linux-kernel - [PATCH] arm64: dts: imx8mq: remove SoC ID compatible

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Date:   Tue,  9 Mar 2021 14:42:51 +0100
From:   Martin Kepplinger <martin.kepplinger@...i.sm>
To:     alice.guo@....nxp.com
Cc:     devicetree@...r.kernel.org, festevam@...il.com,
        kernel@...gutronix.de, krzk@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, robh@...nel.org,
        s.hauer@...gutronix.de, shawnguo@...nel.org,
        Martin Kepplinger <martin.kepplinger@...i.sm>
Subject: [PATCH] arm64: dts: imx8mq: remove SoC ID compatible

this reverts commit ce58459d8c7f4174e7b8a8ea903dd949631334a3 for imx8mq.

this is most likely not the real fix but works around the problem I have
(with v5.12-rc2) I want to report:

[    0.766925] SoC revision 0x21
[    0.770286] imx8_soc_info soc@0: SoC revision via nvmem read failed: -517

This leads to the system not booting up.

This change makes use of the old way of reading soc_revision and thus
works around the problem.

What could be missing for the nvmem way to work here? Should it work
in any case? I assume so if you add the compatible to imx8mq.dtsi. But
if it would work, why keep the ocotp reads?

thanks a lot,
                             martin


---
 arch/arm64/boot/dts/freescale/imx8mq.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index e1ca17fc1fa1..b40f7081e825 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -287,7 +287,7 @@ timer {
 	};
 
 	soc@0 {
-		compatible = "fsl,imx8mq-soc", "simple-bus";
+		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges = <0x0 0x0 0x0 0x3e000000>;
-- 
2.30.1