linux-kernel - Re: [PATCH 1/6 v11] ARM: Add basic architecture support for VIA/WonderMedia 85xx SoC's

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Message-ID: <4D1282DA.4020804@bluewatersys.com>
Date:	Thu, 23 Dec 2010 11:59:38 +1300
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Alexey Charkov <alchark@...il.com>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	vt8500-wm8505-linux-kernel@...glegroups.com,
	Eric Miao <eric.y.miao@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6 v11] ARM: Add basic architecture support for VIA/WonderMedia
 85xx SoC's

On 12/23/2010 11:25 AM, Alexey Charkov wrote:
> This adds support for the family of Systems-on-Chip produced initially
> by VIA and now its subsidiary WonderMedia that have recently become
> widespread in lower-end Chinese ARM-based tablets and netbooks.
> 
> Support is included for both VT8500 and WM8505, selectable by a
> configuration switch at kernel build time.
> 
> Included are basic machine initialization files, register and
> interrupt definitions, support for the on-chip interrupt controller,
> high-precision OS timer, GPIO lines, necessary macros for early debug,
> pulse-width-modulated outputs control, as well as platform device
> configurations for the specific drivers implemented elsewhere.
> 
> Signed-off-by: Alexey Charkov <alchark@...il.com>
> ---
> 
> This incorporates latest comments by Ryan regarding helper inlines
> in devices-{vt8500,wm8505}.c
> 
> Best regards,
> Alexey

One final nitpick :-).

> +static int vt8500_muxed_gpio_direction_input(struct gpio_chip *chip,
> +				       unsigned offset)
> +{
> +	struct vt8500_gpio_chip *vt8500_chip = to_vt8500(chip);
> +	unsigned val = readl(regbase + 0x20 + vt8500_chip->regoff);
> +
> +	val &= ~(1 << vt8500_chip->shift << offset);
> +	writel(val, regbase + 0x20 + vt8500_chip->regoff);

The magic numbers (0x20) in the gpio functions should probably be
#defined as register names. I'm guessing this is the input enable
register? Often people do helper functions for this, i.e:

static inline void gpio_write_reg(struct vt8500_gpio_chip *chip,
				  unsigned val, unsigned reg)
{
	writel(val, regbase + chip->regoff + reg);
}

Other than that, looks good.

Reviewed-by: Ryan Mallon <ryan@...ewatersys.com>

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