linux-kernel - Re: [PATCH] pinctrl/nomadik: Add "ste,config" property

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Date:	Fri, 04 Jan 2013 13:02:33 -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] pinctrl/nomadik: Add "ste,config" property

On 01/04/2013 09:13 AM, Linus Walleij wrote:
> From: Gabriel Fernandez <gabriel.fernandez@...ricsson.com>
> 
> The "ste,config" property will contain the pin config node.
> It will be easier to define a pin configuration and use it by
> reference without duplicating lines tedious.
> 
> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...ricsson.com>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>

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

> -- ste,input : <0/1/2/3>
> +- ste,config: Handle of pin configuration node (ste,config = <&in_pu>)
> +
> +- ste,input : <0/1/2>

The changes to ste,input and ste,sleep-output look like some unrelated
change.

I guess the idea of ste,input is quite neat, but ...

>  Example board file extract:
>  
> +	in_pu: input_pull_up {
> +		ste,input = <1>;
> +	};

... these nodes shouldn't be placed at the top-level of the device tree;
housing them inside the pin controller node itself makes much more sense
since the pin controller binding is able/allowed to define what goes
inside the pin controller node, but shouldn't influence the top-level of
the device tree.

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

> +	np_config = of_parse_phandle(np, "ste,config", 0);
> +	if (np_config) {
> +		for (i = 0; i < ARRAY_SIZE(nmk_cfg_params); i++) {
> +			unsigned long cfg = 0;
> +			int val;

Is it worth making ste,config optional, so that config properties can be
placed either into the node directly, or into a node referenced by
ste,config? That might make doing one-off unusual configurations easier
- no need to create a separate node that's only used once. Still, if
that's unlikely on your HW, it's probably no big deal.
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