mainline/master bisection: baseline.dmesg.crit on qemu_arm-vexpress-a15

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mainline/master bisection: baseline.dmesg.crit on qemu_arm-vexpress-a15

Summary:
  Start:      cdd3bb54332f Merge tag 'm68knommu-for-v5.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
  Plain log:  https://storage.kernelci.org/mainline/master/v5.8-rc3-82-gcdd3bb54332f/arm/vexpress_defconfig/gcc-8/lab-cip/baseline-vexpress-v2p-ca15-tc1.txt
  HTML log:   https://storage.kernelci.org/mainline/master/v5.8-rc3-82-gcdd3bb54332f/arm/vexpress_defconfig/gcc-8/lab-cip/baseline-vexpress-v2p-ca15-tc1.html
  Result:     38ac46002d1d arm: dts: vexpress: Move mcc node back into motherboard node

Checks:
  revert:     PASS
  verify:     PASS

Parameters:
  Tree:       mainline
  URL:        https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  Branch:     master
  Target:     qemu_arm-vexpress-a15
  CPU arch:   arm
  Lab:        lab-cip
  Compiler:   gcc-8
  Config:     vexpress_defconfig
  Test case:  baseline.dmesg.crit

Breaking commit found:

-------------------------------------------------------------------------------
commit 38ac46002d1df5707566a73486452851341028d2
Author: Andre Przywara <andre.przywara@arm.com>
Date:   Wed Jun 3 17:22:37 2020 +0100

    arm: dts: vexpress: Move mcc node back into motherboard node
    
    Commit d9258898ad49 ("arm64: dts: arm: vexpress: Move fixed devices
    out of bus node") moved the "mcc" DT node into the root node, because
    it does not have any children using "reg" properties, so does violate
    some dtc checks about "simple-bus" nodes.
    
    However this broke the vexpress config-bus code, which walks up the
    device tree to find the first node with an "arm,vexpress,site" property.
    This gave the wrong result (matching the root node instead of the
    motherboard node), so broke the clocks and some other devices for
    VExpress boards.
    
    Move the whole node back into its original position. This re-introduces
    the dtc warning, but is conceptually the right thing to do. The dtc
    warning seems to be overzealous here, there are discussions on fixing or
    relaxing this check instead.
    
    Link: https://lore.kernel.org/r/20200603162237.16319-1-andre.przywara@arm.com
    Fixes: d9258898ad49 ("arm64: dts: vexpress: Move fixed devices out of bus node")
    Reported-and-tested-by: Guenter Roeck <linux@roeck-us.net>
    Signed-off-by: Andre Przywara <andre.przywara@arm.com>
    Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
index e6308fb76183..a88ee5294d35 100644
--- a/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
+++ b/arch/arm/boot/dts/vexpress-v2m-rs1.dtsi
@@ -100,79 +100,6 @@
 		};
 	};
 
-	mcc {
-		compatible = "arm,vexpress,config-bus";
-		arm,vexpress,config-bridge = <&v2m_sysreg>;
-
-		oscclk0 {
-			/* MCC static memory clock */
-			compatible = "arm,vexpress-osc";
-			arm,vexpress-sysreg,func = <1 0>;
-			freq-range = <25000000 60000000>;
-			#clock-cells = <0>;
-			clock-output-names = "v2m:oscclk0";
-		};
-
-		v2m_oscclk1: oscclk1 {
-			/* CLCD clock */
-			compatible = "arm,vexpress-osc";
-			arm,vexpress-sysreg,func = <1 1>;
-			freq-range = <23750000 65000000>;
-			#clock-cells = <0>;
-			clock-output-names = "v2m:oscclk1";
-		};
-
-		v2m_oscclk2: oscclk2 {
-			/* IO FPGA peripheral clock */
-			compatible = "arm,vexpress-osc";
-			arm,vexpress-sysreg,func = <1 2>;
-			freq-range = <24000000 24000000>;
-			#clock-cells = <0>;
-			clock-output-names = "v2m:oscclk2";
-		};
-
-		volt-vio {
-			/* Logic level voltage */
-			compatible = "arm,vexpress-volt";
-			arm,vexpress-sysreg,func = <2 0>;
-			regulator-name = "VIO";
-			regulator-always-on;
-			label = "VIO";
-		};
-
-		temp-mcc {
-			/* MCC internal operating temperature */
-			compatible = "arm,vexpress-temp";
-			arm,vexpress-sysreg,func = <4 0>;
-			label = "MCC";
-		};
-
-		reset {
-			compatible = "arm,vexpress-reset";
-			arm,vexpress-sysreg,func = <5 0>;
-		};
-
-		muxfpga {
-			compatible = "arm,vexpress-muxfpga";
-			arm,vexpress-sysreg,func = <7 0>;
-		};
-
-		shutdown {
-			compatible = "arm,vexpress-shutdown";
-			arm,vexpress-sysreg,func = <8 0>;
-		};
-
-		reboot {
-			compatible = "arm,vexpress-reboot";
-			arm,vexpress-sysreg,func = <9 0>;
-		};
-
-		dvimode {
-			compatible = "arm,vexpress-dvimode";
-			arm,vexpress-sysreg,func = <11 0>;
-		};
-	};
-
 	bus@8000000 {
 		motherboard-bus {
 			model = "V2M-P1";
@@ -435,6 +362,79 @@
 						};
 					};
 				};
+
+				mcc {
+					compatible = "arm,vexpress,config-bus";
+					arm,vexpress,config-bridge = <&v2m_sysreg>;
+
+					oscclk0 {
+						/* MCC static memory clock */
+						compatible = "arm,vexpress-osc";
+						arm,vexpress-sysreg,func = <1 0>;
+						freq-range = <25000000 60000000>;
+						#clock-cells = <0>;
+						clock-output-names = "v2m:oscclk0";
+					};
+
+					v2m_oscclk1: oscclk1 {
+						/* CLCD clock */
+						compatible = "arm,vexpress-osc";
+						arm,vexpress-sysreg,func = <1 1>;
+						freq-range = <23750000 65000000>;
+						#clock-cells = <0>;
+						clock-output-names = "v2m:oscclk1";
+					};
+
+					v2m_oscclk2: oscclk2 {
+						/* IO FPGA peripheral clock */
+						compatible = "arm,vexpress-osc";
+						arm,vexpress-sysreg,func = <1 2>;
+						freq-range = <24000000 24000000>;
+						#clock-cells = <0>;
+						clock-output-names = "v2m:oscclk2";
+					};
+
+					volt-vio {
+						/* Logic level voltage */
+						compatible = "arm,vexpress-volt";
+						arm,vexpress-sysreg,func = <2 0>;
+						regulator-name = "VIO";
+						regulator-always-on;
+						label = "VIO";
+					};
+
+					temp-mcc {
+						/* MCC internal operating temperature */
+						compatible = "arm,vexpress-temp";
+						arm,vexpress-sysreg,func = <4 0>;
+						label = "MCC";
+					};
+
+					reset {
+						compatible = "arm,vexpress-reset";
+						arm,vexpress-sysreg,func = <5 0>;
+					};
+
+					muxfpga {
+						compatible = "arm,vexpress-muxfpga";
+						arm,vexpress-sysreg,func = <7 0>;
+					};
+
+					shutdown {
+						compatible = "arm,vexpress-shutdown";
+						arm,vexpress-sysreg,func = <8 0>;
+					};
+
+					reboot {
+						compatible = "arm,vexpress-reboot";
+						arm,vexpress-sysreg,func = <9 0>;
+					};
+
+					dvimode {
+						compatible = "arm,vexpress-dvimode";
+						arm,vexpress-sysreg,func = <11 0>;
+					};
+				};
 			};
 		};
 	};
-------------------------------------------------------------------------------


Git bisection log:

-------------------------------------------------------------------------------
git bisect start
# good: [719fdd32921fb7e3208db8832d32ae1c2d68900f] afs: Fix storage of cell names
git bisect good 719fdd32921fb7e3208db8832d32ae1c2d68900f
# bad: [cdd3bb54332f82295ed90cd0c09c78cd0c0ee822] Merge tag 'm68knommu-for-v5.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
git bisect bad cdd3bb54332f82295ed90cd0c09c78cd0c0ee822
# bad: [f7db192b2d71ea42627a32349d59a5f99f2aafcc] Merge tag 'arm-omap-fixes-5.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
git bisect bad f7db192b2d71ea42627a32349d59a5f99f2aafcc
# good: [ae71d4bf0074a81cc04255c96e3de0a49b1d95fa] Merge tag 'perf-urgent-2020-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good ae71d4bf0074a81cc04255c96e3de0a49b1d95fa
# good: [d528945d7762be94beca4c111bb95dcc9a9f39c0] Merge tag 'omap-for-v5.8/fixes-rc1-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into arm/omap-fixes
git bisect good d528945d7762be94beca4c111bb95dcc9a9f39c0
# bad: [2596ce4b4ded685b67fed407aed2bfe6ebcc39cb] Merge tag 'arm-soc/for-5.8/drivers-fixes' of https://github.com/Broadcom/stblinux into arm/fixes
git bisect bad 2596ce4b4ded685b67fed407aed2bfe6ebcc39cb
# bad: [0f77ce26ebcf6ea384421d2dd47b924b83649692] Revert "ARM: sti: Implement dummy L2 cache's write_sec"
git bisect bad 0f77ce26ebcf6ea384421d2dd47b924b83649692
# bad: [d68ec1644dd546851d651787a638aead32a60a6f] Merge tag 'juno-fix-5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes
git bisect bad d68ec1644dd546851d651787a638aead32a60a6f
# bad: [38ac46002d1df5707566a73486452851341028d2] arm: dts: vexpress: Move mcc node back into motherboard node
git bisect bad 38ac46002d1df5707566a73486452851341028d2
# first bad commit: [38ac46002d1df5707566a73486452851341028d2] arm: dts: vexpress: Move mcc node back into motherboard node
-------------------------------------------------------------------------------