linux-kernel - [PATCH v8 5/6] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it

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Message-Id: <20220211191238.2142-6-kabel@kernel.org>
Date:   Fri, 11 Feb 2022 20:12:37 +0100
From:   Marek Behún <kabel@...nel.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gregory Clement <gregory.clement@...tlin.com>
Cc:     Pali Rohár <pali@...nel.org>,
        linux-clk@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Marek Behún <kabel@...nel.org>
Subject: [PATCH v8 5/6] arm64: dts: marvell: armada-37xx: add device node for UART clock and use it

From: Pali Rohár <pali@...nel.org>

Define 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>
Reviewed-by: Marek Behún <kabel@...nel.org>
Signed-off-by: Marek Behún <kabel@...nel.org>
---
Changes since v7:
- changed commit message ("This change defines" -> "Define")
- added Marek's Reviewed-by tag
---
 arch/arm64/boot/dts/marvell/armada-37xx.dtsi | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
index 673f4906eef9..4cf6c8aa0ac2 100644
--- a/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
+++ b/arch/arm64/boot/dts/marvell/armada-37xx.dtsi
@@ -132,10 +132,20 @@ avs: avs@...00 {
 				reg = <0x11500 0x40>;
 			};
 
+			uartclk: clock-controller@...10 {
+				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>;
+			};
+
 			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 +157,7 @@ uart0: serial@...00 {
 			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>;
-- 
2.34.1