linux-kernel - Re: [PATCH v2] pinctrl/nomadik: add device tree support

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Date:	Wed, 02 Jan 2013 13:29:49 -0700
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>,
	Anmar Oueja <anmar.oueja@...aro.org>,
	Gabriel Fernandez <gabriel.fernandez@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v2] pinctrl/nomadik: add device tree support

On 12/20/2012 01:35 AM, Linus Walleij wrote:
> From: Gabriel Fernandez <gabriel.fernandez@...ricsson.com>
> 
> This implements pin multiplexing and pin configuration for
> the Nomadik pin controller using the device tree.

> diff --git a/Documentation/devicetree/bindings/pinctrl/ste,nomadik.txt b/Documentation/devicetree/bindings/pinctrl/ste,nomadik.txt

> +Required properties:
> +- compatible: "stericsson,nmk_pinctrl"

- rather than _ is more typically used, but not a big deal.

> +mux function to select on those pin(s)/group(s), and various pin configuration
> +parameters, such as inputn output, pull up, pull down...

s/n/,/ ?

> +Example board file extract:
> +
> +	pinctrl {
> +		compatible = "stericsson,nmk_pinctrl";
> +		reg = <0x80157000 0x2000>;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&uart0_default_mode>;
...
> +	uart@...20000 {
> +		compatible = "arm,pl011", "arm,primecell";
> +		reg = <0x80120000 0x1000>;
> +		interrupts = <0 11 0x4>;
> +
> +		pinctrl-names = "default","sleep";
> +		pinctrl-0 = <&uart0_default_mux>, <&uart0_default_mode>;
> +		pinctrl-1 = <&uart0_sleep_mode>;
> +	};

Both pinctrl and uart@...20000 are going to try and claim/use the
content of &uart0_default_mode in that example, which I don't think will
work.

> +

There's a blank line at the end of the file.

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

> +int nmk_pinctrl_dt_subnode_to_map(struct pinctrl_dev *pctldev,

> +	unsigned reserve = 1;
...> +	ret = of_property_read_string(np, "ste,function", &function);
> +	if (ret < 0)
> +		reserve = 0;

It might be a little simpler to say:

reserve = 0;
...
	ret = of_property_read_string(np, "ste,function", &function);
	if (ret >= 0)
		reserve = 1;

but not a big deal I suppose.

Aside from that,
Reviewed-by: Stephen Warren <swarren@...dia.com>
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