[PATCH] spi: stm32-qspi: defer probe for reset controller

[Etienne Carriere]

Changes stm32 QSPI driver to defer its probe operation when a reset
controller device have not yet probed but is registered in the
system.

Signed-off-by: Etienne Carriere <etienne.carriere@xxxxxx>
Signed-off-by: Patrice Chotard <patrice.chotard@xxxxxx>
Link: https://lore.kernel.org/r/20200203135048.1299-2-patrice.chotard@xxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 drivers/spi/spi-stm32-qspi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index 4ef569b47aa6..13bb64bf4c8f 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -615,7 +615,11 @@ static int stm32_qspi_probe(struct platform_device *pdev)
 	}
 
 	rstc = devm_reset_control_get_exclusive(dev, NULL);
-	if (!IS_ERR(rstc)) {
+	if (IS_ERR(rstc)) {
+		ret = PTR_ERR(rstc);
+		if (ret == -EPROBE_DEFER)
+			goto err;
+	} else {
 		reset_control_assert(rstc);
 		udelay(2);
 		reset_control_deassert(rstc);
-- 
2.20.1