LED driver. This LED will made of
> multiple GPIOs (up to 8) and will map different brightness to different
> GPIOs states which defined in dts file.
> 
> Signed-off-by: Hermes Zhang <chenhuiz@...s.com>


> index 000000000000..7aef82701f86
> --- /dev/null
> +++ b/drivers/leds/simple/Kconfig
> @@ -0,0 +1,23 @@
> +menuconfig LEDS_SIMPLE
> +	bool "Simple LED support"
> +	depends on LEDS_CLASS
> +	help
> +	  This option enables simple leds support for the leds class.
> +	  If unsure, say Y.

No need for new config symbol.

> +	if (ret != 1 << gpios->ndescs) {

I'd do (ret != (1 << gpios->ndescs))

> +	priv = devm_kzalloc(dev, sizeof(struct multi_gpio_led_priv)
> +			+ sizeof(u8) * nr_states , GFP_KERNEL);

Sizeof(u8) is always 1, no need for space before , . 

> +	of_property_read_string(node, "default-state", &state);
> +	if (!strcmp(state, "on"))
> +		multi_gpio_led_set(&priv->cdev, priv->cdev.max_brightness);
> +	else
> +		multi_gpio_led_set(&priv->cdev, 0);

No need for default-state handling, unless you are using it.

Best regards,
									Pavel

-- 
http://www.livejournal.com/~pavelmachek

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