linux-kernel - Re: [PATCH 08/20] pinctrl: Assume map table entries can't have a NULL name field

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Date:	Tue, 21 Feb 2012 21:09:36 +0800
From:	Dong Aisheng <dongas86@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Stephen Warren <swarren@...dia.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	B29396@...escale.com, s.hauer@...gutronix.de, shawn.guo@...aro.org,
	thomas.abraham@...aro.org, tony@...mide.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/20] pinctrl: Assume map table entries can't have a NULL
 name field

On Tue, Feb 21, 2012 at 5:42 AM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Mon, Feb 20, 2012 at 7:45 AM, Stephen Warren <swarren@...dia.com> wrote:
>
>> pinctrl_register_mappings() already requires that every mapping table
>> entry have a non-NULL name field.
>>
>> Logically, this makes sense too; drivers should always request a specific
>> named state so they know what they're getting. Relying on getting the
>> first mentioned state in the mapping table is error-prone, and a nasty
>> special case to implement, given that a given the mapping table may define
>> multiple states for a device.
>>
>> Update a few places in the code and documentation that still allowed for
>> NULL name fields.
>>
>> Signed-off-by: Stephen Warren <swarren@...dia.com>
>
> This causes a regression on U300 and most certainly on the Sirf Prima II
> as well. The U300 can be fixed up as per below:
>
> diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
> index bb1034f..66555d7 100644
> --- a/arch/arm/mach-u300/core.c
> +++ b/arch/arm/mach-u300/core.c
> @@ -1645,7 +1645,7 @@ static int __init u300_pinctrl_fetch(void)
>                struct pinctrl *p;
>                int ret;
>
> -               p = pinctrl_get(u300_mux_hogs[i].dev, NULL);
> +               p = pinctrl_get(u300_mux_hogs[i].dev, u300_mux_hogs[i].name);
>                if (IS_ERR(p)) {
>                        pr_err("u300: could not get pinmux hog %s\n",
>                               u300_mux_hogs[i].name);
>
>
> The drivers/tty/serial/sirfsoc_uart.c asks for it's UART pinctrl like
> this:
>
> sirfport->p = pinctrl_get(&pdev->dev, NULL);
>
> I don't know quite what to encode in there, if "deafult" is sensible
> we might just
>
> #define PIN_MAP_NAME_DEFAULT "default"
> In <linux/pinctrl/consumer.h> and <linux/pinctrl/machine.h> alike,
> maybe in some <linux/pinctrl/mapnames.h> that both of these
> include?
>
I feel a little strange to put such thing in common code.
Personally i still like the original way you did.

> the have the driver ask for:
>
> sirfport->p = pinctrl_get(&pdev->dev, PIN_MAP_NAME_DEFAULT);
>
> (Similar changes can be done for U300, naming all its map
> "default".)
>

Regards
Dong Aisheng
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