linux-kernel - [PATCH 2/2] ARM: dts: stm32: remove timer5 duplicate unit-address on stm32f7 series

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Message-ID: <1644403729-22665-3-git-send-email-fabrice.gasnier@foss.st.com>
Date:   Wed, 9 Feb 2022 11:48:49 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...s.st.com>
To:     <alexandre.torgue@...s.st.com>, <robh+dt@...nel.org>
CC:     <olivier.moysan@...s.st.com>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <fabrice.gasnier@...s.st.com>
Subject: [PATCH 2/2] ARM: dts: stm32: remove timer5 duplicate unit-address on stm32f7 series

Remove the following warnings seen when building with W=1.
Warning (unique_unit_address): /soc/timer@...00c00: duplicate unit-address
(also used in node /soc/timers@...00c00)
This approach is based on some discussions[1], to restructure the dtsi
and dts files.

Timer5 is enabled by default on stm32f7 series, to act as clockevent. In
order to get rid of the W=1 warning, and be compliant with dt-schemas
(e.g. dtbs_check):
- In stm32f746.dtsi:
  . Keep the more complete timers5 description
  . Remove the most simple timer5 node that is duplicate
- In each board:
  . adopt "st,stm32-timer" compatible for timers5, also add the interrupt
  . use /delete-property/ and /delete-node/ so the it matches the
    clockevent bindings

Note: all this is done in one shot (e.g. not split) to keep clockevent
functionality.

[1] https://lore.kernel.org/linux-arm-kernel/Yaf4jiZIp8+ndaXs@robh.at.kernel.org/

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
---
 arch/arm/boot/dts/stm32746g-eval.dts  | 12 ++++++++++++
 arch/arm/boot/dts/stm32f746-disco.dts | 12 ++++++++++++
 arch/arm/boot/dts/stm32f746.dtsi      |  7 -------
 arch/arm/boot/dts/stm32f769-disco.dts | 12 ++++++++++++
 4 files changed, 36 insertions(+), 7 deletions(-)

diff --git a/arch/arm/boot/dts/stm32746g-eval.dts b/arch/arm/boot/dts/stm32746g-eval.dts
index 327613f..a293e651 100644
--- a/arch/arm/boot/dts/stm32746g-eval.dts
+++ b/arch/arm/boot/dts/stm32746g-eval.dts
@@ -194,6 +194,18 @@
 	bus-width = <4>;
 };
 
+&timers5 {
+	/* Override timer5 to act as clockevent */
+	compatible = "st,stm32-timer";
+	interrupts = <50>;
+	status = "okay";
+	/delete-property/#address-cells;
+	/delete-property/#size-cells;
+	/delete-property/clock-names;
+	/delete-node/pwm;
+	/delete-node/timer@4;
+};
+
 &usart1 {
 	pinctrl-0 = <&usart1_pins_a>;
 	pinctrl-names = "default";
diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts
index 569d23c..c11616e 100644
--- a/arch/arm/boot/dts/stm32f746-disco.dts
+++ b/arch/arm/boot/dts/stm32f746-disco.dts
@@ -109,6 +109,18 @@
 	bus-width = <4>;
 };
 
+&timers5 {
+	/* Override timer5 to act as clockevent */
+	compatible = "st,stm32-timer";
+	interrupts = <50>;
+	status = "okay";
+	/delete-property/#address-cells;
+	/delete-property/#size-cells;
+	/delete-property/clock-names;
+	/delete-node/pwm;
+	/delete-node/timer@4;
+};
+
 &usart1 {
 	pinctrl-0 = <&usart1_pins_b>;
 	pinctrl-names = "default";
diff --git a/arch/arm/boot/dts/stm32f746.dtsi b/arch/arm/boot/dts/stm32f746.dtsi
index a4f5c6a..dc868e6 100644
--- a/arch/arm/boot/dts/stm32f746.dtsi
+++ b/arch/arm/boot/dts/stm32f746.dtsi
@@ -141,13 +141,6 @@
 			};
 		};
 
-		timer5: timer@...00c00 {
-			compatible = "st,stm32-timer";
-			reg = <0x40000c00 0x400>;
-			interrupts = <50>;
-			clocks = <&rcc 0 STM32F7_APB1_CLOCK(TIM5)>;
-		};
-
 		timers5: timers@...00c00 {
 			#address-cells = <1>;
 			#size-cells = <0>;
diff --git a/arch/arm/boot/dts/stm32f769-disco.dts b/arch/arm/boot/dts/stm32f769-disco.dts
index be943b7..b038d0e 100644
--- a/arch/arm/boot/dts/stm32f769-disco.dts
+++ b/arch/arm/boot/dts/stm32f769-disco.dts
@@ -137,6 +137,18 @@
 	bus-width = <4>;
 };
 
+&timers5 {
+	/* Override timer5 to act as clockevent */
+	compatible = "st,stm32-timer";
+	interrupts = <50>;
+	status = "okay";
+	/delete-property/#address-cells;
+	/delete-property/#size-cells;
+	/delete-property/clock-names;
+	/delete-node/pwm;
+	/delete-node/timer@4;
+};
+
 &usart1 {
 	pinctrl-0 = <&usart1_pins_a>;
 	pinctrl-names = "default";
-- 
2.7.4