mach-snapdragon: pass fdt to qcom_parse_memory

commit fc37a73e6679 ("fdt: Swap the signature for
board_fdt_blob_setup()") introduced a subtle change to the Snapdragon
implementation, removing the assignment to gd->fdt_blob partway through
the function.

This breaks qcom_parse_memory() which was also called during
board_fdt_blob_setup().

The underlying issue here is that qcom_parse_memory is using the of_ api
to traverse a devicetree, which relies on the fdt_blob in global data.

Rather than relying on this subtle behaviour, explicitly pass the FDT
that should be consulted for a /memory node.

Using the OF API is typically preferable because it's easier to read,
but using the lower level fdt_ methods instead here doesn't add too much
complexity, I think.

Finally, a minor tweak was made to board_fdt_blob_setup to use the
passed fdt blob pointer instead of gd->fdt_blob, which removes the last
of the references to global data in this area.

Fixes: fc37a73e6679 (fdt: Swap the signature for board_fdt_blob_setup())
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Sam Day <me@samcday.com>
Link: https://lore.kernel.org/r/20250122-qcom-parse-memory-updates-v2-1-98dfcac821d7@samcday.com
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

diff --git a/arch/arm/mach-snapdragon/board.c b/arch/arm/mach-snapdragon/board.c
index f1319df..2ef936a 100644 (file)
--- a/arch/arm/mach-snapdragon/board.c
+++ b/arch/arm/mach-snapdragon/board.c
@@ -88,20 +88,21 @@ int dram_init_banksize(void)
        return 0;
 }
 
-static void qcom_parse_memory(void)
+static void qcom_parse_memory(const void *fdt)
 {
-       ofnode node;
+       int offset;
        const fdt64_t *memory;
        int memsize;
        phys_addr_t ram_end = 0;
        int i, j, banks;
 
-       node = ofnode_path("/memory");
-       if (!ofnode_valid(node)) {
+       offset = fdt_path_offset(fdt, "/memory");
+       if (offset < 0) {
                log_err("No memory node found in device tree!\n");
                return;
        }
-       memory = ofnode_read_prop(node, "reg", &memsize);
+
+       memory = fdt_getprop(fdt, offset, "reg", &memsize);
        if (!memory) {
                log_err("No memory configuration was provided by the previous bootloader!\n");
                return;
@@ -158,7 +159,7 @@ int board_fdt_blob_setup(void **fdtp)
 
        fdt = (struct fdt_header *)get_prev_bl_fdt_addr();
        external_valid = fdt && !fdt_check_header(fdt);
-       internal_valid = !fdt_check_header(gd->fdt_blob);
+       internal_valid = !fdt_check_header(*fdtp);
 
        /*
         * There is no point returning an error here, U-Boot can't do anything useful in this situation.
@@ -181,7 +182,7 @@ int board_fdt_blob_setup(void **fdtp)
         * Parse the /memory node while we're here,
         * this makes it easy to do other things early.
         */
-       qcom_parse_memory();
+       qcom_parse_memory(*fdtp);
 
        return ret;
 }