linux-kernel - [PATCH V2 1/4] gpio: mxc: Support module build

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Date:   Wed, 22 Jul 2020 09:45:50 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     linux@...linux.org.uk, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, catalin.marinas@....com,
        will@...nel.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, peter.chen@....com,
        oleksandr.suvorov@...adex.com, andreas@...nade.info,
        peng.fan@....com, hverkuil-cisco@...all.nl, olof@...om.net,
        krzk@...nel.org, alexandre.torgue@...com, patrice.chotard@...com,
        arnd@...db.de, m.szyprowski@...sung.com, joel@....id.au,
        lkundrak@...sk, christian.gmeiner@...il.com,
        bjorn.andersson@...aro.org, leoyang.li@....com,
        geert+renesas@...der.be, michael@...le.cc,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH V2 1/4] gpio: mxc: Support module build

Change config to tristate, add module device table, module author,
description and license to support module build for i.MX GPIO driver.

As this is a SoC GPIO module, it provides common functions for most
of the peripheral devices, such as GPIO pins control, secondary
interrupt controller for GPIO pins IRQ etc., without GPIO driver, most
of the peripheral devices will NOT work properly, so GPIO module is
similar with clock, pinctrl driver that should be loaded ONCE and
never unloaded.

Since MXC GPIO driver needs to have init function to register syscore
ops once, here still use subsys_initcall(), NOT module_platform_driver().

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
Changes since V1:
	- no code change, just add detail explanation about why this patch
	  does NOT support module unloaded.
---
 drivers/gpio/Kconfig    | 2 +-
 drivers/gpio/gpio-mxc.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8030fd9..468916b 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -397,7 +397,7 @@ config GPIO_MVEBU
 	select REGMAP_MMIO
 
 config GPIO_MXC
-	def_bool y
+	tristate "i.MX GPIO support"
 	depends on ARCH_MXC || COMPILE_TEST
 	select GPIO_GENERIC
 	select GENERIC_IRQ_CHIP
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 64278a4..643f4c55 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -15,6 +15,7 @@
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
 #include <linux/irqchip/chained_irq.h>
+#include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/syscore_ops.h>
@@ -158,6 +159,7 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
 	{ .compatible = "fsl,imx7d-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], },
 	{ /* sentinel */ }
 };
+MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids);
 
 /*
  * MX2 has one interrupt *for all* gpio ports. The list is used
@@ -604,3 +606,7 @@ static int __init gpio_mxc_init(void)
 	return platform_driver_register(&mxc_gpio_driver);
 }
 subsys_initcall(gpio_mxc_init);
+
+MODULE_AUTHOR("Shawn Guo <shawn.guo@...aro.org>");
+MODULE_DESCRIPTION("i.MX GPIO Driver");
+MODULE_LICENSE("GPL");
-- 
2.7.4