linux-kernel - Re: [PATCH v4 1/4] dt-bindings: media: imx258: add bindings for IMX258 sensor

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Message-ID: <CAJKOXPfRnMg2sUO8dd8CRrwyQFNr-9HN5-QV7Uy4YTVrRJosWQ@mail.gmail.com>
Date:   Tue, 29 Sep 2020 11:18:46 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/4] dt-bindings: media: imx258: add bindings for
 IMX258 sensor

On Tue, 29 Sep 2020 at 11:15, Sakari Ailus <sakari.ailus@...ux.intel.com> wrote:
>
> Hi Krzysztof,
>
> On Wed, Sep 23, 2020 at 05:21:26PM +0200, Krzysztof Kozlowski wrote:
> > Add bindings for the IMX258 camera sensor.  The bindings, just like the
> > driver, are quite limited, e.g. do not support regulator supplies.
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> >
> > ---
> >
> > Changes since v3:
> > 1. Document also two lane setup.
> >
> > Changes since v2:
> > 1. Remove clock-frequency, add reset GPIOs, add supplies.
>
> Oops. I missed this one.
>
> How does the driver know the appropriate clock frequency for the platform
> if it's not in DT? The sensor supports a range of frequencies, not a single
> frequency.
>
> Could you add clock-frequency back?

Not really, it was removed on Rob's request. The bindings do not
describe driver's behavior so how the driver gets frequency should not
be part of the bindings. Also it's not a real problem - the driver
just calls clk_get_rate().

Best regards,
Krzysztof