linux-kernel - Re: [PATCH REBASE 2/2] i2c: tegra: dynamically control fast clk

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Message-ID: <20120818185244.GD19802@pengutronix.de>
Date:	Sat, 18 Aug 2012 20:52:44 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Laxman Dewangan <ldewangan@...dia.com>
Cc:	khali@...ux-fr.org, swarren@...dia.com, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
	olof@...om.net
Subject: Re: [PATCH REBASE 2/2] i2c: tegra: dynamically control fast clk

On Sat, Aug 18, 2012 at 12:32:35AM +0530, Laxman Dewangan wrote:
> Tegra I2C driver enables the fast clock during initialization
> and does not disable till driver removed.
> Enable this clock before transfer and disable after transfer done.
> 
> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>

Except that this patch is affected from the flaw of the previous patch,
it looks good to me.

> -	clk_prepare_enable(i2c_dev->clk);
> +	tegra_i2c_clock_enable(i2c_dev);

This should be div_clk.

>  	for (i = 0; i < num; i++) {
>  		enum msg_end_type end_type = MSG_END_STOP;
>  		if (i < (num - 1)) {
> @@ -597,7 +621,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
>  		if (ret)
>  			break;
>  	}
> -	clk_disable_unprepare(i2c_dev->div_clk);
> +	tegra_i2c_clock_disable(i2c_dev);
>  	return ret ?: i;

If that is fixed, you can add

Reviewed-by: Wolfram Sang <w.sang@...gutronix.de>

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