linux-kernel - Re: [PATCH v3 14/30] dt-bindings: update the Allwinner GPADC device tree binding for H3 & A83T

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Message-ID: <20180911091232.2ozypemfam5kayef@flea>
Date:   Tue, 11 Sep 2018 11:12:32 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Philipp Rossak <embed3d@...il.com>, lee.jones@...aro.org,
        mark.rutland@....com, wens@...e.org, linux@...linux.org.uk,
        jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, eugen.hristev@...rochip.com,
        rdunlap@...radead.org, vilhelm.gray@...il.com,
        clabbe.montjoie@...il.com, quentin.schulz@...tlin.com,
        geert+renesas@...der.be, lukas@...ner.de, icenowy@...c.io,
        arnd@...db.de, broonie@...nel.org, arnaud.pouliquen@...com,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v3 14/30] dt-bindings: update the Allwinner GPADC device
 tree binding for H3 & A83T

On Mon, Sep 10, 2018 at 02:44:24PM -0500, Rob Herring wrote:
> On Fri, Aug 31, 2018 at 10:48:54AM +0200, Maxime Ripard wrote:
> > On Thu, Aug 30, 2018 at 05:45:02PM +0200, Philipp Rossak wrote:
> > > Allwinner H3 features a thermal sensor like the one in A33, but has its
> > > register re-arranged, the clock divider moved to CCU (originally the
> > > clock divider is in ADC) and added a pair of bus clock and reset.
> > > 
> > > Allwinner A83T features a thermal sensor similar to the H3, the ths clock,
> > > the bus clock and the reset was removed from the CCU. The THS in A83T
> > > has a clock that is directly connected and runs with 24 MHz.
> > > 
> > > Update the binding document to cover H3 and A83T.
> > > 
> > > Signed-off-by: Philipp Rossak <embed3d@...il.com>
> > 
> > You probably want to have a look at:
> > https://www.spinics.net/lists/arm-kernel/msg670167.html
> 
> Well, which is it? An ADC or thermal sensor?

It's both actually. This IP used to be called GPADC, and had a thermal
sensor + some ADC channels. The design evolved across several
generations of SoCs to drop the ADC channels and be used only to have
thermal sensors.

Maxime

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

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