linux-kernel - Re: [PATCH v2 5/9] drm/sun4i: tcon_top: Register clock gates in probe

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Message-ID: <20190617114503.pclqsf6bo3ih47nt@flea>
Date:   Mon, 17 Jun 2019 13:45:03 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-sunxi@...glegroups.com, linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v2 5/9] drm/sun4i: tcon_top: Register clock gates in probe

On Fri, Jun 14, 2019 at 10:13:20PM +0530, Jagan Teki wrote:
> TCON TOP have clock gates for TV0, TV1, dsi and right
> now these are register during bind call.
>
> Of which, dsi clock gate would required during DPHY probe
> but same can miss to get since tcon top is not bound at
> that time.
>
> To solve, this circular dependency move the clock gate
> registration from bind to probe so-that DPHY can get the
> dsi gate clock on time.

It's not really clear to me what the circular dependency is?

if you have a chain that is:

tcon-top +-> DSI
         +-> D-PHY

There's no loop, right?

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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