linux-kernel - [PATCH] arm: dts: Add am335x-boneblack-pps.dts

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Date:   Fri, 28 Apr 2023 12:54:53 +0200
From:   Julien Panis <jpanis@...libre.com>
To:     arnd@...db.de, olof@...om.net, soc@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, tony@...mide.com
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: [PATCH] arm: dts: Add am335x-boneblack-pps.dts

From: Lokesh Vutla <lokeshvutla@...com>

Add a new am335x-boneblack-pps.dts that can be used to configure TIMER7
in PWM mode. This PWM signal can be used as a PPS signal when
synchronized to PTP clock. Typically this synchronization is done by a
userspace program. This PPS signal can be observed on pin P8.8.

Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
Signed-off-by: Adrien Ricciardi <aricciardi@...libre.com>
Signed-off-by: Julien Panis <jpanis@...libre.com>
---
 arch/arm/boot/dts/Makefile                 |  1 +
 arch/arm/boot/dts/am335x-boneblack-pps.dts | 25 ++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 arch/arm/boot/dts/am335x-boneblack-pps.dts

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index efe4152e5846..d74158aae72d 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -939,6 +939,7 @@ dtb-$(CONFIG_SOC_AM33XX) += \
 	am335x-base0033.dtb \
 	am335x-bone.dtb \
 	am335x-boneblack.dtb \
+	am335x-boneblack-pps.dtb \
 	am335x-boneblack-wireless.dtb \
 	am335x-boneblue.dtb \
 	am335x-bonegreen.dtb \
diff --git a/arch/arm/boot/dts/am335x-boneblack-pps.dts b/arch/arm/boot/dts/am335x-boneblack-pps.dts
new file mode 100644
index 000000000000..88d2bc3fd759
--- /dev/null
+++ b/arch/arm/boot/dts/am335x-boneblack-pps.dts
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include "am335x-boneblack.dts"
+
+&am33xx_pinmux {
+	pwm7_pins: pinmux_pwm7_pins {
+		pinctrl-single,pins = <
+			AM33XX_PADCONF(AM335X_PIN_GPMC_OEN_REN, PIN_OUTPUT_PULLDOWN, MUX_MODE2)
+		>;
+	};
+};
+
+/{
+	pwm7: dmtimer-pwm7 {
+		compatible = "ti,omap-dmtimer-pwm";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pwm7_pins>;
+		#pwm-cells = <3>;
+		ti,timers = <&timer7>;
+		ti,clock-source = <0x00>; /* timer_sys_ck */
+	};
+};

base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6
-- 
2.37.3