[PATCH] spl: fit: List DTOs applied by SPL in U-Boot control DT

[Marek Vasut]

Insert /u-boot,<dto-name> = <index> property into the U-Boot control DT
during SPL DTO application process. This can be used by user to inspect
which DTOs got applied by the SPL and in which order from running U-Boot.

Example:
```
u-boot=> fdt addr $fdtcontroladdr && fdt list /
Working FDT set to aee9aeb0
/ {
        u-boot,fdt-dto-imx8mp-dhcom-pdk3-overlay-rev100 = <0x00000005>;
        u-boot,fdt-dto-imx8mp-dhcom-som-overlay-rev100 = <0x00000004>;
        u-boot,fdt-dto-imx8mp-dhcom-pdk-overlay-eth2xfast = <0x00000003>;
        u-boot,fdt-dto-imx8mp-dhcom-som-overlay-eth2xfast = <0x00000002>;
...
```

Signed-off-by: Marek Vasut <marex at denx.de>
---
Cc: Manoj Sai <abbaraju.manojsai at amarulasolutions.com>
Cc: Sean Anderson <seanga2 at gmail.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Suniel Mahesh <sunil at amarulasolutions.com>
Cc: Tom Rini <trini at konsulko.com>
Cc: u-boot at dh-electronics.com
Cc: u-boot at lists.denx.de
---
 common/spl/spl_fit.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c
index 988125be008..261b72419b1 100644
--- a/common/spl/spl_fit.c
+++ b/common/spl/spl_fit.c
@@ -363,6 +363,7 @@ static int spl_fit_append_fdt(struct spl_image_info *spl_image,
 {
 	struct spl_image_info image_info;
 	int node, ret = 0, index = 0;
+	char dtoname[256];
 
 	/*
 	 * Use the address following the image as target address for the
@@ -450,7 +451,7 @@ static int spl_fit_append_fdt(struct spl_image_info *spl_image,
 
 			/* Make room in FDT for changes from the overlay */
 			ret = fdt_increase_size(spl_image->fdt_addr,
-						image_info.size);
+						image_info.size + strlen(str));
 			if (ret < 0)
 				break;
 
@@ -464,6 +465,26 @@ static int spl_fit_append_fdt(struct spl_image_info *spl_image,
 
 			debug("%s: DT overlay %s applied\n", __func__,
 			      fit_get_name(ctx->fit, node, NULL));
+
+			/*
+			 * Insert /u-boot,<dto-name> = <index> property into
+			 * the U-Boot control DT. This can be used by user
+			 * to inspect which DTOs got applied by the SPL from
+			 * a running U-Boot.
+			 */
+			snprintf(dtoname, sizeof(dtoname), "u-boot,%s", str);
+			ret = fdt_setprop_u32(spl_image->fdt_addr, 0, dtoname,
+					      index);
+			if (!ret) {
+				/*
+				 * The DTO itself was applied, do not treat the
+				 * insertion of /u-boot,<dto-name> as an error
+				 * so the system can possibly boot somehow.
+				 */
+				debug("%s: DT overlay %s name not inserted into / node (%d)\n",
+				      __func__,
+				      fit_get_name(ctx->fit, node, NULL), ret);
+			}
 		}
 		free(tmpbuffer);
 		if (ret)
-- 
2.43.0