linux-kernel - Re: [PATCH 01/18] regmap: mmio: Add function to attach a clock

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Date:   Mon, 17 Jul 2017 11:01:07 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH 01/18] regmap: mmio: Add function to attach a clock

Hi Mark,

On Thu, Jul 13, 2017 at 05:01:42PM +0100, Mark Brown wrote:
> On Thu, Jul 13, 2017 at 04:12:56PM +0200, Maxime Ripard wrote:
> 
> > This might be problematic if the clock to enable is stored in another node.
> > Let's add a function that allows to attach a clock that has already been
> > retrieved to a regmap in order to fix this.
> 
> What is the use case for this?

This is useful when the clock you want to be handled by the regmap is
not described in the device node that probed the driver, but one of
its subnode, or an another node entirely.

We're in the latter case, where we have two controllers in the DT, but
are driven by the same driver. We'll create two regmaps, but one will
not have the proper of_node used to retrieve the clock.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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