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arm64: dts: mediatek: mt8183: Fix systimer 13 MHz clock description

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[ Upstream commit ce8a06b5bac75ccce99c0cf91b96b767d64f28a7 ]

The systimer block derives its 13 MHz clock by dividing the main 26 MHz
oscillator clock by 2 internally, not through the TOPCKGEN clock
controller.

On the MT8183 this divider is set either by power-on-reset or by the
bootloader. The bootloader may then make the divider unconfigurable to,
but can be read out by, the operating system.

Making the systimer block take the 26 MHz clock directly requires
changing the implementations. As an ABI compatible fix, change the
input clock of the systimer block a fixed factor divide-by-2 clock
that takes the 26 MHz oscillator as its input.

Fixes: 5bc8e2875ffb ("arm64: dts: mt8183: add systimer0 device node")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20221201084229.3464449-2-wenst@chromium.org
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chen-Yu Tsai 2022-12-01 16:42:26 +08:00 committed by Greg Kroah-Hartman
parent 1cc12d10d1
commit e192005e3f
1 changed files with 10 additions and 2 deletions
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12
arch/arm64/boot/dts/mediatek/mt8183.dtsi
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@ -299,6 +299,15 @@
method = "smc";
};
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: oscillator {
compatible = "fixed-clock";
#clock-cells = <0>;
@ -610,8 +619,7 @@
"mediatek,mt6765-timer";
reg = <0 0x10017000 0 0x1000>;
interrupts = <GIC_SPI 200 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&topckgen CLK_TOP_CLK13M>;
clock-names = "clk13m";
clocks = <&clk13m>;
};
iommu: iommu@10205000 {