[PATCH v7 4/5] pinctrl: mediatek: mt7986: register both platform drivers from a single initcall

The MT7986 driver registers two separate platform drivers (mt7986a and
mt7986b) and used to call arch_initcall() twice, once for each.

This is fine while the driver is built-in, but a single translation unit
can only provide one module_init(). Since arch_initcall() expands to
module_init() when built as a module, having two of them would break the
module build with a redefinition of init_module()/__inittest().

Fold both platform drivers into a single driver array and register them
from one initcall using platform_register_drivers(), matching the shape of
the other MediaTek pinctrl SoC drivers. platform_register_drivers() also
rolls back the first registration if the second one fails.

No functional change for built-in builds; this is a preparatory cleanup
for enabling module builds.

Signed-off-by: Justin Yeh <redacted>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
---
 drivers/pinctrl/mediatek/pinctrl-mt7986.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mt7986.c b/drivers/pinctrl/mediatek/pinctrl-mt7986.c
index ca468115765b..d7c7591ed231 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mt7986.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7986.c

@@ -997,17 +997,16 @@ static struct platform_driver mt7986b_pinctrl_driver = {
 	.probe = mt7986b_pinctrl_probe,
 };
 
-static int __init mt7986a_pinctrl_init(void)
-{
-	return platform_driver_register(&mt7986a_pinctrl_driver);
-}
+static struct platform_driver * const mt7986_pinctrl_drivers[] = {
+	&mt7986a_pinctrl_driver,
+	&mt7986b_pinctrl_driver,
+};
 
-static int __init mt7986b_pinctrl_init(void)
+static int __init mt7986_pinctrl_init(void)
 {
-	return platform_driver_register(&mt7986b_pinctrl_driver);
+	return platform_register_drivers(mt7986_pinctrl_drivers,
+					 ARRAY_SIZE(mt7986_pinctrl_drivers));
 }
-
-arch_initcall(mt7986a_pinctrl_init);
-arch_initcall(mt7986b_pinctrl_init);
+arch_initcall(mt7986_pinctrl_init);
 
 MODULE_IMPORT_NS("MTK_PINCTRL");

-- 
2.45.2