[PATCH next] rockchip: rk3588: insert u-boot,spl-boot-device into U-Boot device tree

[Quentin Schulz]

From: Quentin Schulz <quentin.schulz at theobroma-systems.com>

It is possible to boot U-Boot proper from a different storage medium
than the one used by the BOOTROM to load the SPL. This information is
stored in the u-boot,spl-boot-device Device Tree property and is
accessible from U-Boot proper so that it has knowledge at runtime where
it was loaded from.

Let's add support for this feature for rk3588 the same way it was done
for px30 and rk3399.

Cc: Quentin Schulz <foss+uboot at 0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz at theobroma-systems.com>
---
 arch/arm/mach-rockchip/rk3588/rk3588.c | 50 ++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/arch/arm/mach-rockchip/rk3588/rk3588.c b/arch/arm/mach-rockchip/rk3588/rk3588.c
index 18e67b5ca9b..694177e3976 100644
--- a/arch/arm/mach-rockchip/rk3588/rk3588.c
+++ b/arch/arm/mach-rockchip/rk3588/rk3588.c
@@ -162,3 +162,53 @@ int arch_cpu_init(void)
 	return 0;
 }
 #endif
+
+#if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD)
+const char *spl_decode_boot_device(u32 boot_device)
+{
+	int i;
+	static const struct {
+		u32 boot_device;
+		const char *ofpath;
+	} spl_boot_devices_tbl[] = {
+		{ BOOT_DEVICE_MMC2, "/mmc at fe2e0000" },
+		{ BOOT_DEVICE_MMC1, "/mmc at fe2c0000" },
+		{ BOOT_DEVICE_SPI, "/spi at fe2b0000/flash at 0" },
+	};
+
+	for (i = 0; i < ARRAY_SIZE(spl_boot_devices_tbl); ++i)
+		if (spl_boot_devices_tbl[i].boot_device == boot_device)
+			return spl_boot_devices_tbl[i].ofpath;
+
+	return NULL;
+}
+
+void spl_perform_fixups(struct spl_image_info *spl_image)
+{
+	void *blob = spl_image->fdt_addr;
+	const char *boot_ofpath;
+	int chosen;
+
+	/*
+	 * Inject the ofpath of the device the full U-Boot (or Linux in
+	 * Falcon-mode) was booted from into the FDT, if a FDT has been
+	 * loaded at the same time.
+	 */
+	if (!blob)
+		return;
+
+	boot_ofpath = spl_decode_boot_device(spl_image->boot_device);
+	if (!boot_ofpath) {
+		pr_err("%s: could not map boot_device to ofpath\n", __func__);
+		return;
+	}
+
+	chosen = fdt_find_or_add_subnode(blob, 0, "chosen");
+	if (chosen < 0) {
+		pr_err("%s: could not find/create '/chosen'\n", __func__);
+		return;
+	}
+	fdt_setprop_string(blob, chosen,
+			   "u-boot,spl-boot-device", boot_ofpath);
+}
+#endif

---
base-commit: 6735ab59e6fd71ced1c58d8dfb3dd6baf3690d16
change-id: 20230502-rk3588-spl-boot-dev-efa2777cc21b

Best regards,
-- 
Quentin Schulz <quentin.schulz at theobroma-systems.com>