linux-kernel - Re: [PATCH] pinctrl: tegra: clear park bit for all pins

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Message-ID: <CACRpkdZYPhx_ma1RH7-HbW-ERg9jLO=5TdPo1-51T3MXypN=DQ@mail.gmail.com>
Date:	Thu, 14 Apr 2016 14:02:12 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Rhyland Klein <rklein@...dia.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.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] pinctrl: tegra: clear park bit for all pins

On Thu, Apr 7, 2016 at 11:37 PM, Rhyland Klein <rklein@...dia.com> wrote:

> Parking bits might not be cleared by the bootloader properly (if for
> instance it doesn't use the device configured by that pin). Clear
> the park bits for all the pins during pinctrl probe.
>
> This is present on T210 platforms but not earlier ones, so for earlier
> generations, set parked_reg = -1 to disable.
>
> The park bit is used to prevent glitching when reprogramming pinctrl
> registers.
>
> Based on work by:
> Shravani Dingari <shravanid@...dia.com>
>
> Signed-off-by: Rhyland Klein <rklein@...dia.com>

Patch applied with Stephen's ACK.

Yours,
Linus Walleij