linux-kernel - Re: [PATCH V3 07/12] ata/sata_mv: Remove conditional compilation of clk code

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Date:	Tue, 24 Apr 2012 14:00:19 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	akpm@...ux-foundation.org, spear-devel@...t.st.com,
	viresh.linux@...il.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, mturquette@...aro.org,
	sshtylyov@...sta.com, jgarzik@...hat.com, linux@....linux.org.uk,
	Andrew Lunn <andrew@...n.ch>, linux-ide@...r.kernel.org
Subject: Re: [PATCH V3 07/12] ata/sata_mv: Remove conditional compilation of
 clk code

> -#if defined(CONFIG_HAVE_CLK)
>  	hpriv->clk = clk_get(&pdev->dev, NULL);
> -	if (IS_ERR(hpriv->clk))
> -		dev_notice(&pdev->dev, "cannot get clkdev\n");
> -	else
> -		clk_enable(hpriv->clk);
> -#endif
> +	if (IS_ERR(hpriv->clk)) {
> +		dev_err(&pdev->dev, "cannot get clkdev\n");
> +		return PTR_ERR(hpriv->clk);
> +	}
> +
> +	clk_enable(hpriv->clk);

Sorry, but still wrong.

The clock is optional. If we can find a clock, turn it on. If not,
keep going....

You patch causes the missing clock to become a fatal error.

This sata_mv exists in multiple forms. It can be part of a SoC. It can
also be on a PCI bus. In the PCI form, it is unlikely to have a clk
which can be controlled. When built into a SoC, namely one of the
Orion family, dove, orion5x, mv78xx0 do not have a clock which can be
controlled. However kirkwood does have a clock.

So, kirkwood will provide a clock and expects that sata_mv will turn
it on. All the other ways of using sata_mv will not provide a clock,
but still expect the driver to be happy.

    Andrew
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