mmc: pxamci: Support getting GPIO descs for RO and WP

This implements the code path for the PXAMCI hostso that
it can retrieve GPIO descriptors rather than use the
global GPIO numberspace for GPIO lines. If the GPIO
descriptor is present, it will take precedence and get
used in place of the platform data GPIO number.

We move the code around a bit so we request the card
detect first and the write protect second.

We keep the code setting the host flag for the write
protect polarity inversion semantics since the slot
GPIO core needs to be refactored to deal with this
before we can get rid of this.

Cc: Daniel Mack <daniel@zonque.org>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/pxamci.c

@@ -33,7 +33,6 @@
 #include <linux/gpio.h>
 #include <linux/gfp.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/of_device.h>
 
 #include <asm/sizes.h>
@@ -63,6 +62,7 @@ struct pxamci_host {
 	unsigned int		imask;
 	unsigned int		power_mode;
 	unsigned long		detect_delay_ms;
+	bool			use_ro_gpio;
 	struct pxamci_platform_data *pdata;
 
 	struct mmc_request	*mrq;
@@ -432,7 +432,7 @@ static int pxamci_get_ro(struct mmc_host *mmc)
 {
 	struct pxamci_host *host = mmc_priv(mmc);
 
-	if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro))
+	if (host->use_ro_gpio)
 		return mmc_gpio_get_ro(mmc);
 	if (host->pdata && host->pdata->get_ro)
 		return !!host->pdata->get_ro(mmc_dev(mmc));
@@ -749,33 +749,47 @@ static int pxamci_probe(struct platform_device *pdev)
 					      host->pdata->gpio_power_invert);
 		}
 
-		if (gpio_is_valid(gpio_ro)) {
+		/* FIXME: should we pass detection delay to debounce? */
+		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+		if (ret && ret != -ENOENT) {
+			dev_err(dev, "Failed requesting gpio_cd\n");
+			goto out;
+		}
+		if (ret == -ENOENT && gpio_is_valid(gpio_cd)) {
+			ret = mmc_gpio_request_cd(mmc, gpio_cd, 0);
+			if (ret) {
+				dev_err(dev, "Failed requesting gpio_cd %d\n",
+					gpio_cd);
+			}
+		}
+
+		ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL);
+		if (ret && ret != -ENOENT) {
+			dev_err(dev, "Failed requesting gpio_ro\n");
+			goto out;
+		}
+		/* Try platform data instead */
+		if (ret == -ENOENT && gpio_is_valid(gpio_ro)) {
 			ret = mmc_gpio_request_ro(mmc, gpio_ro);
 			if (ret) {
 				dev_err(dev,
 					"Failed requesting gpio_ro %d\n",
 					gpio_ro);
 				goto out;
-			} else {
-				mmc->caps2 |= host->pdata->gpio_card_ro_invert ?
-					0 : MMC_CAP2_RO_ACTIVE_HIGH;
 			}
 		}
-
-		if (gpio_is_valid(gpio_cd))
-			ret = mmc_gpio_request_cd(mmc, gpio_cd, 0);
-		if (ret) {
-			dev_err(dev, "Failed requesting gpio_cd %d\n",
-				gpio_cd);
-			goto out;
+		if (!ret) {
+			host->use_ro_gpio = true;
+			mmc->caps2 |= host->pdata->gpio_card_ro_invert ?
+				0 : MMC_CAP2_RO_ACTIVE_HIGH;
 		}
 
 		if (host->pdata->init)
 			host->pdata->init(dev, pxamci_detect_irq, mmc);
 
 		if (gpio_is_valid(gpio_power) && host->pdata->setpower)
 			dev_warn(dev, "gpio_power and setpower() both defined\n");
-		if (gpio_is_valid(gpio_ro) && host->pdata->get_ro)
+		if (host->use_ro_gpio && host->pdata->get_ro)
 			dev_warn(dev, "gpio_ro and get_ro() both defined\n");
 	}