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

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Message-ID: <508EF59D.6040202@antcom.de>
Date:	Mon, 29 Oct 2012 22:31:09 +0100
From:	Roland Stigge <stigge@...com.de>
To:	Sascha Hauer <s.hauer@...gutronix.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 29/10/12 22:20, Sascha Hauer wrote:
> Roland,
> 
> Do you have updates on this one? I think this patch is wrong, specifying
> the clock rate in the devicetree is only for PowerPC, so I think this
> needs further investigation.

Please ignore it for now. As discussed with Marc, the issue seemed to be
caused by me (wrongfully) using the "clock-frequency" dt property which
caused probe() to ignore the clocks.

A colleague of mine will notify me if the problem surfaces again. So for
now I assume it's gone.

Maybe the above strategy regarding "clock-frequency" needs to be
documented better or changed, though, to prevent more confusion like in
the above case.

Thanks,

Roland

> 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);
>> +	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);
>>  	clk[i2c3_gate] = imx_clk_gate2("i2c3_gate", "per_root", MXC_CCM_CCGR1, 22);
>>  
>>  	for (i = 0; i < ARRAY_SIZE(clk); i++)
>>
> 

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