Re: [PATCH v2 4/4] arm64: dts: imx8mp: change AUDIO_AXI_CLK_ROOT freq. to 800MHz
From: Adam Ford <hidden>
Date: 2025-02-21 19:37:25
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imx, linux-clk, linux-devicetree, lkml
On Fri, Feb 21, 2025 at 1:11 PM Laurentiu Mihalcea [off-list ref] wrote:
From: Laurentiu Mihalcea <redacted> AUDIO_AXI_CLK_ROOT can't run at currently requested 600MHz w/ its parent SYS_PLL1 configured at 800MHz. Configure it to run at 800MHz as some applications running on the DSP expect the core to run at this frequency anyways. This change also affects the AUDIOMIX NoC.
Unless I am missing something, the i.MX 8M Plus Applications Processor Datasheet (rev 2.1) has a table of frequencies, and AUDIO_AXI_CLK_ROOT is shown to be 600MHz nominal and 800MHz for overdrive. I agree that it's likely not running at 600MHz now, but 800MHz may be out of spec for people who are using the nominal voltage instead of the overdrive, since overdrive requires higher voltages than the nominal. adam
quoted hunk ↗ jump to hunk
Fixes: b739681b3f8b ("arm64: dts: imx8mp: Fix SDMA2/3 clocks") Signed-off-by: Laurentiu Mihalcea <redacted> Reviewed-by: Iuliana Prodan <redacted> --- arch/arm64/boot/dts/freescale/imx8mp.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi index 86c3055789ba..54147bce3b83 100644 --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi@@ -834,7 +834,7 @@ pgc_audio: power-domain@5 { assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_800M>, <&clk IMX8MP_SYS_PLL1_800M>; assigned-clock-rates = <400000000>, - <600000000>; + <800000000>; }; pgc_gpu2d: power-domain@6 { --2.34.1