linux-kernel - Re: [PATCH 5/7] MIPS: mscc: ocelot: add GPIO4 pinmuxing DT node

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Date:   Mon, 1 Oct 2018 11:01:34 +0200
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        ralf@...ux-mips.org, paul.burton@...s.com, jhogan@...nel.org,
        robh+dt@...nel.org, mark.rutland@....com, davem@...emloft.net,
        f.fainelli@...il.com, allan.nielsen@...rochip.com,
        linux-mips@...ux-mips.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        thomas.petazzoni@...tlin.com, antoine.tenart@...tlin.com
Subject: Re: [PATCH 5/7] MIPS: mscc: ocelot: add GPIO4 pinmuxing DT node

Hi Andrew,

On Fri, Sep 14, 2018 at 07:02:21PM +0200, Andrew Lunn wrote:
> On Fri, Sep 14, 2018 at 06:26:38PM +0200, Quentin Schulz wrote:
> > Hi Alexandre,
> > 
> > On Fri, Sep 14, 2018 at 04:54:46PM +0200, Alexandre Belloni wrote:
> > > Hi,
> > > 
> > > On 14/09/2018 11:44:26+0200, Quentin Schulz wrote:
> > > > In order to use GPIO4 as a GPIO, we need to mux it in this mode so let's
> > > > declare a new pinctrl DT node for it.
> > > > 
> > > > Signed-off-by: Quentin Schulz <quentin.schulz@...tlin.com>
> > > > ---
> > > >  arch/mips/boot/dts/mscc/ocelot.dtsi | 5 +++++
> > > >  1 file changed, 5 insertions(+)
> > > > 
> > > > diff --git a/arch/mips/boot/dts/mscc/ocelot.dtsi b/arch/mips/boot/dts/mscc/ocelot.dtsi
> > > > index 8ce317c..b5c4c74 100644
> > > > --- a/arch/mips/boot/dts/mscc/ocelot.dtsi
> > > > +++ b/arch/mips/boot/dts/mscc/ocelot.dtsi
> > > > @@ -182,6 +182,11 @@
> > > >  			interrupts = <13>;
> > > >  			#interrupt-cells = <2>;
> > > >  
> > > > +			gpio4: gpio4 {
> > > > +				pins = "GPIO_4";
> > > > +				function = "gpio";
> > > > +			};
> > > > +
> > > 
> > > For a GPIO, I would do that in the board dts because it is not used
> > > directly in the dtsi.
> > > 
> > 
> > And the day we've two boards using this pinctrl we move it to a dtsi. Is
> > that the plan?
> 
> Hi Quentin
> 
> gpio4 appears to be pretty arbitrary. Could a different design use a
> different gpio? It me, this seems like a board property.
> 

Right now, I don't see why it couldn't be.

Quentin

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