[PATCH v15 12/12] drm: bridge/dw_hdmi: add rockchip rk3288 support

Andy Yan andy.yan at rock-chips.com
Wed Dec 3 05:20:06 PST 2014

Hi Philipp:
On 2014年12月03日 21:09, Philipp Zabel wrote:
> Hi Andy,
> Am Mittwoch, den 03.12.2014, 20:32 +0800 schrieb Andy Yan:
>>> My question is not about the available gates at the SoC level, but about
>>> the actual clock inputs from point of view of the HDMI TX IP.
>>> It could be that the hdmi_ctrl_clk gates all inputs to the module and
>>> bus clocks together. If so, you could just reuse "isfr" and "iahb" and
>>> set it to the same clock. If not, we'd need to think of something else.
>>> Unfortunately I don't have any Synopsys documentation of the HDMI TX at
>>> that level.
>>      After confirming with the IC designer, we finally make clear that
>>      Rockchip RK3288 almost use the same clock design with imx:
>>      clk-----iahbclk, used for hdmi module and bus
>>      hdcp_clk-----isfrclk, used for hdcp and i2cm
>>      cecclk -----cecclk, but this clk can be gated on rockchip, this is
>> different with imx,
>>      but we don't handle the cec stuff now. So i will try to reuse the
>> imx clk binds. do you
>>     think that is ok?
> Thank you for taking the time to verify this. So we should move the
> clock handling out of the soc specific parts into the common driver and
> reuse the existing clock bindings ("iahb", "isfr").
> I'd suggest to add the "cec" clock now to the binding document as an
> optional clock, then you can already specify it in the rockchip dtsi.
> regards
> Philipp

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