linux-kernel - Re: [PATCH 02/12] pinctrl: basic Nomadik pinctrl interface

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Date:	Wed, 09 May 2012 14:34:51 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Linus Walleij <linus.walleij@...ricsson.com>
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Stephen Warren <swarren@...dia.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Rajendra Nayak <rajendra.nayak@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 02/12] pinctrl: basic Nomadik pinctrl interface

On 05/08/2012 03:44 AM, Linus Walleij wrote:
> From: Linus Walleij <linus.walleij@...aro.org>
> 
> This adds a scratch pin control interface to the Nomadik pinctrl
> driver, and defines the pins and groups in the DB8500 ASIC. We
> define GPIO ranges to cover the pins exposed. The DB8500 has
> more pins than this but we restrict the driver to the pins that
> can be controlled from the combined GPIO and pin control hardware
> to begin with.

> diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c

> +static int nmk_list_groups(struct pinctrl_dev *pctldev, unsigned selector)
> +{
> +	struct nmk_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
> +
> +	if (selector >= npct->soc->ngroups)
> +		return -EINVAL;

I think all the other drivers removed this error-checking from functions
called by the pinctrl core, assuming that the core would error-check any
user-supplied data and respect limits in the pinctrl device descriptor.

> +static int __devinit nmk_pinctrl_probe(struct platform_device *pdev)

> +	/* Poke in other ASIC variants here */
> +	if (platid->driver_data == PINCTRL_NMK_DB8500)
> +		nmk_pinctrl_db8500_init(&npct->soc);

Other platforms have a unique top-level driver for each variant, with
the probe() function for each variant calling into a utility function.
That way, the common/utility code doesn't need to contain a
table/list/... of all the variants. Can the same approach be used here?
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