mmc: tmio: use generic GPIO CD and WP handlers

The tmio-mmc driver is already using the generic GPIO CD handler in IRQ
mode. This patch adds support for CD polling mode and also checks for
availability of a WP GPIO.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/tmio_mmc_pio.c

@@ -875,6 +875,9 @@ static int tmio_mmc_get_ro(struct mmc_host *mmc)
 {
 	struct tmio_mmc_host *host = mmc_priv(mmc);
 	struct tmio_mmc_data *pdata = host->pdata;
+	int ret = mmc_gpio_get_ro(mmc);
+	if (ret >= 0)
+		return ret;
 
 	return !((pdata->flags & TMIO_MMC_WRPROTECT_DISABLE) ||
 		 (sd_ctrl_read32(host, CTL_STATUS) & TMIO_STAT_WRPROTECT));
@@ -884,6 +887,9 @@ static int tmio_mmc_get_cd(struct mmc_host *mmc)
 {
 	struct tmio_mmc_host *host = mmc_priv(mmc);
 	struct tmio_mmc_data *pdata = host->pdata;
+	int ret = mmc_gpio_get_cd(mmc);
+	if (ret >= 0)
+		return ret;
 
 	if (!pdata->get_cd)
 		return -ENOSYS;