[PATCH 2/2] pmdomain: imx: scu-pd: allow building as a module

[Zhipeng.wang_1 at oss.nxp.com]

From: Zhipeng Wang <zhipeng.wang_1 at nxp.com>

Convert CONFIG_IMX_SCU_PD from bool to tristate to allow building as a
loadable module. This is needed on Android devices using the Generic
Kernel Image (GKI), where SoC-specific drivers must be built as modules
rather than built into the core kernel image.

For i.MX8Q devices running Android with a GKI kernel, the SCU power
domain driver must be loadable. Without tristate support, power domains
cannot be properly initialized, preventing these systems from
functioning under GKI.

Add MODULE_DEVICE_TABLE() for OF-based module autoloading. When built
as a module, use module_platform_driver(); when built-in, retain
builtin_platform_driver() to preserve the existing initialization
ordering.

Signed-off-by: Zhipeng Wang <zhipeng.wang_1 at nxp.com>
---
 drivers/pmdomain/imx/Kconfig  | 2 +-
 drivers/pmdomain/imx/scu-pd.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pmdomain/imx/Kconfig b/drivers/pmdomain/imx/Kconfig
index 00203615c65e..472e9dec6bd4 100644
--- a/drivers/pmdomain/imx/Kconfig
+++ b/drivers/pmdomain/imx/Kconfig
@@ -21,7 +21,7 @@ config IMX9_BLK_CTRL
 	depends on PM_GENERIC_DOMAINS
 
 config IMX_SCU_PD
-	bool "IMX SCU Power Domain driver"
+	tristate "IMX SCU Power Domain driver"
 	depends on IMX_SCU
 	help
 	  The System Controller Firmware (SCFW) based power domain driver.
diff --git a/drivers/pmdomain/imx/scu-pd.c b/drivers/pmdomain/imx/scu-pd.c
index 3ec33667a308..21c7e2505087 100644
--- a/drivers/pmdomain/imx/scu-pd.c
+++ b/drivers/pmdomain/imx/scu-pd.c
@@ -531,6 +531,7 @@ static const struct of_device_id imx_sc_pd_match[] = {
 	{ .compatible = "fsl,scu-pd", &imx8qxp_scu_pd},
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, imx_sc_pd_match);
 
 static struct platform_driver imx_sc_pd_driver = {
 	.driver = {
@@ -540,7 +541,12 @@ static struct platform_driver imx_sc_pd_driver = {
 	},
 	.probe = imx_sc_pd_probe,
 };
+
+#ifdef MODULE
+module_platform_driver(imx_sc_pd_driver);
+#else
 builtin_platform_driver(imx_sc_pd_driver);
+#endif
 
 MODULE_AUTHOR("Dong Aisheng <aisheng.dong at nxp.com>");
 MODULE_DESCRIPTION("IMX SCU Power Domain driver");
-- 
2.34.1