linux-kernel - Re: [PATCH v2] gpio: rockchip: support 'clock-names' from dt nodes

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Message-ID: <ZsijIGTtHynR_jrm@smile.fi.intel.com>
Date: Fri, 23 Aug 2024 17:56:32 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Ye Zhang <ye.zhang@...k-chips.com>
Cc: linus.walleij@...aro.org, brgl@...ev.pl, heiko@...ech.de,
	linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	mika.westerberg@...ux.intel.com, tao.huang@...k-chips.com,
	finley.xiao@...k-chips.com, tim.chen@...k-chips.com,
	elaine.zhang@...k-chips.com
Subject: Re: [PATCH v2] gpio: rockchip: support 'clock-names' from dt nodes

On Fri, Aug 23, 2024 at 11:43:10AM +0800, Ye Zhang wrote:
> Added support for retrieving clocks using 'clock-names' from dt nodes

...

> +	bank->clk = devm_clk_get(dev, "bus");
> +	if (IS_ERR(bank->clk)) {
> +		bank->clk = of_clk_get(dev->of_node, 0);
> +		if (IS_ERR(bank->clk)) {

> +			dev_err(dev, "fail to get apb clock\n");
> +			return PTR_ERR(bank->clk);

			return dev_err_probe(...);

> +		}
> +	}

...

> +	clk_prepare_enable(bank->clk);
> +	clk_prepare_enable(bank->db_clk);

Any of this may fail. You perhaps want

	bank->...clk = devm_clk_get_enabled(dev, "...");

Not sure for the fallback case (of_clk_get() should be killed as we almost done
in GPIO library for GPIO APIs).

...

> +err_unlock:
> +	mutex_unlock(&bank->deferred_lock);

Don't you want to use guard()/scoped_guard() at some point?

-- 
With Best Regards,
Andy Shevchenko