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Subject[PATCH 02/18] spi: stm32-spi: defer probe for reset
Date
Defer the probe operation when a reset controller device is expected
but have not yet been probed.

This change replaces use of devm_reset_control_get_exclusive() with
devm_reset_control_get_optional_exclusive() as reset controller is
optional which is now explicitly stated.

Signed-off-by: Alain Volmat <alain.volmat@st.com>
---
drivers/spi/spi-stm32.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
index 838d3ce3ebae..eaa416c551c9 100644
--- a/drivers/spi/spi-stm32.c
+++ b/drivers/spi/spi-stm32.c
@@ -1886,8 +1886,16 @@ static int stm32_spi_probe(struct platform_device *pdev)
goto err_clk_disable;
}

- rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
- if (!IS_ERR(rst)) {
+ rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
+ if (rst) {
+ if (IS_ERR(rst)) {
+ ret = PTR_ERR(rst);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "reset get failed: %d\n",
+ ret);
+ goto err_clk_disable;
+ }
+
reset_control_assert(rst);
udelay(2);
reset_control_deassert(rst);
--
2.7.4
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