mmc: sdhci-pxav3: dt: Support "cd-gpios" property

Tested on OLPC XO-4/MMP3, where the card detection pin for one of
the controllers is a sideband GPIO.  The third cell in the cd-gpios
property controls whether the GPIO is active high/active low.

(Also, pass host_caps2 through from platdata to the mmc host.)
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
[kliu5@marvell.com: Compile fix]
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-pxav3.c

@@ -24,12 +24,14 @@
 #include <linux/gpio.h>
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
+#include <linux/mmc/slot-gpio.h>
 #include <linux/platform_data/pxa_sdhci.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_gpio.h>
 
 #include "sdhci.h"
 #include "sdhci-pltfm.h"
@@ -182,6 +184,7 @@ static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
 	struct device_node *np = dev->of_node;
 	u32 bus_width;
 	u32 clk_delay_cycles;
+	enum of_gpio_flags gpio_flags;
 
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
@@ -198,6 +201,10 @@ static struct sdhci_pxa_platdata *pxav3_get_mmc_pdata(struct device *dev)
 	if (clk_delay_cycles > 0)
 		pdata->clk_delay_cycles = clk_delay_cycles;
 
+	pdata->ext_cd_gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &gpio_flags);
+	if (gpio_flags != OF_GPIO_ACTIVE_LOW)
+		pdata->host_caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+
 	return pdata;
 }
 #else
@@ -266,8 +273,19 @@ static int __devinit sdhci_pxav3_probe(struct platform_device *pdev)
 			host->quirks |= pdata->quirks;
 		if (pdata->host_caps)
 			host->mmc->caps |= pdata->host_caps;
+		if (pdata->host_caps2)
+			host->mmc->caps2 |= pdata->host_caps2;
 		if (pdata->pm_caps)
 			host->mmc->pm_caps |= pdata->pm_caps;
+
+		if (gpio_is_valid(pdata->ext_cd_gpio)) {
+			ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio);
+			if (ret) {
+				dev_err(mmc_dev(host->mmc),
+					"failed to allocate card detect gpio\n");
+				goto err_cd_req;
+			}
+		}
 	}
 
 	host->ops = &pxav3_sdhci_ops;
@@ -285,6 +303,8 @@ static int __devinit sdhci_pxav3_probe(struct platform_device *pdev)
 err_add_host:
 	clk_disable_unprepare(clk);
 	clk_put(clk);
+	mmc_gpio_free_cd(host->mmc);
+err_cd_req:
 err_clk_get:
 	sdhci_pltfm_free(pdev);
 	kfree(pxa);
@@ -296,11 +316,16 @@ static int __devexit sdhci_pxav3_remove(struct platform_device *pdev)
 	struct sdhci_host *host = platform_get_drvdata(pdev);
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_pxa *pxa = pltfm_host->priv;
+	struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
 
 	sdhci_remove_host(host, 1);
 
 	clk_disable_unprepare(pltfm_host->clk);
 	clk_put(pltfm_host->clk);
+
+	if (gpio_is_valid(pdata->ext_cd_gpio))
+		mmc_gpio_free_cd(host->mmc);
+
 	sdhci_pltfm_free(pdev);
 	kfree(pxa);
 

include/linux/platform_data/pxa_sdhci.h

@@ -49,6 +49,7 @@ struct sdhci_pxa_platdata {
 	bool		ext_cd_gpio_invert;
 	unsigned int	max_speed;
 	unsigned int	host_caps;
+	unsigned int	host_caps2;
 	unsigned int	quirks;
 	unsigned int	pm_caps;
 };