linux-kernel - [PATCH v2 2/2] arm64: dts: mediatek: mt8173: Fix timer 13 MHz clock description

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Date:   Wed, 15 Nov 2023 20:06:25 +0300
From:   Alper Nebi Yasak <alpernebiyasak@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mediatek@...ts.infradead.org,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chen-Yu Tsai <wenst@...omium.org>, linux-clk@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Alper Nebi Yasak <alpernebiyasak@...il.com>
Subject: [PATCH v2 2/2] arm64: dts: mediatek: mt8173: Fix timer 13 MHz clock description

A previous patch fixes an issue with the mt8173-infracfg clock driver
when working as a module, but has the side effect of skipping set up of
CLK_INFRA_CLK_13M in that case. This clock is used by the timer device.

Similar to the MT8183, MT8192, MT8195 and MT8186 cases [1], change the
input clock of the timer block a fixed factor divide-by-2 clock that
takes the 26 MHz oscillator as its input.

Also remove the RTC clock from the timer node while we're here. According
to commit 59311b19d7f63 ("clocksource/drivers/timer-mediatek: Add system
timer bindings") it is no longer used.

[1] https://lore.kernel.org/all/20221201084229.3464449-1-wenst@chromium.org/

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@...il.com>
---
Tested on a MT8173 Chromebook. But I'm not sure I understand all of
this, so review with a pinch of salt.

Do we need to remove CLK_INFRA_CLK_13M from mt8173-infracfg after this?

Changes in v2:
- Add this patch

 arch/arm64/boot/dts/mediatek/mt8173.dtsi | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
index c47d7d900f28..9062ca124d69 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
@@ -244,6 +244,15 @@ psci {
 		cpu_on	 = <0x84000003>;
 	};
 
+	clk13m: fixed-factor-clock-13m {
+		compatible = "fixed-factor-clock";
+		#clock-cells = <0>;
+		clocks = <&clk26m>;
+		clock-div = <2>;
+		clock-mult = <1>;
+		clock-output-names = "clk13m";
+	};
+
 	clk26m: oscillator0 {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
@@ -530,8 +539,7 @@ timer: timer@...08000 {
 				     "mediatek,mt6577-timer";
 			reg = <0 0x10008000 0 0x1000>;
 			interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_LOW>;
-			clocks = <&infracfg CLK_INFRA_CLK_13M>,
-				 <&topckgen CLK_TOP_RTC_SEL>;
+			clocks = <&clk13m>;
 		};
 
 		pwrap: pwrap@...0d000 {
-- 
2.42.0