linux-kernel - Re: [PATCHv2 2/3] drm: exynos: hdmi: use hdmiphy as PHY

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Date:	Wed, 09 Apr 2014 13:05:04 +0200
From:	Tomasz Stanislawski <t.stanislaws@...sung.com>
To:	Andrzej Hajda <a.hajda@...sung.com>, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc:	kgene.kim@...sung.com, kishon@...com, kyungmin.park@...sung.com,
	robh+dt@...nel.org, grant.likely@...aro.org,
	sylvester.nawrocki@...il.com, rahul.sharma@...sung.com
Subject: Re: [PATCHv2 2/3] drm: exynos: hdmi: use hdmiphy as PHY

Hi Andrzej,
This issue could be solved by exporting a regmap from PMU driver
or Exynos clock provider for the usage by exynos-simple-phy.
The operations on PHYs from exynos-simple-phy provider would
be chained to PMU driver and protected by a spinlock in the regmap.

Luckily, the divider is not used as far as I know.

Regards,
Tomasz Stanislawski

On 04/09/2014 12:30 PM, Andrzej Hajda wrote:
> Hi Tomasz,
> 
> On 04/08/2014 04:37 PM, Tomasz Stanislawski wrote:
>> The HDMIPHY (physical interface) is controlled by a single
>> bit in a power controller's regiter. It was implemented
>> as clock. It was a simple but effective hack.
> 
> This power controller register has also bits to control HDMI clock
> divider ratio. I guess current drivers do not change it, but how do you
> want to implement access to it if some HDMI driver in the future will
> need to change ratio. I guess in case of clk it would be easier.
> 
> Regards
> Andrzej
> 
> 

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