[PATCH v5 2/4] pinctrl: mediatek: allow common drivers to be built as modules

[Justin Yeh <justin.yeh@mediatek.com>]

The MediaTek SoC pinctrl drivers link against the shared implementations
in pinctrl-mtk-common.c (v1), pinctrl-moore.c and pinctrl-mtmips.c. These
were built-in only: their Kconfig symbols were bool, they did not export
their entry points and they carried no MODULE_LICENSE().

To let the individual SoC drivers be built as loadable modules (required
for Android GKI + vendor_dlkm, where vendor drivers must live outside the
GKI vmlinux), the shared code they depend on has to be modular too.
Otherwise selecting a SoC driver as =m forces the common symbol to =y and
the resulting module fails to link against the unexported common entry
points.

Convert PINCTRL_MTK, PINCTRL_MTK_MOORE and PINCTRL_MTK_MTMIPS to
tristate, export the entry points used by the SoC drivers, and add
MODULE_DESCRIPTION()/MODULE_LICENSE() to the three common files.

The v2 common code (PINCTRL_MTK_V2) is already modular, but mtk_rmw() was
never exported. It is called directly by SoC drivers such as mt7623, so
export it as well to keep those drivers linking once they are modular.

Signed-off-by: Justin Yeh <justin.yeh@mediatek.com>
---
 drivers/pinctrl/mediatek/Kconfig                 | 6 +++---
 drivers/pinctrl/mediatek/pinctrl-moore.c         | 5 +++++
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 1 +
 drivers/pinctrl/mediatek/pinctrl-mtk-common.c    | 8 ++++++++
 drivers/pinctrl/mediatek/pinctrl-mtmips.c        | 4 ++++
 5 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/mediatek/Kconfig b/drivers/pinctrl/mediatek/Kconfig
index 97980cc28b9c..864e7ffc6044 100644
--- a/drivers/pinctrl/mediatek/Kconfig
+++ b/drivers/pinctrl/mediatek/Kconfig
@@ -11,7 +11,7 @@ config EINT_MTK
 	default PINCTRL_MTK_PARIS
 
 config PINCTRL_MTK
-	bool
+	tristate
 	depends on OF
 	select PINMUX
 	select GENERIC_PINCONF
@@ -22,13 +22,13 @@ config PINCTRL_MTK_V2
 	tristate
 
 config PINCTRL_MTK_MTMIPS
-	bool
+	tristate
 	depends on RALINK
 	select PINMUX
 	select GENERIC_PINCONF
 
 config PINCTRL_MTK_MOORE
-	bool
+	tristate
 	depends on OF
 	select GENERIC_PINCONF
 	select GENERIC_PINCTRL_GROUPS
diff --git a/drivers/pinctrl/mediatek/pinctrl-moore.c b/drivers/pinctrl/mediatek/pinctrl-moore.c
index 38f15dbe9a28..3247622911cd 100644
--- a/drivers/pinctrl/mediatek/pinctrl-moore.c
+++ b/drivers/pinctrl/mediatek/pinctrl-moore.c
@@ -10,6 +10,7 @@
 
 #include <dt-bindings/pinctrl/mt65xx.h>
 #include <linux/gpio/driver.h>
+#include <linux/module.h>
 
 #include <linux/pinctrl/consumer.h>
 
@@ -743,3 +744,7 @@ int mtk_moore_pinctrl_probe(struct platform_device *pdev,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(mtk_moore_pinctrl_probe);
+
+MODULE_DESCRIPTION("MediaTek Pinctrl Common Driver V2 Moore");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 4918d38abfc2..3813dfb0fa7d 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -69,6 +69,7 @@ void mtk_rmw(struct mtk_pinctrl *pctl, u8 i, u32 reg, u32 mask, u32 set)
 
 	spin_unlock_irqrestore(&pctl->lock, flags);
 }
+EXPORT_SYMBOL_GPL(mtk_rmw);
 
 static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw,
 				   const struct mtk_pin_desc *desc,
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
index 791eddd7a2c6..a58015b508af 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c
@@ -7,6 +7,7 @@
 
 #include <linux/io.h>
 #include <linux/gpio/driver.h>
+#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/pinctrl/consumer.h>
@@ -190,6 +191,7 @@ int mtk_pconf_spec_set_ies_smt_range(struct regmap *regmap,
 	regmap_write(regmap, reg_addr, bit);
 	return 0;
 }
+EXPORT_SYMBOL_GPL(mtk_pconf_spec_set_ies_smt_range);
 
 static const struct mtk_pin_drv_grp *mtk_find_pin_drv_grp_by_pin(
 		struct mtk_pinctrl *pctl,  unsigned long pin) {
@@ -297,6 +299,7 @@ int mtk_pctrl_spec_pull_set_samereg(struct regmap *regmap,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(mtk_pctrl_spec_pull_set_samereg);
 
 static int mtk_pconf_set_pull_select(struct mtk_pinctrl *pctl,
 		unsigned int pin, bool enable, bool isup, unsigned int arg)
@@ -1149,6 +1152,7 @@ int mtk_pctrl_init(struct platform_device *pdev,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(mtk_pctrl_init);
 
 int mtk_pctrl_common_probe(struct platform_device *pdev)
 {
@@ -1160,3 +1164,7 @@ int mtk_pctrl_common_probe(struct platform_device *pdev)
 
 	return mtk_pctrl_init(pdev, data, NULL);
 }
+EXPORT_SYMBOL_GPL(mtk_pctrl_common_probe);
+
+MODULE_DESCRIPTION("MediaTek Pinctrl Common Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtmips.c b/drivers/pinctrl/mediatek/pinctrl-mtmips.c
index efd77b6c56a1..c9d9de68e282 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtmips.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtmips.c
@@ -349,3 +349,7 @@ int mtmips_pinctrl_init(struct platform_device *pdev,
 
 	return PTR_ERR_OR_ZERO(dev);
 }
+EXPORT_SYMBOL_GPL(mtmips_pinctrl_init);
+
+MODULE_DESCRIPTION("MediaTek MIPS Pinctrl Common Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.45.2