linux-kernel - Re: [PATCH v2] pinctrl: uniphier: drop meaningless pin from SD1 pin-mux of Pro4

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Date:   Wed, 29 Aug 2018 10:50:38 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] pinctrl: uniphier: drop meaningless pin from SD1
 pin-mux of Pro4

On Sat, Aug 11, 2018 at 4:16 AM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:

> The pin 327 was supposed to be used as a voltage control line for the
> SD card regulator, but the SD card port1 does not support UHS-I.  It
> only supports 3.3V signaling, hence this pin is pointless.
>
> Just a note about the background.  At first, hardware engineers tried
> to implement the UHS for this port.  Then, they needed to shrink the
> silicon die size, and gave up the UHS, but forgot to remove the pin
> assignment.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

Patch applied.

Yours,
Linus Walleij