arm: mvebu: Espressobin: Setup MTD partitions when booting kernel

Due to different partition layouts in different U-Boot versions, DTS for
Espressobin in Linux does not contain any definition of MTD partitions.
See commit https://git.kernel.org/stable/c/00954566464a4 for more details.

This patch via ft_board_setup() hook fills current partition layout used by
U-Boot, so booted kernel would see correct MTD partitions layout.

U-Boot env partition is calculated from CONFIG_ENV_OFFSET option.

First partition contains secure firmware, ARM trusted firmware and U-Boot
with checksums. So it is not possible to replace just one image (e.g.
U-Boot) without updating other parts where is stored checksum of U-Boot.
Therefore there is no extra partition defined for U-Boot and first
partition is called just 'firmware'.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Konstantin Porotchkin <kostap@marvell.com>
Tested-by: Andre Heider <a.heider@gmail.com>

board/Marvell/mvebu_armada-37xx/board.c

@@ -243,3 +243,103 @@ int board_network_enable(struct mii_dev *bus)
 
 	return 0;
 }
+
+#if defined(CONFIG_OF_BOARD_SETUP) && defined(CONFIG_ENV_IS_IN_SPI_FLASH)
+int ft_board_setup(void *blob, struct bd_info *bd)
+{
+	int ret;
+	int spi_off;
+	int parts_off;
+	int part_off;
+
+	/* Fill SPI MTD partitions for Linux kernel on Espressobin */
+	if (!of_machine_is_compatible("marvell,armada-3720-espressobin"))
+		return 0;
+
+	spi_off = fdt_node_offset_by_compatible(blob, -1, "jedec,spi-nor");
+	if (spi_off < 0)
+		return 0;
+
+	/* Do not touch partitions if they are already defined */
+	if (fdt_subnode_offset(blob, spi_off, "partitions") >= 0)
+		return 0;
+
+	parts_off = fdt_add_subnode(blob, spi_off, "partitions");
+	if (parts_off < 0) {
+		printf("Can't add partitions node: %s\n", fdt_strerror(parts_off));
+		return 0;
+	}
+
+	ret = fdt_setprop_string(blob, parts_off, "compatible", "fixed-partitions");
+	if (ret < 0) {
+		printf("Can't set compatible property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	ret = fdt_setprop_u32(blob, parts_off, "#address-cells", 1);
+	if (ret < 0) {
+		printf("Can't set #address-cells property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	ret = fdt_setprop_u32(blob, parts_off, "#size-cells", 1);
+	if (ret < 0) {
+		printf("Can't set #size-cells property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	/* Add u-boot-env partition */
+
+	part_off = fdt_add_subnode(blob, parts_off, "partition@u-boot-env");
+	if (part_off < 0) {
+		printf("Can't add partition@u-boot-env node: %s\n", fdt_strerror(part_off));
+		return 0;
+	}
+
+	ret = fdt_setprop_u32(blob, part_off, "reg", CONFIG_ENV_OFFSET);
+	if (ret < 0) {
+		printf("Can't set partition@u-boot-env reg property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	ret = fdt_appendprop_u32(blob, part_off, "reg", CONFIG_ENV_SIZE);
+	if (ret < 0) {
+		printf("Can't set partition@u-boot-env reg property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	ret = fdt_setprop_string(blob, part_off, "label", "u-boot-env");
+	if (ret < 0) {
+		printf("Can't set partition@u-boot-env label property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	/* Add firmware partition */
+
+	part_off = fdt_add_subnode(blob, parts_off, "partition@firmware");
+	if (part_off < 0) {
+		printf("Can't add partition@firmware node: %s\n", fdt_strerror(part_off));
+		return 0;
+	}
+
+	ret = fdt_setprop_u32(blob, part_off, "reg", 0);
+	if (ret < 0) {
+		printf("Can't set partition@firmware reg property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	ret = fdt_appendprop_u32(blob, part_off, "reg", CONFIG_ENV_OFFSET);
+	if (ret < 0) {
+		printf("Can't set partition@firmware reg property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	ret = fdt_setprop_string(blob, part_off, "label", "firmware");
+	if (ret < 0) {
+		printf("Can't set partition@firmware label property: %s\n", fdt_strerror(ret));
+		return 0;
+	}
+
+	return 0;
+}
+#endif

configs/mvebu_espressobin-88f3720_defconfig

@@ -82,3 +82,4 @@ CONFIG_SHA1=y
 CONFIG_SHA256=y
 CONFIG_MVNETA=y
 CONFIG_DM_REGULATOR_GPIO=y
+CONFIG_OF_BOARD_SETUP=y