[PATCH 2/2] MMC: davinci: request gpios using gpio descriptors

[Axel Haslam]

Request card detect and write protect gpios using the provided API
by mmc core.

If a gpio is provided for card detect, we don't need to poll.
So only use polling when a gpio is not provided.

Once all pdata users register the gpios using gpio descriptors,
we could remove the platform callbacks.

Signed-off-by: Axel Haslam <ahas...@baylibre.com>
---
 drivers/mmc/host/davinci_mmc.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 619e50e..36b5af8 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -1167,6 +1167,7 @@ static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
        struct platform_device *pdev = to_platform_device(mmc->parent);
        struct davinci_mmc_config *pdata = pdev->dev.platform_data;
        struct mmc_davinci_host *host;
+       int ret;
 
        if (!pdata)
                return -EINVAL;
@@ -1184,7 +1185,6 @@ static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
        if (pdata && (pdata->wires == 8))
                mmc->caps |= (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA);
 
-       mmc->caps |= MMC_CAP_NEEDS_POLL;
        mmc->f_min = 312500;
        mmc->f_max = 25000000;
        if (pdata && pdata->max_freq)
@@ -1192,6 +1192,17 @@ static int mmc_davinci_parse_pdata(struct mmc_host *mmc)
        if (pdata && pdata->caps)
                mmc->caps |= pdata->caps;
 
+       /* Register a cd gpio, if there is not one, enable polling */
+       ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+       if (ret == -EPROBE_DEFER)
+               return ret;
+       else if (ret)
+               mmc->caps |= MMC_CAP_NEEDS_POLL;
+
+       ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL);
+       if (ret == -EPROBE_DEFER)
+               return ret;
+
        return 0;
 }
 
-- 
2.10.1