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arm64: imx8mp: Inhibit DTC warning on DH i.MX8MP DHCOM rev.100 DTO

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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 <festevam@denx.de>
Reported-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Tested-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
This commit is contained in:
Marek Vasut 2023-11-05 01:04:32 +01:00 committed by Fabio Estevam
parent 27089f1e4d
commit 4a03cf38d8
1 changed files with 2 additions and 0 deletions
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2
arch/arm/dts/Makefile
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@ -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))
@: