[PATCH] of: property: special #nvmem-cell-cells handling

[Michael Walle <michael@walle.cc>]

Since recently, there is a new #nvmem-cell-cells. To be backwards
compatible this is optional. Therefore, we need special handling and
cannot use DEFINE_SIMPLE_PROP() anymore.

Signed-off-by: Michael Walle <michael@walle.cc>
---
This patch will be part of the following series:
https://lore.kernel.org/linux-arm-kernel/20221118185118.1190044-1-michael@walle.cc/

 drivers/of/property.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/of/property.c b/drivers/of/property.c
index 967f79b59016..93c0ea662336 100644
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -1305,7 +1305,6 @@ DEFINE_SIMPLE_PROP(dmas, "dmas", "#dma-cells")
 DEFINE_SIMPLE_PROP(power_domains, "power-domains", "#power-domain-cells")
 DEFINE_SIMPLE_PROP(hwlocks, "hwlocks", "#hwlock-cells")
 DEFINE_SIMPLE_PROP(extcon, "extcon", NULL)
-DEFINE_SIMPLE_PROP(nvmem_cells, "nvmem-cells", NULL)
 DEFINE_SIMPLE_PROP(phys, "phys", "#phy-cells")
 DEFINE_SIMPLE_PROP(wakeup_parent, "wakeup-parent", NULL)
 DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0", NULL)
@@ -1381,6 +1380,22 @@ static struct device_node *parse_interrupts(struct device_node *np,
 	return of_irq_parse_one(np, index, &sup_args) ? NULL : sup_args.np;
 }
 
+static struct device_node *parse_nvmem_cells(struct device_node *np,
+					     const char *prop_name, int index)
+{
+	struct of_phandle_args sup_args;
+
+	if (strcmp(prop_name, "nvmem-cells"))
+		return NULL;
+
+	if (of_parse_phandle_with_optional_args(np, prop_name,
+						"#nvmem-cell-cells", index,
+						&sup_args))
+		return NULL;
+
+	return sup_args.np;
+}
+
 static const struct supplier_bindings of_supplier_bindings[] = {
 	{ .parse_prop = parse_clocks, },
 	{ .parse_prop = parse_interconnects, },
-- 
2.30.2