linux-kernel - [PATCH] ARM: dts: imx: tqma7: add lm75a sensor (rev. 01xxx)

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Message-ID: <20231027211548.21a6cee7@pcn112>
Date:   Fri, 27 Oct 2023 21:15:48 +0200
From:   jrodrigues <jrodrigues@...met.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, jrodrigues@...met.com
Subject: [PATCH] ARM: dts: imx: tqma7: add lm75a sensor (rev. 01xxx)

TQMa7x (revision 01xxx) uses a different (LM75A) temperature sensor.
The two sensors use different I2C address, so we can set both sensors
simultaneously.

Signed-off-by: João Rodrigues <jrodrigues@...met.com>
---
 arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi b/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi
index fe42b0a468..b87560d037 100644
--- a/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx7-tqma7.dtsi
@@ -128,7 +128,14 @@ vgen6_reg: vldo4 {
 		};
 	};

-	/* NXP SE97BTP with temperature sensor + eeprom */
+	/* LM75A - temperature sensor, TQMa7x 01xx */
+	lm75a: temperature-sensor@48 {
+		compatible = "national,lm75a";
+		reg = <0x48>;
+		status = "okay";
+	};
+
+	/* NXP SE97BTP with temperature sensor + eeprom, TQMa7x 02xx */
 	se97b: temperature-sensor-eeprom@1e {
 		compatible = "nxp,se97b", "jedec,jc-42.4-temp";
 		reg = <0x1e>;
--

The differences in the ICs are shown here:
The TQMa7 manual only references the latest version
https://www.tq-group.com/filedownloads/files/products/embedded/manuals/arm/embedded-modul/TQ-Socket/TQMa7x/TQMa7x.UM.0203.pdf
in section 3.2.4, while the board manual
https://www.tq-group.com/filedownloads/files/products/embedded/manuals/arm/carrierboard/MBa7x/MBa7x.UM.0101.pdf
in section 4.1.2 references the old version, introduced by this patch.

I have tested this change in a board which uses the TQMa7x
module, and with this patch we always a temperature sensors available.

Best regards,

--
João Rodrigues <jrodrigues@...met.com>