linux-kernel - [PATCH 5/7] arm64: dts: mediatek: mt6795: Add fixed clocks for 32kHz and 26MHz XOs

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Date:   Fri, 13 May 2022 19:16:15 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     robh+dt@...nel.org
Cc:     krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        konrad.dybcio@...ainline.org, marijn.suijten@...ainline.org,
        martin.botka@...ainline.org, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org, paul.bouchara@...ainline.org,
        kernel@...labora.com,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH 5/7] arm64: dts: mediatek: mt6795: Add fixed clocks for 32kHz and 26MHz XOs

Add the 32kHz and 26MHz oscillators as fixed clocks in devicetree to
provide a good initial clock spec, since this SoC features two always
on oscillators running at the aforementioned frequencies.
While at it, since the UART clock is actually referring to the 26MHz
oscillator, remove it and assign clk26m as "baud" clock for the UARTs.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 arch/arm64/boot/dts/mediatek/mt6795.dtsi | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt6795.dtsi b/arch/arm64/boot/dts/mediatek/mt6795.dtsi
index 363fa25b4edc..b6f7681cc151 100644
--- a/arch/arm64/boot/dts/mediatek/mt6795.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt6795.dtsi
@@ -142,21 +142,23 @@ l2_1: l2-cache1 {
 		};
 	};
 
-	system_clk: dummy13m {
+	clk26m: oscillator-26m {
 		compatible = "fixed-clock";
-		clock-frequency = <13000000>;
 		#clock-cells = <0>;
+		clock-frequency = <26000000>;
+		clock-output-names = "clk26m";
 	};
 
-	rtc_clk: dummy32k {
+	clk32k: oscillator-32k {
 		compatible = "fixed-clock";
-		clock-frequency = <32000>;
 		#clock-cells = <0>;
+		clock-frequency = <32000>;
+		clock-output-names = "clk32k";
 	};
 
-	uart_clk: dummy26m {
+	system_clk: dummy13m {
 		compatible = "fixed-clock";
-		clock-frequency = <26000000>;
+		clock-frequency = <13000000>;
 		#clock-cells = <0>;
 	};
 
@@ -221,7 +223,7 @@ uart0: serial@...02000 {
 				     "mediatek,mt6577-uart";
 			reg = <0 0x11002000 0 0x400>;
 			interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>;
-			clocks = <&uart_clk>;
+			clocks = <&clk26m>;
 			status = "disabled";
 		};
 
@@ -230,7 +232,7 @@ uart1: serial@...03000 {
 				     "mediatek,mt6577-uart";
 			reg = <0 0x11003000 0 0x400>;
 			interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_LOW>;
-			clocks = <&uart_clk>;
+			clocks = <&clk26m>;
 			status = "disabled";
 		};
 
@@ -239,7 +241,7 @@ uart2: serial@...04000 {
 				     "mediatek,mt6577-uart";
 			reg = <0 0x11004000 0 0x400>;
 			interrupts = <GIC_SPI 93 IRQ_TYPE_LEVEL_LOW>;
-			clocks = <&uart_clk>;
+			clocks = <&clk26m>;
 			status = "disabled";
 		};
 
@@ -248,7 +250,7 @@ uart3: serial@...05000 {
 				     "mediatek,mt6577-uart";
 			reg = <0 0x11005000 0 0x400>;
 			interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_LOW>;
-			clocks = <&uart_clk>;
+			clocks = <&clk26m>;
 			status = "disabled";
 		};
 	};
-- 
2.35.1