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[fdt] Provide fdt_reg() for unsized single-entry regions

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Many region types (e.g. I2C bus addresses) can only ever contain a
single region with no size cells specified.  Provide fdt_reg() to
reduce boilerplate in this common use case.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-08-07 15:41:42 +01:00
parent 9d4a2ee353
commit 88ba011764
3 changed files with 55 additions and 7 deletions
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src/drivers/bus/devtree.c
+3 -7
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@@ -52,22 +52,18 @@ static struct dt_driver dt_node_driver __dt_driver;
void * dt_ioremap ( struct dt_device *dt, unsigned int offset,
unsigned int index, size_t len ) {
struct fdt_reg_cells regs;
unsigned int parent;
uint64_t address;
uint64_t size;
void *io_addr;
int rc;
/* Get parent node */
if ( ( rc = fdt_parent ( &sysfdt, offset, &parent ) ) != 0 ) {
DBGC ( dt, "DT %s could not locate parent: %s\n",
/* Get parent region cell size specification */
if ( ( rc = fdt_parent_reg_cells ( &sysfdt, offset, &regs ) ) != 0 ) {
DBGC ( dt, "DT %s could not get region cell sizes: %s\n",
dt->name, strerror ( rc ) );
return NULL;
}
/* Read #address-cells and #size-cells, if present */
fdt_reg_cells ( &sysfdt, parent, &regs );
/* Read address */
if ( ( rc = fdt_reg_address ( &sysfdt, offset, &regs, index,
&address ) ) != 0 ) {