[PATCH] clk: debugfs add clk_rate_fops with DEBUG

[zhangfei gao]

On Tue, Oct 8, 2013 at 5:29 AM, Mike Turquette <mturquette at linaro.org> wrote:
> Quoting Zhangfei Gao (2013-08-18 22:34:17)
>> clk_rate_fops is added to debug
>> 1. set_rate (e.g. PLL)
>> 2. Choose mux parent, since mux could choose parent accordingly when set_rate.
>>
>> Causion: set_rate can be called directly from user space
>>
>> Example:
>> sfc_mux have two parents: 24M and 200M
>>
>> cat clk_summary
>>    clock                        enable_cnt  prepare_cnt  rate
>> ---------------------------------------------------------------------
>>  osc24mhz                       3           3            24000000
>>     bpll_fout3                  0           0            200000000
>>        sfc_mux                  0           0            200000000
>>           sfc                   0           0            200000000
>>
>> cat osc24mhz/bpll/bpll_fout3/sfc_mux/sfc/clk_rate
>> 200000000
>>
>> echo 24000000 >  osc24mhz/bpll/bpll_fout3/sfc_mux/sfc/clk_rate
>> cat clk_summary
>>    clock                        enable_cnt  prepare_cnt  rate
>> ---------------------------------------------------------------------
>>  osc24mhz                       3           3            24000000
>>     sfc_mux                     0           0            24000000
>>        sfc                      0           0            24000000
>>     bpll_fout3                  0           0            200000000
>>
>> cat osc24mhz/sfc_mux/sfc/clk_rate
>> 24000000
>>
>> Signed-off-by: Zhangfei Gao <zhangfei.gao at linaro.org>
>
> Thanks for the patch. It is trivial enough where I think we can leave it
> on the list and let developers apply it if they need it for debug. I
> don't want to merge it since it exposes hardware control to userspace
> and could be abused in a way that could damage a device.
>
> Regards,
> Mike
>

Thanks Mike

Understand the risk, it is fine.

Thanks