linux-kernel - Re: [PATCH 1/7] mtd: pxa3xx_nand: add a non mandatory ECC clock

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Date:	Wed, 03 Jun 2015 21:23:58 +0200
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
Cc:	sebastian.hesselbarth@...il.com,
	ezequiel.garcia@...e-electrons.com, dwmw2@...radead.org,
	computersforpeace@...il.com, zmxu@...vell.com,
	boris.brezillon@...e-electrons.com, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org, jszhang@...vell.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/7] mtd: pxa3xx_nand: add a non mandatory ECC clock

Antoine Tenart <antoine.tenart@...e-electrons.com> writes:

> Some controllers (as the coming Berlin nand controller) need to enable
> an ECC clock. Add support for this clock in the pxa3xx nand driver, and
> leave it as non mandatory.
> -	info->clk = devm_clk_get(&pdev->dev, NULL);
> +	info->clk = devm_clk_get(&pdev->dev, "nfc");
>  	if (IS_ERR(info->clk)) {
> -		dev_err(&pdev->dev, "failed to get nand clock\n");
> -		return PTR_ERR(info->clk);
> +		info->clk = devm_clk_get(&pdev->dev, NULL);
> +
> +		if (IS_ERR(info->clk)) {
> +			dev_err(&pdev->dev, "failed to get nand clock\n");
> +			return PTR_ERR(info->clk);
> +		}
I suppose this is done to keep the compatibility with existing pxa3xx/berlin
clock code, which was defined without a con_id. More specifically I'm thinking
of the function clk_find().

Now maybe it would be cleaner to keep you "nfc" change, remove the failback plan
with NULL as an con_id, and change the clock providers. I cannot speak for
berlin/others, but for pxa3xx, this is one 3 hunks change in :
 - drivers/clk/pxa/clk-pxa3xx.c

Cheers.

--
Robert
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