On 8/24/22 07:51, Alexander Stein wrote:

Hello Marek,

Hi,

Am Dienstag, 23. August 2022, 18:56:02 CEST schrieb Marek Vasut:

quoted

Add SNVS LPGPR bindings to MX8M Plus, the LPGPR is used to store
e.g. boot counter.

[...]

quoted

diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi

b/arch/arm64/boot/dts/freescale/imx8mp.dtsi index
f7adcb2c14880..21689e9e68170 100644

--- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi

@@ -478,6 +478,11 @@ snvs_pwrkey: snvs-powerkey {
  					wakeup-source;
  					status = "disabled";
  				};
+
+				snvs_lpgpr: snvs-lpgpr {
+					compatible =

"fsl,imx8mp-snvs-lpgpr",

quoted

+						

"fsl,imx7d-snvs-lpgpr";

quoted

+				};
  			};

  			clk: clock-controller@30380000 {

Do you have any information that the i.MX8M Plus actually has the HPLR
register (at offset 0)? This is used in snvs_lpgpr_write. I can't find it in
the RM, although GPR_SL is referenced in LPGPRx register description.

It seems the HPLR is only documented in the Security RM (MX8MMSRM, 
MX8MPSRM etc), not in the regular RM (MX8MMRM, MX8MPRM etc) . So it 
seems the register does exist, including the soft lock bit, it is only 
omitted from the plain RM.

(also, sorry for the delayed reply)