linux-kernel - Re: [PATCH V2] pinctrl: tegra: Correctly check the supported configuration

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Date:	Wed, 11 May 2016 11:24:00 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Rhyland Klein <rklein@...dia.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] pinctrl: tegra: Correctly check the supported configuration

On Mon, May 2, 2016 at 7:23 PM, Laxman Dewangan <ldewangan@...dia.com> wrote:

> The pincontrol registers of Tegra chips has multiple filed per
> registers. There is two type of registers mux and drive. All
> configurations belongs to one of these registers.
>
> If any configurations are supported then <config>_bit is set to
> bit position of these registers otherwise -1 to not support it.
> The member is defined as
>         s32 <config>_bit:6;
>
> So if config is not supported ifor given SoC then it is set to -1
> in soc pinmmux table.
> In common driver code, to find out that given config is supported
> or not, it is checked as:
>
> s8 bit = <config>_bit;
> if (bit > 31) {
>         /* Not supported config */
> }
>
> But in this case, bit is s8 and hence for non supporting it is -1.
>
> Correct the check as:
> if (bit < 0) {
>         /* Not supported config */
> }
>
> Fixes: e4c02dced975cb ("pinctrl: tegra: use signed bitfields for optional fields")
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>

Patch applied with Stephen's ACK.

Yours,
Linus Walleij