linux-kernel - Re: [PATCH] pinctrl: meson: define the pull up/down resistor value as 60 kOhm

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Message-ID: <CACRpkdbSouYkMHvuVoAeFUiqTVvZwN1thzuewqWYUYMuRGYuBA@mail.gmail.com>
Date: Tue, 15 Apr 2025 09:48:00 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-amlogic@...ts.infradead.org, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] pinctrl: meson: define the pull up/down resistor value as
 60 kOhm

On Sat, Mar 29, 2025 at 8:01 PM Martin Blumenstingl
<martin.blumenstingl@...glemail.com> wrote:

> The public datasheets of the following Amlogic SoCs describe a typical
> resistor value for the built-in pull up/down resistor:
> - Meson8/8b/8m2: not documented
> - GXBB (S905): 60 kOhm
> - GXL (S905X): 60 kOhm
> - GXM (S912): 60 kOhm
> - G12B (S922X): 60 kOhm
> - SM1 (S905D3): 60 kOhm
>
> The public G12B and SM1 datasheets additionally state min and max
> values:
> - min value: 50 kOhm for both, pull-up and pull-down
> - max value for the pull-up: 70 kOhm
> - max value for the pull-down: 130 kOhm
>
> Use 60 kOhm in the pinctrl-meson driver as well so it's shown in the
> debugfs output. It may not be accurate for Meson8/8b/8m2 but in reality
> 60 kOhm is closer to the actual value than 1 Ohm.
>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Patch applied for fixes!

Yours,
Linus Walleij