On Wed, Jun 16, 2021 at 11:06:30AM +0100, Andre Przywara wrote:

quoted

quoted

+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* 512KiB reserved for ARM Trusted Firmware (BL31) */
+		secmon_reserved: secmon@40000000 {
+			reg = <0x0 0x40000000 0x0 0x80000>;
+			no-map;
+		};
+	};  

Can't this be added by ATF directly?

It actually is, and if you use U-Boot's DT ($fdtcontroladdr), that
actually works. But as it stands right now, U-Boot fails to propagate
this to any DTB that gets *loaded*. Fixing this requires generic code
fixes, so I can't just hack this in for sunxi quickly.
So I wanted to keep this around for a while, as missing this is a
showstopper for booting Linux.

It looks like we didn't need it for the H6, what makes it any different?

quoted

quoted

+		mmc0: mmc@4020000 {
+			compatible = "allwinner,sun50i-h616-mmc",
+				     "allwinner,sun50i-a100-mmc";
+			reg = <0x04020000 0x1000>;
+			clocks = <&ccu CLK_BUS_MMC0>, <&ccu CLK_MMC0>;
+			clock-names = "ahb", "mmc";
+			resets = <&ccu RST_BUS_MMC0>;
+			reset-names = "ahb";
+			interrupts = <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
+			pinctrl-names = "default";
+			pinctrl-0 = <&mmc0_pins>;
+			status = "disabled";
+			max-frequency = <150000000>;
+			cap-sd-highspeed;
+			cap-mmc-highspeed;
+			mmc-ddr-3_3v;
+			mmc-ddr-1_8v;  

This is not something you know in the DTSI? It entirely depends on how
the board has been designed.

Are you referring just to the last property?

Initially, yes, but the argument is for both...

This is copying what the driver unconditionally sets for the other
SoCs at the moment (minus the H5 screwup):
	mmc->caps      |= MMC_CAP_1_8V_DDR | MMC_CAP_3_3V_DDR;
IIUC 1.8V operation requires a 1.8V regulator for vqmmc to actually
work, so this property alone won't enable anything.
But if it's just about the 1.8V property, I can of course move this to
the board dts files.

... Since we've seen boards with only 3.3v or 1.8v wired to vqmmc, so we
should really just push this to the boards for new SoCs

Maxime