linux-kernel - Re: [PATCH v11 5/7] i2c: of-prober: Add GPIO support to simple helpers

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Message-ID: <7d9abefa-6400-424f-9cf5-439f4400a168@collabora.com>
Date: Thu, 14 Nov 2024 11:37:00 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Chen-Yu Tsai <wenst@...omium.org>,
 Matthias Brugger <matthias.bgg@...il.com>, Wolfram Sang <wsa@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
 Benson Leung <bleung@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>,
 chrome-platform@...ts.linux.dev, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Douglas Anderson <dianders@...omium.org>,
 Johan Hovold <johan@...nel.org>, Jiri Kosina <jikos@...nel.org>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 linux-i2c@...r.kernel.org, Andrey Skvortsov <andrej.skvortzov@...il.com>
Subject: Re: [PATCH v11 5/7] i2c: of-prober: Add GPIO support to simple
 helpers

Il 06/11/24 10:33, Chen-Yu Tsai ha scritto:
> Add GPIO support to the simple helpers for the I2C OF component prober.
> Components that the prober intends to probe likely require their
> regulator supplies be enabled, and GPIOs be toggled to enable them or
> bring them out of reset before they will respond to probe attempts.
> Regulator supplies were handled in the previous patch.
> 
> The assumption is that the same class of components to be probed are
> always connected in the same fashion with the same regulator supply
> and GPIO. The names may vary due to binding differences, but the
> physical layout does not change.
> 
> This supports at most one GPIO pin. The user must specify the GPIO name,
> the polarity, and the amount of time to wait after the GPIO is toggled.
> Devices with more than one GPIO pin likely require specific power
> sequencing beyond what generic code can easily support.
> 
> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>