linux-kernel - Re: [PATCH 2/2] ARM: mach-imx: CAN clock fix for i.MX53

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Message-ID: <20121026085934.GA1641@pengutronix.de>
Date:	Fri, 26 Oct 2012 10:59:34 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Roland Stigge <stigge@...com.de>
Cc:	kernel@...gutronix.de, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] ARM: mach-imx: CAN clock fix for i.MX53

On Thu, Oct 25, 2012 at 01:26:40PM +0200, Roland Stigge wrote:
> This patch fixes CAN clocking on i.MX53.
> 
> Signed-off-by: Roland Stigge <stigge@...com.de>
> 
> ---
>  arch/arm/mach-imx/clk-imx51-imx53.c |    8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> --- linux-2.6.orig/arch/arm/mach-imx/clk-imx51-imx53.c
> +++ linux-2.6/arch/arm/mach-imx/clk-imx51-imx53.c
> @@ -426,10 +426,10 @@ int __init mx53_clocks_init(unsigned lon
>  	clk[usb_phy2_gate] = imx_clk_gate2("usb_phy2_gate", "usb_phy_sel", MXC_CCM_CCGR4, 12);
>  	clk[can_sel] = imx_clk_mux("can_sel", MXC_CCM_CSCMR2, 6, 2,
>  				mx53_can_sel, ARRAY_SIZE(mx53_can_sel));
> -	clk[can1_serial_gate] = imx_clk_gate2("can1_serial_gate", "can_sel", MXC_CCM_CCGR6, 22);
> -	clk[can1_ipg_gate] = imx_clk_gate2("can1_ipg_gate", "ipg", MXC_CCM_CCGR6, 20);
> -	clk[can2_serial_gate] = imx_clk_gate2("can2_serial_gate", "can_sel", MXC_CCM_CCGR4, 8);
> -	clk[can2_ipg_gate] = imx_clk_gate2("can2_ipg_gate", "ipg", MXC_CCM_CCGR4, 6);

I just rechecked. The above matches the i.MX53 Reference Manual rev 2.1

> +	clk[can1_serial_gate] = imx_clk_gate2("can1_serial_gate", "can_sel", MXC_CCM_CCGR4, 6);
> +	clk[can1_ipg_gate] = imx_clk_gate2("can1_ipg_gate", "ipg", MXC_CCM_CCGR4, 8);
> +	clk[can2_serial_gate] = imx_clk_gate2("can2_serial_gate", "can_sel", MXC_CCM_CCGR4, 6);
> +	clk[can2_ipg_gate] = imx_clk_gate2("can2_ipg_gate", "ipg", MXC_CCM_CCGR4, 8);

This doesn't.

Can you elaborate why you think this is necessary?

Sascha

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