[PATCH 3/6] mmc: sdhci-brcmstb: Fix driver to defer on clk_get defer

[Al Cooper <alcooperx@gmail.com>]

The new SCMI clock protocol driver does not get probed that early in
boot. Brcmstb drivers typically have the following code when getting
a clock:

        priv->clk = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(priv->clk)) {
                dev_err(&pdev->dev, "Clock not found in Device Tree\n");
                priv->clk = NULL;
        }

This commit changes the driver to do what is below.

        priv->clk = devm_clk_get(&pdev->dev, NULL);
        if (IS_ERR(priv->clk)) {
                if (PTR_ERR(priv->clk) == -EPROBE_DEFER)
                        return -EPROBE_DEFER;
                dev_err(&pdev->dev, "Clock not found in Device Tree\n");
                priv->clk = NULL;
        }

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/mmc/host/sdhci-brcmstb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index daa89ca232a2..218176b79b6a 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -91,6 +91,8 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
 
 	clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(clk)) {
+		if (PTR_ERR(clk) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
 		dev_err(&pdev->dev, "Clock not found in Device Tree\n");
 		clk = NULL;
 	}
-- 
2.17.1