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

From: Andy Yan
Date: Wed Dec 03 2014 - 08:20:38 EST

Hi Philipp:
On 2014å12æ03æ 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.


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