linux-kernel - [PATCH v5 7/9] ARM: dts: stm32: add Hardware debug port (HDP) on stm32mp25

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Message-ID: <20250613-hdp-upstream-v5-7-6fd6f0dc527c@foss.st.com>
Date: Fri, 13 Jun 2025 12:14:18 +0200
From: Clément Le Goffic <clement.legoffic@...s.st.com>
To: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Bartosz Golaszewski <brgl@...ev.pl>
CC: <linux-kernel@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Clément Le Goffic
	<clement.legoffic@...s.st.com>
Subject: [PATCH v5 7/9] ARM: dts: stm32: add Hardware debug port (HDP) on
 stm32mp25

Add the hdp devicetree node for stm32mp25 SoC family

Keep the node disabled as HDP needs the pinctrl SoC configuration to be
able to output its mux output signal outside of the SoC, on the SoC pad.
This configuration is provided in the board dtsi file through 'pinctrl-*'
properties as well as HDP mux configuration.
Thus, if needed, HDP should be enabled in board dtsi file.

Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
---
 arch/arm64/boot/dts/st/stm32mp251.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi
index 8d87865850a7..fa2b6a1881f2 100644
--- a/arch/arm64/boot/dts/st/stm32mp251.dtsi
+++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi
@@ -1148,6 +1148,13 @@ package_otp@1e8 {
 			};
 		};
 
+		hdp: pinctrl@...90000 {
+			compatible = "st,stm32mp251-hdp";
+			reg = <0x44090000 0x400>;
+			clocks = <&rcc CK_BUS_HDP>;
+			status = "disabled";
+		};
+
 		rcc: clock-controller@...00000 {
 			compatible = "st,stm32mp25-rcc";
 			reg = <0x44200000 0x10000>;

-- 
2.43.0