linux-kernel - [PATCH 6/7] ARM: dts: exynos: k3g: Document the devices which are not supported

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Message-ID: <20230716220644.22158-8-markuss.broks@gmail.com>
Date:   Mon, 17 Jul 2023 01:05:08 +0300
From:   Markuss Broks <markuss.broks@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Markuss Broks <markuss.broks@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/7] ARM: dts: exynos: k3g: Document the devices which are not supported

Add placeholders for peripherals which we currently lack support for.
This includes Maxim MAX86900 heart rate sensor and oximeter, which
seems to be similar to other health sensors by Maxim, but it is not
fully compatible; STM32F401 MCU which acts like a sensor hub,
which can be flashed and controlled via the SPI bus, for which I made
some simple firmware to check if it's possible to program with custom
code, and it appears you can do so, but at the moment kernel lacks
the APIs to either control sensors directly through the MCU or any
standards for a sensor hub, so it's laid off; WM5110 audio codec which
fails to communicate for some reason.

Signed-off-by: Markuss Broks <markuss.broks@...il.com>
---
 arch/arm/boot/dts/exynos5422-samsung-k3g.dts | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5422-samsung-k3g.dts b/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
index 813dbf0438de..e019b630db94 100644
--- a/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
+++ b/arch/arm/boot/dts/exynos5422-samsung-k3g.dts
@@ -743,6 +743,24 @@ rmi4-f12@12 {
 	};
 };

+&i2c_3 {
+	status = "okay";
+
+	/* Maxim MAX86900 heart rate sensor and oximeter on address 0x57 */
+};
+
+&spi_0 {
+	status = "okay";
+
+	/* STMicroelectronics STM32F401 MCU to which sensors are connected */
+};
+
+&spi_2 {
+	status = "okay";
+
+	/* Wolfson WM5110 audio codec */
+};
+
 /* eMMC flash */
 &mmc_0 {
 	status = "okay";
-- 
2.41.0