mmc: omap_hsmmc: Delete platform data GPIO CD and WP

The OMAP HSMMC driver has some elaborate and hairy handling for
passing GPIO card detect and write protect lines from a boardfile
into the driver: the machine defines a struct omap2_hsmmc_info
that is copied into struct omap_hsmmc_platform_data by
omap_hsmmc_pdata_init() in arch/arm/mach-omap2/hsmmc.c.

However the .gpio_cd and .gpio_wp fields are not copied from
omap2_hsmmc_info to omap_hsmmc_platform_data by
omap_hsmmc_pdata_init() so they remain unused. The only platform
defining omap2_hsmmc_info also define both to -1, unused.

It turn out there are no boardfiles passing any valid GPIO
lines into the OMAP HSMMC driver at all. And since we are not
going to add any more OMAP2 boardfiles, we can delete this
card detect and write protect handling altogether.

This seems to also fix a bug: the card detect callback
mmc_gpio_get_cd() in the slot GPIO core needs to be called
by drivers utilizing slot GPIO. It appears the the boardfile
quirks were not doing this right, so this would only get
called for boardfiles, i.e. since no boardfile was using it,
never.

Just assign mmc_gpio_get_cd() unconditionally to omap_hsmmc_ops
.get_cd() so card detects from the device tree works.
AFAICT card detect with GPIO lines assigned from
mmc_of_parse() are not working at the moment, but that is
no regression since it probably never worked.

Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

arch/arm/mach-omap2/hsmmc.h

@@ -12,8 +12,6 @@ struct omap2_hsmmc_info {
 	u8	mmc;		/* controller 1/2/3 */
 	u32	caps;		/* 4/8 wires and any additional host
 				 * capabilities OR'd (ref. linux/mmc/host.h) */
-	int	gpio_cd;	/* or -EINVAL */
-	int	gpio_wp;	/* or -EINVAL */
 	struct platform_device *pdev;	/* mmc controller instance */
 	/* init some special card */
 	void (*init_card)(struct mmc_card *card);

arch/arm/mach-omap2/pdata-quirks.c

@@ -363,8 +363,6 @@ static struct omap2_hsmmc_info pandora_mmc3[] = {
 	{
 		.mmc		= 3,
 		.caps		= MMC_CAP_4_BIT_DATA | MMC_CAP_POWER_OFF_CARD,
-		.gpio_cd	= -EINVAL,
-		.gpio_wp	= -EINVAL,
 		.init_card	= pandora_wl1251_init_card,
 	},
 	{}	/* Terminator */

drivers/mmc/host/omap_hsmmc.c

@@ -30,7 +30,6 @@
 #include <linux/clk.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
-#include <linux/of_gpio.h>
 #include <linux/of_device.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/core.h>
@@ -38,7 +37,6 @@
 #include <linux/mmc/slot-gpio.h>
 #include <linux/io.h>
 #include <linux/irq.h>
-#include <linux/gpio.h>
 #include <linux/regulator/consumer.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/pm_runtime.h>
@@ -206,7 +204,6 @@ struct omap_hsmmc_host {
 #define HSMMC_SDIO_IRQ_ENABLED	(1 << 1)        /* SDIO irq enabled */
 	struct omap_hsmmc_next	next_data;
 	struct	omap_hsmmc_platform_data	*pdata;
-	int (*card_detect)(struct device *dev);
 };
 
 struct omap_mmc_of_data {
@@ -216,13 +213,6 @@ struct omap_mmc_of_data {
 
 static void omap_hsmmc_start_dma_transfer(struct omap_hsmmc_host *host);
 
-static int omap_hsmmc_card_detect(struct device *dev)
-{
-	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
-
-	return mmc_gpio_get_cd(host->mmc);
-}
-
 static int omap_hsmmc_enable_supply(struct mmc_host *mmc)
 {
 	int ret;
@@ -467,29 +457,6 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 	return 0;
 }
 
-static int omap_hsmmc_gpio_init(struct mmc_host *mmc,
-				struct omap_hsmmc_host *host,
-				struct omap_hsmmc_platform_data *pdata)
-{
-	int ret;
-
-	if (gpio_is_valid(pdata->gpio_cd)) {
-		ret = mmc_gpio_request_cd(mmc, pdata->gpio_cd, 0);
-		if (ret)
-			return ret;
-
-		host->card_detect = omap_hsmmc_card_detect;
-	}
-
-	if (gpio_is_valid(pdata->gpio_wp)) {
-		ret = mmc_gpio_request_ro(mmc, pdata->gpio_wp);
-		if (ret)
-			return ret;
-	}
-
-	return 0;
-}
-
 /*
  * Start clock to the card
  */
@@ -1539,15 +1506,6 @@ static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 	omap_hsmmc_set_bus_mode(host);
 }
 
-static int omap_hsmmc_get_cd(struct mmc_host *mmc)
-{
-	struct omap_hsmmc_host *host = mmc_priv(mmc);
-
-	if (!host->card_detect)
-		return -ENOSYS;
-	return host->card_detect(host->dev);
-}
-
 static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
 {
 	struct omap_hsmmc_host *host = mmc_priv(mmc);
@@ -1686,7 +1644,7 @@ static struct mmc_host_ops omap_hsmmc_ops = {
 	.pre_req = omap_hsmmc_pre_req,
 	.request = omap_hsmmc_request,
 	.set_ios = omap_hsmmc_set_ios,
-	.get_cd = omap_hsmmc_get_cd,
+	.get_cd = mmc_gpio_get_cd,
 	.get_ro = mmc_gpio_get_ro,
 	.init_card = omap_hsmmc_init_card,
 	.enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
@@ -1813,9 +1771,6 @@ static struct omap_hsmmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
 	if (of_find_property(np, "ti,dual-volt", NULL))
 		pdata->controller_flags |= OMAP_HSMMC_SUPPORTS_DUAL_VOLT;
 
-	pdata->gpio_cd = -EINVAL;
-	pdata->gpio_wp = -EINVAL;
-
 	if (of_find_property(np, "ti,non-removable", NULL)) {
 		pdata->nonremovable = true;
 		pdata->no_regulator_off_init = true;
@@ -1900,10 +1855,6 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	host->pbias_enabled = 0;
 	host->vqmmc_enabled = 0;
 
-	ret = omap_hsmmc_gpio_init(mmc, host, pdata);
-	if (ret)
-		goto err_gpio;
-
 	platform_set_drvdata(pdev, host);
 
 	if (pdev->dev.of_node)
@@ -2045,7 +1996,6 @@ err_irq:
 	if (host->dbclk)
 		clk_disable_unprepare(host->dbclk);
 err1:
-err_gpio:
 	mmc_free_host(mmc);
 err:
 	return ret;

include/linux/platform_data/hsmmc-omap.h

@@ -70,8 +70,6 @@ struct omap_hsmmc_platform_data {
 	/* string specifying a particular variant of hardware */
 	char *version;
 
-	int gpio_cd;			/* gpio (card detect) */
-	int gpio_wp;			/* gpio (write protect) */
 	/* if we have special card, init it using this callback */
 	void (*init_card)(struct mmc_card *card);