From 4a03cf38d8415d7126aa7af666dece562527de8b Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sun, 5 Nov 2023 01:04:32 +0100 Subject: [PATCH] arm64: imx8mp: Inhibit DTC warning on DH i.MX8MP DHCOM rev.100 DTO Inhibit DTC warning in imx8mp-dhcom-pdk3-overlay-rev100.dts: " arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dtbo: Warning (reg_format): /fragment@0/__overlay__:reg: property has invalid length (4 bytes) (#address-cells == 2, #size-cells == 1) arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dtbo: Warning (avoid_default_addr_size): /fragment@0/__overlay__: Relying on default #address-cells value arch/arm/dts/imx8mp-dhcom-pdk3-overlay-rev100.dtbo: Warning (avoid_default_addr_size): /fragment@0/__overlay__: Relying on default #size-cells value " The DTO overwrites the 'reg' property of an ethernet PHY and is only used on specific combination of old prototype SoM and old prototype PDK3 carrier board, which had incorrectly placed pull resistor, which made the PHY change its MDIO address in that specific combination and which is already fixed on production hardware. The DTO is implemented in this simple manner because if it contained a full MDIO bus node reference to define #address-cells and #size-cells, it would also require a full new copy of the PHY node, i.e. ethernet-phy@5 { ... reg = <5>; ... }, to avoid DTC warnings about mismatch between node unit and reg value. The node unit in SoM DT is ethernet-phy@7 { ... }; . This simpler approach avoids unnecessary duplication without adverse side effects. Reported-by: Fabio Estevam Reported-by: Sean Anderson Signed-off-by: Marek Vasut Tested-by: Sean Anderson Reviewed-by: Fabio Estevam --- arch/arm/dts/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile index 5fc888680b..9d28a485be 100644 --- a/arch/arm/dts/Makefile +++ b/arch/arm/dts/Makefile @@ -1510,6 +1510,8 @@ targets += $(dtb-y) # Add any required device tree compiler flags here DTC_FLAGS += -a 0x8 +DTC_FLAGS_imx8mp-dhcom-pdk3-overlay-rev100 += -Wno-avoid_default_addr_size -Wno-reg_format + PHONY += dtbs dtbs: $(addprefix $(obj)/, $(dtb-y)) @: -- 2.39.5