linux-kernel - Re: [v2 2/3] media: ov8856: Add devicetree support

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Message-ID: <20200313122806.GT1922688@smile.fi.intel.com>
Date:   Fri, 13 Mar 2020 14:28:06 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     Dongchun Zhu <dongchun.zhu@...iatek.com>,
        Fabio Estevam <festevam@...il.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Tomasz Figa <tfiga@...omium.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [v2 2/3] media: ov8856: Add devicetree support

On Fri, Mar 13, 2020 at 12:03:49PM +0100, Robert Foss wrote:
> Add devicetree match table, and enable ov8856_probe()
> to initialize power, clocks and reset pins.

Thanks for an update.
My comments below.

...

> +	ov8856->xvclk = devm_clk_get(&client->dev, "xvclk");

In many frameworks we have '_optional' variants of API. Please use it instead
of open coded approach.

> +	if (PTR_ERR(ov8856->xvclk) == -ENOENT) {
> +		dev_info(&client->dev, "xvclk clock not defined, continuing...\n");
> +		ov8856->xvclk = NULL;
> +	} else if (IS_ERR(ov8856->xvclk)) {
> +		dev_err(&client->dev, "could not get xvclk clock (%ld)\n",
> +			PTR_ERR(ov8856->xvclk));
> +		return PTR_ERR(ov8856->xvclk);
> +	}
> +
> +	ret = clk_set_rate(ov8856->xvclk, OV8856_XVCLK_24);
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed to set xvclk rate (24MHz)\n");
> +		return ret;
> +	}
> +

> +	ov8856->reset_gpio = devm_gpiod_get(&client->dev, "reset",
> +					       GPIOD_OUT_HIGH);

Same here.

> +	if (IS_ERR(ov8856->reset_gpio)) {
> +		dev_err(&client->dev, "failed to get reset-gpios\n");
> +		return PTR_ERR(ov8856->reset_gpio);
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(ov8856_supply_names); i++)
> +		ov8856->supplies[i].supply = ov8856_supply_names[i];
> +

> +	ret = devm_regulator_bulk_get(&client->dev,
> +				      ARRAY_SIZE(ov8856_supply_names),
> +				      ov8856->supplies);

Luckily regulator framework will create dummy ones if there is none found.

> +	if (ret) {
> +		dev_warn(&client->dev, "failed to get regulators\n");
> +		return ret;
> +	}

-- 
With Best Regards,
Andy Shevchenko