linux-kernel - Re: [PATCH] i2c: tegra: Add ACPI support

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Date:   Mon, 22 Nov 2021 13:40:00 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>, ldewangan@...dia.com,
        thierry.reding@...il.com, jonathanh@...dia.com,
        p.zabel@...gutronix.de, sumit.semwal@...aro.org,
        christian.koenig@....com, linux-i2c@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org, andy.shevchenko@...il.com
Subject: Re: [PATCH] i2c: tegra: Add ACPI support

19.11.2021 16:32, Akhil R пишет:
> -	i2c_dev->rst = devm_reset_control_get_exclusive(i2c_dev->dev, "i2c");
> -	if (IS_ERR(i2c_dev->rst)) {
> -		dev_err_probe(i2c_dev->dev, PTR_ERR(i2c_dev->rst),
> -			      "failed to get reset control\n");
> -		return PTR_ERR(i2c_dev->rst);
> -	}
> -
>  	tegra_i2c_parse_dt(i2c_dev);
>  
> -	err = tegra_i2c_init_clocks(i2c_dev);
> -	if (err)
> -		return err;
> +	if (!has_acpi_companion(&pdev->dev)) {
> +		i2c_dev->rst = devm_reset_control_get_exclusive(i2c_dev->dev, "i2c");
> +		if (IS_ERR(i2c_dev->rst)) {
> +			dev_err_probe(i2c_dev->dev, PTR_ERR(i2c_dev->rst),
> +				      "failed to get reset control\n");
> +			return PTR_ERR(i2c_dev->rst);
> +		}
> +
> +		err = tegra_i2c_init_clocks(i2c_dev);
> +		if (err)
> +			return err;
> +	}

What about to factor out the reset initialization into a separate function and write it like this:

static int tegra_i2c_init_reset(i2c_dev)
{
	if (has_acpi_companion(i2c_dev->dev)
		return 0;

	i2c_dev->rst = devm_reset_control_get_exclusive(i2c_dev->dev, "i2c");
	if (IS_ERR(i2c_dev->rst))
		return dev_err_probe(i2c_dev->dev, PTR_ERR(i2c_dev->rst),
			      	     "failed to get reset control\n");

	return 0;
}

And then change tegra_i2c_init_clocks() to:

static int tegra_i2c_init_clocks(i2c_dev)
{
	int err;

	if (has_acpi_companion(i2c_dev->dev))
		return 0;

	...
}

This will make both reset/clocks initialization to look more consistent.