linux-kernel - Re: [PATCH v2] arm64: dts: rockchip: add EEPROM node for NanoPi R4S

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Date:   Sun, 20 Jun 2021 00:11:12 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Rob Herring <robh+dt@...nel.org>, Tianling Shen <cnsztl@...il.com>,
        Pavel Machek <pavel@....cz>, Marty Jones <mj8263788@...il.com>,
        Jensen Huang <jensenhuang@...endlyarm.com>,
        Chen-Yu Tsai <wens@...e.org>, Tianling Shen <cnsztl@...il.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: rockchip: add EEPROM node for NanoPi R4S

Hi,

Am Donnerstag, 10. Juni 2021, 11:13:57 CEST schrieb Tianling Shen:
> NanoPi R4S has a EEPROM attached to the 2nd I2C bus (U92), which
> stores the MAC address.
> 
> Changes in v2:
> - Added the size of EEPROM
> - Added `mac-address` cell to pass the MAC address to kernel
> - Removed `read-only` property in EEPROM node
> 
> Signed-off-by: Tianling Shen <cnsztl@...il.com>

this produces errors when building the dtb:
  DTC     arch/arm64/boot/dts/rockchip/rk3399-rock-pi-4a.dtb
../arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts:84.4-22: Warning (reg_format): /i2c@...20000/eeprom@...mac-address@fa:reg: property has invalid length (8 bytes) (#address-cells == 2, #size-cells == 1)
arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtb: Warning (pci_device_bus_num): Failed prerequisite 'reg_format'
arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtb: Warning (i2c_bus_reg): Failed prerequisite 'reg_format'
arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtb: Warning (spi_bus_reg): Failed prerequisite 'reg_format'
../arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts:83.31-85.5: Warning (avoid_default_addr_size): /i2c@...20000/eeprom@...mac-address@fa: Relying on default #address-cells value
../arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts:83.31-85.5: Warning (avoid_default_addr_size): /i2c@...20000/eeprom@...mac-address@fa: Relying on default #size-cells value

in the eeprom node you'll need to define #address-cells and #size-cells
for this to work.

Thanks
Heiko


> ---
>  .../boot/dts/rockchip/rk3399-nanopi-r4s.dts    | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> index cef4d18b599d..50d3b11eb925 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
> @@ -68,6 +68,24 @@
>  	status = "disabled";
>  };
>  
> +&gmac {
> +	nvmem-cells = <&mac_address>;
> +	nvmem-cells-names = "mac-address";
> +};
> +
> +&i2c2 {
> +	eeprom@51 {
> +		compatible = "microchip,24c02", "atmel,24c02";
> +		reg = <0x51>;
> +		pagesize = <16>;
> +		size = <256>;
> +
> +		mac_address: mac-address@fa {
> +			reg = <0xfa 0x06>;
> +		};
> +	};
> +};
> +
>  &i2c4 {
>  	status = "disabled";
>  };
>