linux-kernel - Re: [PATCH 1/7] mfd: add imx syscon driver based on regmap

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Date:	Wed, 22 Aug 2012 17:02:41 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Dong Aisheng <b29396@...escale.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linus.walleij@...ricsson.com, s.hauer@...gutronix.de,
	shawn.guo@...aro.org, kernel@...gutronix.de,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	sameo@...ux.intel.com, lrg@...com, richard.zhao@...escale.com,
	devicetree-discuss@...ts.ozlabs.org, swarren@...dotorg.org,
	paul.liu@...aro.org
Subject: Re: [PATCH 1/7] mfd: add imx syscon driver based on regmap

On Wed, Aug 22, 2012 at 03:18:42PM +0800, Dong Aisheng wrote:

> From: Dong Aisheng <dong.aisheng@...aro.org>

> Add regmap based imx syscon driver.

Nice to see more regmap-mmio usage!

Reviwed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>

from a regmap point of view.

> +int imx_syscon_write(struct device_node *np, u32 reg, u32 val)
> +{
> +	struct device *dev;
> +	struct imx_syscon *syscon;
> +	int ret = 0;
> +
> +	dev = driver_find_device(&imx_syscon_driver.driver, NULL, np,
> +				 imx_syscon_match);
> +	if (!dev)
> +		return -EPROBE_DEFER;
> +
> +	syscon = dev_get_drvdata(dev);
> +	ret = regmap_write(syscon->regmap, reg, val);

It'd be good to provide a way of retrieving the regmap so that drivers
for subsystems with generic regmap code could use the framework features
(regulator is one example that I just mentioned in my other mail).

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