[PATCH] gpio: mxc: add check to return defer probe if clock tree NOT ready

[Anson Huang]

On i.MX8MQ platform, clock driver uses platform driver
model and it is probed after GPIO driver, so when GPIO
driver fails to get clock, it should check the error type
to decide whether to return defer probe or just ignore
the clock operation.

Fixes: 2808801aab8a ("gpio: mxc: add clock operation")
Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
---
 drivers/gpio/gpio-mxc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 2d1dfa1..e86e61d 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -438,8 +438,11 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 
 	/* the controller clock is optional */
 	port->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(port->clk))
+	if (IS_ERR(port->clk)) {
+		if (PTR_ERR(port->clk) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
 		port->clk = NULL;
+	}
 
 	err = clk_prepare_enable(port->clk);
 	if (err) {
-- 
2.7.4