[PATCH v4 2/3] mmc: dw_mmc-k3: before set biu_clk rate, check biu_clk available or not

["ping.gao" <ping.gao@samsung.com>]

From: Ping Gao <ping.gao@samsung.com>

If biu_clk is not available, no need to try to set and get
rate of it, just bail out and print a warning

Signed-off-by: Ping Gao <ping.gao@samsung.com>
---
 drivers/mmc/host/dw_mmc-k3.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index ad6aa1aea549..ccb6bfe3e0ce 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -190,6 +190,11 @@ static void dw_mci_hi6220_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 	int ret;
 	unsigned int clock;
 
+	if (IS_ERR_OR_NULL(host->biu_clk)) {
+		dev_err(host->dev, "biu_clk not available\n");
+		return;
+	}
+
 	clock = (ios->clock <= 25000000) ? 25000000 : ios->clock;
 
 	ret = clk_set_rate(host->biu_clk, clock);
-- 
2.50.1