[PATCH] mmc: sdhci-dove: use mmc_of_parse() and remove card_tasklet CD handler

[Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>]

Commit f8ec589b86f6
  "mmc: sdhci-dove: allow GPIOs to be used for card detection on Dove"
added a gpio based card detect interrupt handler that was hooked up
into card_tasket.

Commit 3560db8e247a
  "mmc: sdhci: push card_tasklet into threaded irq handler"
now removed that very card_tasklet causing sdhci-dove to fail on build
with:
drivers/mmc/host/sdhci-dove.c: In function 'sdhci_dove_carddetect_irq':
drivers/mmc/host/sdhci-dove.c:42:24: error: 'struct sdhci_host' has no member named 'card_tasklet'

To fix both the build error and get a working gpio card detection without
card_tasklet, replace sdhci_get_of_property() with more recent
mmc_of_parse(). It takes care of gpio-based card detect passed through DT
already and allows to remove the offending code sections dealing with
removed card_tasklet.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
---
This patch is based on todays mmc-next and fixes a build error there.

Cc: Chris Ball <chris@printf.net>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: linux-mmc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/mmc/host/sdhci-dove.c | 74 +++----------------------------------------
 1 file changed, 5 insertions(+), 69 deletions(-)

diff --git a/drivers/mmc/host/sdhci-dove.c b/drivers/mmc/host/sdhci-dove.c
index 0d315f4496c8..e6278ec007d7 100644
--- a/drivers/mmc/host/sdhci-dove.c
+++ b/drivers/mmc/host/sdhci-dove.c
@@ -21,28 +21,17 @@
 
 #include <linux/clk.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/io.h>
 #include <linux/mmc/host.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 
 #include "sdhci-pltfm.h"
 
 struct sdhci_dove_priv {
 	struct clk *clk;
-	int gpio_cd;
 };
 
-static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data)
-{
-	struct sdhci_host *host = data;
-
-	tasklet_schedule(&host->card_tasklet);
-	return IRQ_HANDLED;
-}
-
 static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
 {
 	u16 ret;
@@ -60,8 +49,6 @@ static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
 
 static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
 {
-	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
-	struct sdhci_dove_priv *priv = pltfm_host->priv;
 	u32 ret;
 
 	ret = readl(host->ioaddr + reg);
@@ -71,14 +58,6 @@ static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
 		/* Mask the support for 3.0V */
 		ret &= ~SDHCI_CAN_VDD_300;
 		break;
-	case SDHCI_PRESENT_STATE:
-		if (gpio_is_valid(priv->gpio_cd)) {
-			if (gpio_get_value(priv->gpio_cd) == 0)
-				ret |= SDHCI_CARD_PRESENT;
-			else
-				ret &= ~SDHCI_CARD_PRESENT;
-		}
-		break;
 	}
 	return ret;
 }
@@ -117,28 +96,9 @@ static int sdhci_dove_probe(struct platform_device *pdev)
 
 	priv->clk = devm_clk_get(&pdev->dev, NULL);
 
-	if (pdev->dev.of_node) {
-		priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node,
-						  "cd-gpios", 0);
-	} else {
-		priv->gpio_cd = -EINVAL;
-	}
-
-	if (gpio_is_valid(priv->gpio_cd)) {
-		ret = gpio_request(priv->gpio_cd, "sdhci-cd");
-		if (ret) {
-			dev_err(&pdev->dev, "card detect gpio request failed: %d\n",
-				ret);
-			return ret;
-		}
-		gpio_direction_input(priv->gpio_cd);
-	}
-
 	host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata, 0);
-	if (IS_ERR(host)) {
-		ret = PTR_ERR(host);
-		goto err_sdhci_pltfm_init;
-	}
+	if (IS_ERR(host))
+		return PTR_ERR(host);
 
 	pltfm_host = sdhci_priv(host);
 	pltfm_host->priv = priv;
@@ -146,39 +106,20 @@ static int sdhci_dove_probe(struct platform_device *pdev)
 	if (!IS_ERR(priv->clk))
 		clk_prepare_enable(priv->clk);
 
-	sdhci_get_of_property(pdev);
+	ret = mmc_of_parse(host->mmc);
+	if (ret)
+		goto err_sdhci_add;
 
 	ret = sdhci_add_host(host);
 	if (ret)
 		goto err_sdhci_add;
 
-	/*
-	 * We must request the IRQ after sdhci_add_host(), as the tasklet only
-	 * gets setup in sdhci_add_host() and we oops.
-	 */
-	if (gpio_is_valid(priv->gpio_cd)) {
-		ret = request_irq(gpio_to_irq(priv->gpio_cd),
-				  sdhci_dove_carddetect_irq,
-				  IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
-				  mmc_hostname(host->mmc), host);
-		if (ret) {
-			dev_err(&pdev->dev, "card detect irq request failed: %d\n",
-				ret);
-			goto err_request_irq;
-		}
-	}
-
 	return 0;
 
-err_request_irq:
-	sdhci_remove_host(host, 0);
 err_sdhci_add:
 	if (!IS_ERR(priv->clk))
 		clk_disable_unprepare(priv->clk);
 	sdhci_pltfm_free(pdev);
-err_sdhci_pltfm_init:
-	if (gpio_is_valid(priv->gpio_cd))
-		gpio_free(priv->gpio_cd);
 	return ret;
 }
 
@@ -190,11 +131,6 @@ static int sdhci_dove_remove(struct platform_device *pdev)
 
 	sdhci_pltfm_unregister(pdev);
 
-	if (gpio_is_valid(priv->gpio_cd)) {
-		free_irq(gpio_to_irq(priv->gpio_cd), host);
-		gpio_free(priv->gpio_cd);
-	}
-
 	if (!IS_ERR(priv->clk))
 		clk_disable_unprepare(priv->clk);
 
-- 
1.9.1