linux-kernel - [PATCH v3 4/5] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it

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Message-Id: <20210717123829.5201-5-pali@kernel.org>
Date:   Sat, 17 Jul 2021 14:38:28 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Andrew Lunn" <andrew@...n.ch>,
        "Gregory Clement" <gregory.clement@...tlin.com>,
        "Sebastian Hesselbarth" <sebastian.hesselbarth@...il.com>,
        "Vladimir Vid" <vladimir.vid@...tura.hr>,
        Marek Behún <kabel@...nel.org>,
        "Geert Uytterhoeven" <geert@...ux-m68k.org>,
        linux-clk@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 4/5] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it

This change defines DT node for UART clock "marvell,armada-3700-uart-clock"
and use this UART clock as a base clock for all UART devices.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 arch/arm64/boot/dts/marvell/armada-3720-db.dts    |  4 ++++
 .../boot/dts/marvell/armada-3720-espressobin.dtsi |  4 ++++
 .../boot/dts/marvell/armada-3720-turris-mox.dts   |  4 ++++
 arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts  |  4 ++++
 arch/arm64/boot/dts/marvell/armada-37xx.dtsi      | 15 +++++++++++++--
 5 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/marvell/armada-3720-db.dts b/arch/arm64/boot/dts/marvell/armada-3720-db.dts
index 3e5789f37206..accf014a6a1e 100644
--- a/arch/arm64/boot/dts/marvell/armada-3720-db.dts
+++ b/arch/arm64/boot/dts/marvell/armada-3720-db.dts
@@ -191,6 +191,10 @@
 	};
 };
 
+&uartclk {
+	status = "okay";
+};
+
 /*
  * Exported on the micro USB connector CON30(V2.0)/CON32(V1.4) through
  * an FTDI (also on CON24(V2.0)/CON26(V1.4)).
diff --git a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dtsi b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dtsi
index 5fc613d24151..d03c7cdfbfb3 100644
--- a/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-3720-espressobin.dtsi
@@ -117,6 +117,10 @@
 	};
 };
 
+&uartclk {
+	status = "okay";
+};
+
 /* Exported on the micro USB connector J5 through an FTDI */
 &uart0 {
 	pinctrl-names = "default";
diff --git a/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts b/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
index ce2bcddf396f..724b41cca3b6 100644
--- a/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
+++ b/arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts
@@ -137,6 +137,10 @@
 	status = "disabled";
 };
 
+&uartclk {
+	status = "okay";
+};
+
 &uart0 {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts b/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
index 95d46e8d081c..c8217440b8dd 100644
--- a/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
+++ b/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
@@ -183,6 +183,10 @@
 	phy-names = "usb2-utmi-otg-phy";
 };
 
+&uartclk {
+	status = "okay";
+};
+
 &uart0 {
 	status = "okay";
 };
diff --git a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
index 5db81a416cd6..d62bf4a798d9 100644
--- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
@@ -132,10 +132,21 @@
 				reg = <0x11500 0x40>;
 			};
 
+			uartclk: uartclk@...00 {
+				compatible = "marvell,armada-3700-uart-clock";
+				reg = <0x12010 0x4>, <0x12210 0x4>;
+				clocks = <&tbg 0>, <&tbg 1>, <&tbg 2>,
+					<&tbg 3>, <&xtalclk>;
+				clock-names = "TBG-A-P", "TBG-B-P", "TBG-A-S",
+					"TBG-B-S", "xtal";
+				#clock-cells = <1>;
+				status = "disabled";
+			};
+
 			uart0: serial@...00 {
 				compatible = "marvell,armada-3700-uart";
 				reg = <0x12000 0x18>;
-				clocks = <&xtalclk>;
+				clocks = <&uartclk 0>;
 				interrupts =
 				<GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>,
 				<GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>,
@@ -147,7 +158,7 @@
 			uart1: serial@...00 {
 				compatible = "marvell,armada-3700-uart-ext";
 				reg = <0x12200 0x30>;
-				clocks = <&xtalclk>;
+				clocks = <&uartclk 1>;
 				interrupts =
 				<GIC_SPI 30 IRQ_TYPE_EDGE_RISING>,
 				<GIC_SPI 31 IRQ_TYPE_EDGE_RISING>;
-- 
2.20.1