pinctrl: at91-pio4: make it explicitly non-modular

The Kconfig currently controlling compilation of this code is:

drivers/pinctrl/Kconfig:config PINCTRL_AT91PIO4
drivers/pinctrl/Kconfig:        bool "AT91 PIO4 pinctrl driver"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.

We explicitly disallow a driver unbind, since that doesn't have a
sensible use case anyway, and it allows us to drop the ".remove"
code for non-modular drivers.

Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.

Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.

Cc: linux-gpio@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-at91-pio4.c

@@ -20,7 +20,7 @@
 #include <linux/gpio.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/module.h>
+#include <linux/init.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pinctrl/pinconf.h>
@@ -879,7 +879,6 @@ static const struct of_device_id atmel_pctrl_of_match[] = {
 		/* sentinel */
 	}
 };
-MODULE_DEVICE_TABLE(of, atmel_pctrl_of_match);
 
 static int atmel_pinctrl_probe(struct platform_device *pdev)
 {
@@ -1074,28 +1073,13 @@ clk_prepare_enable_error:
 	return ret;
 }
 
-static int atmel_pinctrl_remove(struct platform_device *pdev)
-{
-	struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
-
-	irq_domain_remove(atmel_pioctrl->irq_domain);
-	clk_disable_unprepare(atmel_pioctrl->clk);
-	gpiochip_remove(atmel_pioctrl->gpio_chip);
-
-	return 0;
-}
-
 static struct platform_driver atmel_pinctrl_driver = {
 	.driver = {
 		.name = "pinctrl-at91-pio4",
 		.of_match_table = atmel_pctrl_of_match,
 		.pm = &atmel_pctrl_pm_ops,
+		.suppress_bind_attrs = true,
 	},
 	.probe = atmel_pinctrl_probe,
-	.remove = atmel_pinctrl_remove,
 };
-module_platform_driver(atmel_pinctrl_driver);
-
-MODULE_AUTHOR(Ludovic Desroches <ludovic.desroches@atmel.com>);
-MODULE_DESCRIPTION("Atmel PIO4 pinctrl driver");
-MODULE_LICENSE("GPL v2");
+builtin_platform_driver(atmel_pinctrl_driver);