linux-kernel - Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support

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Date:   Wed, 25 Apr 2018 19:15:45 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Javier Arteaga <javier@...tex.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     Dan O'Donovan <dan@...tex.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH RESEND 2/3] leds: upboard: Add LED support

On Sat, 2018-04-21 at 09:50 +0100, Javier Arteaga wrote:
> Allow userspace to use the on-board LEDs as "upboard:<color>:".

> +	struct upboard_led *led = container_of(cdev, struct
> upboard_led, cdev);

#define to_upboard_led(cdev) container_of(cdev, struct upboard_led,
cdev)

... led = to_upboard_led(cdev);

> +	struct upboard_led *led = container_of(cdev, struct
> upboard_led, cdev);

Ditto.

> +static int __init upboard_led_probe(struct platform_device *pdev)

Are you sure about __init here?

> +	struct upboard_led_data * const pdata = pdev-
> >dev.platform_data;

Don't use direct dereference to platform_data.

> +	if (!pdev->dev.parent)
> +		return -EINVAL;
> +
> +	upboard = dev_get_drvdata(pdev->dev.parent);
> +	if (!upboard || !pdata)
> +		return -EINVAL;

Wouldn't be better to supply regmap as part of platform data?
It will allow be flexible of parent device.

> +MODULE_LICENSE("GPL");

License mismatch.

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy