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spi: stm32-qspi: defer probe for reset controller 

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@st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Link: https://lore.kernel.org/r/20200203135048.1299-2-patrice.chotard@st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Etienne Carriere 2020-02-03 14:50:47 +01:00 committed by Mark Brown
parent ea1e5b3354
commit 8196f7bcc2
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GPG Key ID: 24D68B725D5487D0
1 changed files with 5 additions and 1 deletions
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6
drivers/spi/spi-stm32-qspi.c
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@ -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);