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Date: Mon, 31 Aug 2015 09:25:30 +0200
From: Sascha Hauer <s.hauer@...gutronix.de>
To: Daniel Kurtz <djkurtz@...omium.org>
Cc: Punit Agrawal <punit.agrawal@....com>, linux-pm@...r.kernel.org,
Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-mediatek@...ts.infradead.org,
Sasha Hauer <kernel@...gutronix.de>,
Matthias Brugger <matthias.bgg@...il.com>,
"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/3] dt-bindings: thermal: Add binding document for
Mediatek thermal controller
On Fri, Aug 28, 2015 at 10:23:15AM +0800, Daniel Kurtz wrote:
> On Thu, Aug 27, 2015 at 7:49 PM, Punit Agrawal <punit.agrawal@....com> wrote:
> > [ + device tree folks ]
> >
> > Hi Sascha,
> >
> > When introducing a new binding, it is a good idea to get reviews from
> > the device tree maintainers. I've added a few folks here. Please keep
> > them in the loop for future postings.
> >
> > Sascha Hauer <s.hauer@...gutronix.de> writes:
> >
> >> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> >> Reviewed-by: Daniel Kurtz <djkurtz@...omium.org>
> >
> > Please add a commit log.
> >
> >> ---
> >> .../bindings/thermal/mediatek-thermal.txt | 38 ++++++++++++++++++++++
> >> include/dt-bindings/thermal/mt8173.h | 13 ++++++++
> >> 2 files changed, 51 insertions(+)
> >> create mode 100644 Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
> >> create mode 100644 include/dt-bindings/thermal/mt8173.h
> >>
> >> diff --git a/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt b/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
> >> new file mode 100644
> >> index 0000000..1697375
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
> >> @@ -0,0 +1,38 @@
> >> +* Mediatek Thermal
> >> +
> >> +This describes the device tree binding for the Mediatek thermal controller
> >> +which measures the on-SoC temperatures. This device does not have its own ADC,
> >> +instead it directly controls the AUXADC via AHB bus accesses. For this reason
> >> +this device needs phandles to the AUXADC. Also it controls a mux in the
> >> +apmixedsys register space via AHB bus accesses, so a phandle to the APMIXEDSYS
> >> +is also needed.
> >> +
> >> +Required properties:
> >> +- compatible: "mediatek,mt8173-thermal"
> >> +- reg: Address range of the thermal controller
> >> +- interrupts: IRQ for the thermal controller
> >> +- clocks, clock-names: Clocks needed for the thermal controller. required
> >> + clocks are:
> >> + "therm": Main clock needed for register access
> >> + "auxadc": The AUXADC clock
> >> +- resets: Reference to the reset controller controlling the thermal controller.
> >> +- mediatek,auxadc: A phandle to the AUXADC which the thermal controller uses
> >> +- mediatek,apmixedsys: A phandle to the APMIXEDSYS controller.
> >> +- #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description. See
> >> + include/dt-bindings/thermal/mt8173.h for valid sensor
> >> + numbers.
> >> +
> >> +Example:
> >> +
> >> + thermal: thermal@...0b000 {
> >> + #thermal-sensor-cells = <1>;
> >> + compatible = "mediatek,mt8173-thermal";
> >> + reg = <0 0x1100b000 0 0x1000>;
> >> + interrupts = <0 70 IRQ_TYPE_LEVEL_LOW>;
> >> + clocks = <&pericfg CLK_PERI_THERM>, <&pericfg CLK_PERI_AUXADC>;
> >> + clock-names = "therm", "auxadc";
> >> + resets = <&pericfg MT8173_PERI_THERM_SW_RST>;
> >> + reset-names = "therm";
> >> + mediatek,auxadc = <&auxadc>;
> >> + mediatek,apmixedsys = <&apmixedsys>;
> >> + };
> >> diff --git a/include/dt-bindings/thermal/mt8173.h b/include/dt-bindings/thermal/mt8173.h
> >> new file mode 100644
> >> index 0000000..692e74c
> >> --- /dev/null
> >> +++ b/include/dt-bindings/thermal/mt8173.h
> >> @@ -0,0 +1,13 @@
> >> +/*
> >> + * This header provides constants for mediatek,mt8173-thermal
> >> + */
> >> +
> >> +#ifndef _DT_BINDINGS_THERMAL_MEDIATEK_MT8173_H
> >> +#define _DT_BINDINGS_THERMAL_MEDIATEK_MT8173_H
> >> +
> >> +#define MT8173_THERMAL_ZONE_CA53 0
> >> +#define MT8173_THERMAL_ZONE_CA57 1
> >> +#define MT8173_THERMAL_ZONE_GPU 2
> >> +#define MT8173_THERMAL_ZONE_CORE 3
> >> +
> >> +#endif /* _DT_BINDINGS_THERMAL_MEDIATEK_MT8173_H */
> >
> > The constants in this include are not used in the patchset. Please drop
> > this hunk and introduce it when you use it.
>
> These constants are part of the devicetree ABI, and I believe they
> should be included with the binding.
Yes, that's what I was told for other series.
> To make this more concrete, I think these constants could be used as
> array indices when initializing the corresponding banks of "bank_data"
> in patch 2 (like you do when initializing scp_domain_data in the
> scpsys driver).
Good idea, will do that in the next round.
Sascha
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