Re: [PATCH v4 1/2] arm64: dts: rockchip: add "rockchip, grf" property for RK3399 PMUCRU/CRU

[Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>]

Hi Doug,

On 2017年01月11日 02:45, Doug Anderson wrote:
> Hi,
>
> On Mon, Jan 9, 2017 at 10:15 PM, Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org> wrote:
>> The structure rockchip_clk_provider needs to refer the GRF regmap
>> in somewhere, if the CRU node has not "rockchip,grf" property,
>> calling syscon_regmap_lookup_by_phandle will return an invalid GRF
>> regmap, and the MUXGRF type clock will be not supported.
>>
>> Therefore, we need to add them.
>>
>> Signed-off-by: Xing Zheng <zhengxing-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
>> ---
>>
>> Changes in v4:
>> - separte the binding patch
>>
>> Changes in v3:
>> - add optional roperty rockchip,grf in rockchip,rk3399-cru.txt
>>
>> Changes in v2:
>> - referring pmugrf for PMUGRU
>> - fix the typo "invaild" in COMMIT message
>>
>>   arch/arm64/boot/dts/rockchip/rk3399.dtsi | 2 ++
>>   1 file changed, 2 insertions(+)
> This seems fine to me, so:
>
> Reviewed-by: Douglas Anderson <dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
>
> ...but I will say that before you actually add any real "MUXGRF"
> clocks on rk3399 you _might_ need to rework the code to make things
> truly "optional".  If it turns out that any existing clocks that
> already exist today already go through one of these muxes in the GRF
> and we've always been assuming one setting of the mux, we'll need to
> make sure we keep assuming that setting of the mux even if the "grf"
> isn't specified.
>
> As I understand it, your motivation for this patch is to eventually be
> able to model the EDP reference clock which can either be xin24 or
> "edp osc".  Presumably the eDP "reference clock" isn't related to any
> of the pre-existing eDP clocks so that one should be safe.

Hmm... I had intended to use this patch for EDP reference clock, but we 
don't need to change the parent
clock (see the BUG: 61664).

I just woud like to add this patch to avoid getting some unavailable 
MUXGRF clock and need to debug it again,
if we support it one day in future.

Thanks.

-- 
- Xing Zheng


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