linux-kernel - Re: [PATCH] powerpc: dts: turris1x.dts: Add channel labels for temperature sensor

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Message-ID: <20221129185613.gunub5hgjfgvroh5@pali>
Date:   Tue, 29 Nov 2022 19:56:13 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Marek Behún <kabel@...nel.org>,
        Josef Schlehofer <josef.schlehofer@....cz>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org
Subject: Re: [PATCH] powerpc: dts: turris1x.dts: Add channel labels for
 temperature sensor

On Tuesday 29 November 2022 12:18:28 Michael Ellerman wrote:
> Pali Rohár <pali@...nel.org> writes:
> > Michael, could you take this patch?
> 
> Yep.
> 
> With these dts patches it always helps if you tell me that it passes the
> DT schema checks, so that I don't get yelled at by the DT people :)

Mostly dt schemas for p1/p2 are incomplete, I sent more patches but they
are waiting and I was not able to setup & run dt schema checker. Hence
I tested everything on the hardware to ensure that it works correctly.
And this patch works on Turris 1.1 board, I also tested sensors tool.
So the important is what is in DTS file, the stuff which is used on HW.

> cheers
> 
> > On Sunday 09 October 2022 14:05:06 Pali Rohár wrote:
> >> On Friday 30 September 2022 14:46:18 Pali Rohár wrote:
> >> > + CC hwmon ML
> >> > 
> >> > On Friday 30 September 2022 14:39:01 Pali Rohár wrote:
> >> > > Channel 0 of SA56004ED chip refers to internal SA56004ED chip sensor (chip
> >> > > itself is located on the board) and channel 1 of SA56004ED chip refers to
> >> > > external sensor which is connected to temperature diode of the P2020 CPU.
> >> > > 
> >> > > Fixes: 54c15ec3b738 ("powerpc: dts: Add DTS file for CZ.NIC Turris 1.x routers")
> >> > > Signed-off-by: Pali Rohár <pali@...nel.org>
> >> > > ---
> >> > > With this change userspace 'sensors' applications prints labels:
> >> > > 
> >> > >     $ sensors
> >> > >     sa56004-i2c-0-4c
> >> > >     Adapter: MPC adapter (i2c@...0)
> >> > >     board:        +34.2°C  (low  =  +0.0°C, high = +70.0°C)
> >> > >                            (crit = +85.0°C, hyst = +75.0°C)
> >> > >     cpu:          +58.9°C  (low  =  +0.0°C, high = +70.0°C)
> >> > >                            (crit = +85.0°C, hyst = +75.0°C)
> >> > > 
> >> > > And without this change it prints just generic tempX names:
> >> > > 
> >> > >     $ sensors
> >> > >     sa56004-i2c-0-4c
> >> > >     Adapter: MPC adapter (i2c@...0)
> >> > >     temp1:        +43.0°C  (low  =  +0.0°C, high = +70.0°C)
> >> > >                            (crit = +85.0°C, hyst = +75.0°C)
> >> > >     temp2:        +63.4°C  (low  =  +0.0°C, high = +70.0°C)
> >> > >                            (crit = +85.0°C, hyst = +75.0°C)
> >> > > ---
> >> > >  arch/powerpc/boot/dts/turris1x.dts | 14 ++++++++++++++
> >> > >  1 file changed, 14 insertions(+)
> >> > > 
> >> > > diff --git a/arch/powerpc/boot/dts/turris1x.dts b/arch/powerpc/boot/dts/turris1x.dts
> >> > > index 4033c554b06a..5b5278c32e43 100644
> >> > > --- a/arch/powerpc/boot/dts/turris1x.dts
> >> > > +++ b/arch/powerpc/boot/dts/turris1x.dts
> >> > > @@ -69,6 +69,20 @@
> >> > >  				interrupt-parent = <&gpio>;
> >> > >  				interrupts = <12 IRQ_TYPE_LEVEL_LOW>, /* GPIO12 - ALERT pin */
> >> > >  					     <13 IRQ_TYPE_LEVEL_LOW>; /* GPIO13 - CRIT pin */
> >> > > +				#address-cells = <1>;
> >> > > +				#size-cells = <0>;
> >> > > +
> >> > > +				/* Local temperature sensor (SA56004ED internal) */
> >> > > +				channel@0 {
> >> > > +					reg = <0>;
> >> > > +					label = "board";
> >> > > +				};
> >> > > +
> >> > > +				/* Remote temperature sensor (D+/D- connected to P2020 CPU Temperature Diode) */
> >> > > +				channel@1 {
> >> > > +					reg = <1>;
> >> > > +					label = "cpu";
> >> > > +				};
> >> > 
> >> > I'm not sure if you want UPPERCASE, lowercase, PascalCase, kebab-case
> >> > or snake_case format of labels. Or if you want also "temp" or
> >> > "temperature" keyword in the label. So please adjust label to the
> >> > preferred one, if proposed format is not the correct.
> >> 
> >> Ok, if nobody complains then please take this patch as is.
> >> 
> >> > >  			};
> >> > >  
> >> > >  			/* DDR3 SPD/EEPROM */
> >> > > -- 
> >> > > 2.20.1
> >> > >