linux-kernel - Re: [PATCH v15 12/12] drm: bridge/dw

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Date:	Wed, 03 Dec 2014 21:20:06 +0800
From:	Andy Yan <andy.yan@...k-chips.com>
To:	Philipp Zabel <p.zabel@...gutronix.de>
CC:	airlied@...ux.ie, heiko@...ech.de, fabio.estevam@...escale.com,
	rmk+kernel@....linux.org.uk,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Shawn Guo <shawn.guo@...aro.org>,
	Josh Boyer <jwboyer@...hat.com>,
	Sean Paul <seanpaul@...omium.org>,
	Inki Dae <inki.dae@...sung.com>,
	Dave Airlie <airlied@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Lucas Stach <l.stach@...gutronix.de>,
	Zubair.Kakakhel@...tec.com, djkurtz@...gle.com, ykk@...k-chips.com,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, jay.xu@...k-chips.com,
	Pawel Moll <pawel.moll@....com>, mark.yao@...k-chips.com,
	Mark Rutland <mark.rutland@....com>,
	vladimir_zapolskiy@...tor.com,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v15 12/12] drm: bridge/dw_hdmi: add rockchip rk3288 support

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.
   ok
>
> regards
> Philipp
>
>
>

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