pinctrl: spawn U300 pinctrl from the COH901 GPIO

This solves the riddle on how the U300 pin controller shall be
able to reference the struct gpio_chip even though these are
two separate drivers: spawn the pinctrl child from the GPIO
driver and pass in the struct gpio_chip as platform data.
In the process we rename the U300 "pinmux-u300" to
"pinctrl-u300" so as not to confuse.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

4 files changed, 38 insertions, 24 deletions

diff --git a/arch/arm/mach-u300/core.c b/arch/arm/mach-u300/core.c
index bb1034f8c2f5..030b2c0d322d 100644
--- a/arch/arm/mach-u300/core.c
+++ b/arch/arm/mach-u300/core.c
@@ -1477,7 +1477,7 @@ static struct coh901318_platform coh901318_platform = {
         .max_channels = U300_DMA_CHANNELS,
 };
 
-static struct resource pinmux_resources[] = {
+static struct resource pinctrl_resources[] = {
         {
                 .start = U300_SYSCON_BASE,
                 .end   = U300_SYSCON_BASE + SZ_4K - 1,
@@ -1506,6 +1506,13 @@ static struct platform_device i2c1_device = {
         .resource = i2c1_resources,
 };
 
+static struct platform_device pinctrl_device = {
+        .name = "pinctrl-u300",
+        .id = -1,
+        .num_resources = ARRAY_SIZE(pinctrl_resources),
+        .resource = pinctrl_resources,
+};
+
 /*
  * The different variants have a few different versions of the
  * GPIO block, with different number of ports.
@@ -1525,6 +1532,7 @@ static struct u300_gpio_platform u300_gpio_plat = {
 #endif
         .gpio_base = 0,
         .gpio_irq_base = IRQ_U300_GPIO_BASE,
+        .pinctrl_device = &pinctrl_device,
 };
 
 static struct platform_device gpio_device = {
@@ -1597,23 +1605,16 @@ static struct platform_device dma_device = {
         },
 };
 
-static struct platform_device pinmux_device = {
-        .name = "pinmux-u300",
-        .id = -1,
-        .num_resources = ARRAY_SIZE(pinmux_resources),
-        .resource = pinmux_resources,
-};
-
 /* Pinmux settings */
 static struct pinctrl_map __initdata u300_pinmux_map[] = {
         /* anonymous maps for chip power and EMIFs */
-        PIN_MAP_SYS_HOG("POWER", "pinmux-u300", "power"),
-        PIN_MAP_SYS_HOG("EMIF0", "pinmux-u300", "emif0"),
-        PIN_MAP_SYS_HOG("EMIF1", "pinmux-u300", "emif1"),
+        PIN_MAP_SYS_HOG("POWER", "pinctrl-u300", "power"),
+        PIN_MAP_SYS_HOG("EMIF0", "pinctrl-u300", "emif0"),
+        PIN_MAP_SYS_HOG("EMIF1", "pinctrl-u300", "emif1"),
         /* per-device maps for MMC/SD, SPI and UART */
-        PIN_MAP("MMCSD", "pinmux-u300", "mmc0", "mmci"),
-        PIN_MAP("SPI", "pinmux-u300", "spi0", "pl022"),
-        PIN_MAP("UART0", "pinmux-u300", "uart0", "uart0"),
+        PIN_MAP("MMCSD", "pinctrl-u300", "mmc0", "mmci"),
+        PIN_MAP("SPI", "pinctrl-u300", "spi0", "pl022"),
+        PIN_MAP("UART0", "pinctrl-u300", "uart0", "uart0"),
 };
 
 struct u300_mux_hog {
@@ -1676,7 +1677,6 @@ static struct platform_device *platform_devs[] __initdata = {
         &gpio_device,
         &nand_device,
         &wdog_device,
-        &pinmux_device,
 };
 
 /*
diff --git a/arch/arm/mach-u300/include/mach/gpio-u300.h b/arch/arm/mach-u300/include/mach/gpio-u300.h
index bf4c7935aecd..e81400c1753a 100644
--- a/arch/arm/mach-u300/include/mach/gpio-u300.h
+++ b/arch/arm/mach-u300/include/mach/gpio-u300.h
@@ -24,12 +24,14 @@ enum u300_gpio_variant {
  * @ports: number of GPIO block ports
  * @gpio_base: first GPIO number for this block (use a free range)
  * @gpio_irq_base: first GPIO IRQ number for this block (use a free range)
+ * @pinctrl_device: pin control device to spawn as child
  */
 struct u300_gpio_platform {
         enum u300_gpio_variant variant;
         u8 ports;
         int gpio_base;
         int gpio_irq_base;
+        struct platform_device *pinctrl_device;
 };
 
 #endif /* __MACH_U300_GPIO_U300_H */
diff --git a/drivers/pinctrl/pinctrl-coh901.c b/drivers/pinctrl/pinctrl-coh901.c
index eba232a46a82..b90c01144fea 100644
--- a/drivers/pinctrl/pinctrl-coh901.c
+++ b/drivers/pinctrl/pinctrl-coh901.c
@@ -705,7 +705,6 @@ static inline void u300_gpio_free_ports(struct u300_gpio *gpio)
         list_for_each_safe(p, n, &gpio->port_list) {
                 port = list_entry(p, struct u300_gpio_port, node);
                 list_del(&port->node);
-                free_irq(port->irq, port);
                 kfree(port);
         }
 }
@@ -861,10 +860,18 @@ static int __init u300_gpio_probe(struct platform_device *pdev)
                 goto err_no_chip;
         }
 
+        /* Spawn pin controller device as child of the GPIO, pass gpio chip */
+        plat->pinctrl_device->dev.platform_data = &gpio->chip;
+        err = platform_device_register(plat->pinctrl_device);
+        if (err)
+                goto err_no_pinctrl;
+
         platform_set_drvdata(pdev, gpio);
 
         return 0;
 
+err_no_pinctrl:
+        err = gpiochip_remove(&gpio->chip);
 err_no_chip:
 err_no_port:
         u300_gpio_free_ports(gpio);
@@ -919,7 +926,6 @@ static struct platform_driver u300_gpio_driver = {
         .remove         = __exit_p(u300_gpio_remove),
 };
 
-
 static int __init u300_gpio_init(void)
 {
         return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
diff --git a/drivers/pinctrl/pinctrl-u300.c b/drivers/pinctrl/pinctrl-u300.c
index c8d02f1c2b5e..fc4a281caba5 100644
--- a/drivers/pinctrl/pinctrl-u300.c
+++ b/drivers/pinctrl/pinctrl-u300.c
@@ -162,7 +162,7 @@
 #define U300_SYSCON_PMC4R_APP_MISC_16_APP_UART1_CTS             0x0100
 #define U300_SYSCON_PMC4R_APP_MISC_16_EMIF_1_STATIC_CS5_N       0x0200
 
-#define DRIVER_NAME "pinmux-u300"
+#define DRIVER_NAME "pinctrl-u300"
 
 /*
  * The DB3350 has 467 pads, I have enumerated the pads clockwise around the
@@ -1053,13 +1053,16 @@ static struct pinctrl_desc u300_pmx_desc = {
         .owner = THIS_MODULE,
 };
 
-static int __init u300_pmx_probe(struct platform_device *pdev)
+static int __devinit u300_pmx_probe(struct platform_device *pdev)
 {
         struct u300_pmx *upmx;
         struct resource *res;
+        struct gpio_chip *gpio_chip = dev_get_platdata(&pdev->dev);
         int ret;
         int i;
 
+        pr_err("U300 PMX PROBE\n");
+
         /* Create state holders etc for this driver */
         upmx = devm_kzalloc(&pdev->dev, sizeof(*upmx), GFP_KERNEL);
         if (!upmx)
@@ -1095,12 +1098,14 @@ static int __init u300_pmx_probe(struct platform_device *pdev)
         }
 
         /* We will handle a range of GPIO pins */
-        for (i = 0; i < ARRAY_SIZE(u300_gpio_ranges); i++)
+        for (i = 0; i < ARRAY_SIZE(u300_gpio_ranges); i++) {
+                u300_gpio_ranges[i].gc = gpio_chip;
                 pinctrl_add_gpio_range(upmx->pctl, &u300_gpio_ranges[i]);
+        }
 
         platform_set_drvdata(pdev, upmx);
 
-        dev_info(&pdev->dev, "initialized U300 pinmux driver\n");
+        dev_info(&pdev->dev, "initialized U300 pin control driver\n");
 
         return 0;
 
@@ -1115,7 +1120,7 @@ out_no_resource:
         return ret;
 }
 
-static int __exit u300_pmx_remove(struct platform_device *pdev)
+static int __devexit u300_pmx_remove(struct platform_device *pdev)
 {
         struct u300_pmx *upmx = platform_get_drvdata(pdev);
         int i;
@@ -1136,12 +1141,13 @@ static struct platform_driver u300_pmx_driver = {
                 .name = DRIVER_NAME,
                 .owner = THIS_MODULE,
         },
-        .remove = __exit_p(u300_pmx_remove),
+        .probe = u300_pmx_probe,
+        .remove = __devexit_p(u300_pmx_remove),
 };
 
 static int __init u300_pmx_init(void)
 {
-        return platform_driver_probe(&u300_pmx_driver, u300_pmx_probe);
+        return platform_driver_register(&u300_pmx_driver);
 }
 arch_initcall(u300_pmx_init);