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

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Date:   Fri, 30 Sep 2022 14:39:01 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Marek Behún <kabel@...nel.org>,
        Josef Schlehofer <josef.schlehofer@....cz>
Subject: [PATCH] powerpc: dts: turris1x.dts: Add channel labels for temperature sensor

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";
+				};
 			};
 
 			/* DDR3 SPD/EEPROM */
-- 
2.20.1