linux-kernel - Re: [PATCH v3 2/9] pinctrl: mvebu: dove pinctrl driver

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Message-ID: <504FB8BA.1010703@wwwdotorg.org>
Date:	Tue, 11 Sep 2012 16:18:34 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/9] pinctrl: mvebu: dove pinctrl driver

On 09/10/2012 02:39 AM, Sebastian Hesselbarth wrote:
> This patch adds a SoC specific pinctrl driver for Marvell Dove SoCs
> plus DT binding documentation. This driver will use the mvebu pinctrl
> driver core.

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

> +static int dove_mpp4_ctrl_get(struct mvebu_mpp_ctrl *ctrl,
> +			      unsigned long *config)
> +{
> +	unsigned long mpp4 = readl(DOVE_MPP_CTRL4_VIRT_BASE);
> +	unsigned long mask;
> +
> +	switch (ctrl->pid) {
> +	case 24: /* mpp_camera */
> +		mask = DOVE_CAM_GPIO_SEL;
> +		break;
> +	case 40: /* mpp_sdio0 */
> +		mask = DOVE_SD0_GPIO_SEL;
> +		break;
> +	case 46: /* mpp_sdio1 */
> +		mask = DOVE_SD1_GPIO_SEL;
> +		break;
> +	case 58: /* mpp_spi0 */
> +		mask = DOVE_SPI_GPIO_SEL;
> +		break;
> +	case 62: /* mpp_uart1 */
> +		mask = DOVE_UART1_GPIO_SEL;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}

Wouldn't it be better to use #defines instead of the constants in the
case statements, and also share those #defines with:


> +static struct mvebu_mpp_ctrl dove_mpp_controls[] = {
> +	MPP_FUNC_CTRL(0, 0, "mpp0", dove_pmu_mpp_ctrl),
                      ^^^^

> +static struct mvebu_mpp_mode dove_mpp_modes[] = {
> +	MPP_MODE(0,
                 ^^
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