From: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
Date: Fri, 28 Nov 2025 14:31:06 +0000 (+0100)
Subject: power: domain: Add ti-omap-prm stub
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86d2747a9c92dacccf0bedd57d586252e2c9532d;p=thirdparty%2Fu-boot.git

power: domain: Add ti-omap-prm stub

Upstream DT uses simple-pm-bus instead of simple-bus. simple-pm-bus
requires power domain support. On am33xx, PRM manages power domains but
all domains are enabled at boot. Add stub driver with custom of_xlate
that expects no argumetns to allow simple-pm-bus and dependent devices
to probe.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>
---

diff --git a/drivers/power/domain/Kconfig b/drivers/power/domain/Kconfig
index 0ad885c9e8b..935f282d6c5 100644
--- a/drivers/power/domain/Kconfig
+++ b/drivers/power/domain/Kconfig
@@ -125,6 +125,14 @@ config TI_POWER_DOMAIN
 	help
 	  Generic power domain implementation for TI K3 devices.
 
+config TI_OMAP_PRM_POWER_DOMAIN
+	bool "Enable the TI OMAP PRM power domain driver"
+	depends on POWER_DOMAIN && ARCH_OMAP2PLUS
+	help
+	  Enable support for TI OMAP Power and Reset Manager (PRM) power domains.
+	  The driver is currently a stub to be able to probe devices that
+	  require this type of power domain device.
+
 config ZYNQMP_POWER_DOMAIN
 	bool "Enable the Xilinx ZynqMP Power domain driver"
 	depends on POWER_DOMAIN && ZYNQMP_FIRMWARE
diff --git a/drivers/power/domain/Makefile b/drivers/power/domain/Makefile
index 8e03f620437..b2c0bd8a61a 100644
--- a/drivers/power/domain/Makefile
+++ b/drivers/power/domain/Makefile
@@ -21,4 +21,5 @@ obj-$(CONFIG_SCMI_POWER_DOMAIN) += scmi-power-domain.o
 obj-$(CONFIG_TEGRA186_POWER_DOMAIN) += tegra186-power-domain.o
 obj-$(CONFIG_TI_SCI_POWER_DOMAIN) += ti-sci-power-domain.o
 obj-$(CONFIG_TI_POWER_DOMAIN) += ti-power-domain.o
+obj-$(CONFIG_TI_OMAP_PRM_POWER_DOMAIN) += ti-omap-prm.o
 obj-$(CONFIG_ZYNQMP_POWER_DOMAIN) += zynqmp-power-domain.o
diff --git a/drivers/power/domain/ti-omap-prm.c b/drivers/power/domain/ti-omap-prm.c
new file mode 100644
index 00000000000..c240e2682ea
--- /dev/null
+++ b/drivers/power/domain/ti-omap-prm.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * TI OMAP PRM (Power and Reset Manager) power domain driver
+ *
+ * Stub driver to provide power domain support.
+ */
+
+#include <dm.h>
+#include <power-domain-uclass.h>
+
+static int ti_omap_prm_xlate(struct power_domain *power_domain,
+			     struct ofnode_phandle_args *args)
+{
+	if (args->args_count != 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static const struct udevice_id ti_omap_prm_ids[] = {
+	{ .compatible = "ti,am3-prm-inst" },
+	{ .compatible = "ti,am4-prm-inst" },
+	{ .compatible = "ti,omap-prm-inst" },
+	{ }
+};
+
+static struct power_domain_ops ti_omap_prm_ops = {
+	.of_xlate = ti_omap_prm_xlate,
+};
+
+U_BOOT_DRIVER(ti_omap_prm) = {
+	.name = "ti-omap-prm",
+	.id = UCLASS_POWER_DOMAIN,
+	.of_match = ti_omap_prm_ids,
+	.ops = &ti_omap_prm_ops,
+};