linux-kernel - Re: [PATCH 1/2] media: i2c: Add GC08A3 image sensor driver

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Date:   Fri, 8 Dec 2023 09:54:11 +0000
From:   "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>
To:     Zhi Mao (毛智) <zhi.mao@...iatek.com>
Cc:     "conor@...nel.org" <conor@...nel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
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Subject: Re: [PATCH 1/2] media: i2c: Add GC08A3 image sensor driver

Hi Zhi,

On Fri, Dec 08, 2023 at 02:07:36AM +0000, Zhi Mao (毛智) wrote:
> On Thu, 2023-12-07 at 17:44 +0000, Conor Dooley wrote:
> > On Thu, Dec 07, 2023 at 01:30:35PM +0100, Krzysztof Kozlowski wrote:
> > > On 07/12/2023 12:34, Sakari Ailus wrote:
> > > > > +	ret = gc08a3_parse_fwnode(dev);
> > > > > +	if (ret)
> > > > > +		return ret;
> > > > > +
> > > > > +	gc08a3 = devm_kzalloc(dev, sizeof(*gc08a3),
> > > > > GFP_KERNEL);
> > > > > +	if (!gc08a3)
> > > > > +		return -ENOMEM;
> > > > > +
> > > > > +	gc08a3->dev = dev;
> > > > > +
> > > > > +	gc08a3->xclk = devm_clk_get(dev, NULL);
> > > > > +	if (IS_ERR(gc08a3->xclk))
> > > > > +		return dev_err_probe(dev, PTR_ERR(gc08a3-
> > > > > >xclk),
> > > > > +					 "failed to get
> > > > > xclk\n");
> > > > > +
> > > > > +	ret = clk_set_rate(gc08a3->xclk,
> > > > > GC08A3_DEFAULT_CLK_FREQ);
> > > > 
> > > > Please see:
> > > > <URL:
> > > > https://hverkuil.home.xs4all.nl/spec/driver-api/camera-sensor.html#devicetree>
> > > > ;.
> > > 
> > > 
> > > Oh, that's cool it was documented!
> > > 
> > > The canonical link would be:
> > > 
> https://www.kernel.org/doc/html/latest/driver-api/media/camera-sensor.html#devicetree
> > 
> > I believe this is that answer to the "why are these needed" that I
> > asked
> > on the previous version and never got a response to. Instead, they
> > were
> > just removed from the binding etc.
> 
> About "assigned-clocks" & "assigned-clock-rates" in v1 patch, as they
> are not used in sensor driver, I have removed them in sensor dts-
> bindind file. And "clock-names" & "clock-frequency" are also the same,
> they will be removed in next version.

Ack. You should only need "clocks" there, indeed.

-- 
Regards,

Sakari Ailus