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

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Message-ID: <20200929094300.GI26842@paasikivi.fi.intel.com>
Date:   Tue, 29 Sep 2020 12:43:00 +0300
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
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, Sep 29, 2020 at 11:18:46AM +0200, Krzysztof Kozlowski wrote:
> 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().

Btw. we also have this nowadays:
Documentation/driver-api/media/camera-sensor.rst .

-- 
Sakari Ailus