linux-kernel - Re: [PATCH v3] ARM: dts: tpc: Device tree description of the iMX6Q TPC board

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Date:   Thu, 5 Apr 2018 16:42:32 +0200
From:   Lukasz Majewski <lukma@...x.de>
To:     Fabio Estevam <festevam@...il.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] ARM: dts: tpc: Device tree description of the iMX6Q
 TPC board

Hi Fabio,

> Hi Lukasz,
> 
> On Thu, Apr 5, 2018 at 4:09 AM, Lukasz Majewski <lukma@...x.de> wrote:
> 
> > +       reg_audio: regulator-audio {
> > +               compatible = "regulator-fixed";
> > +               regulator-name = "sgtl5000-supply";
> > +               gpio = <&gpio6 31 GPIO_ACTIVE_HIGH>;
> > +               enable-active-high;
> > +               regulator-always-on;
> > +       };  
> 
> sgtl5000 has 3 supplies: VDDD, VDDIO, VDDA.
> 
> Which supply does this reg_audio supply to the chip?

It supplies none of the above. This regulator is needed to enable
amplifier output placed after sgtl5000 device.

> 
> Can't you use any of the existing sgtl5000 regulator bindings to
> describe this supply?

As stated before - this supply enables the output of the amplifier.


Best regards,

Lukasz Majewski

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