[PATCH 5.4 075/134] spi: bcm-qspi: Handle clock probe deferral

From: Greg Kroah-Hartman
Date: Tue Jun 16 2020 - 12:16:13 EST


From: Florian Fainelli <f.fainelli@xxxxxxxxx>

commit 0392727c261bab65a35cd4f82ee9459bc237591d upstream.

The clock provider may not be ready by the time spi-bcm-qspi gets
probed, handle probe deferral using devm_clk_get_optional().

Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Signed-off-by: Kamal Dasu <kdasu.kdev@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20200420190853.45614-2-kdasu.kdev@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/spi/spi-bcm-qspi.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)

--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -1220,6 +1220,11 @@ int bcm_qspi_probe(struct platform_devic
}

qspi = spi_master_get_devdata(master);
+
+ qspi->clk = devm_clk_get_optional(&pdev->dev, NULL);
+ if (IS_ERR(qspi->clk))
+ return PTR_ERR(qspi->clk);
+
qspi->pdev = pdev;
qspi->trans_pos.trans = NULL;
qspi->trans_pos.byte = 0;
@@ -1332,13 +1337,6 @@ int bcm_qspi_probe(struct platform_devic
qspi->soc_intc = NULL;
}

- qspi->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(qspi->clk)) {
- dev_warn(dev, "unable to get clock\n");
- ret = PTR_ERR(qspi->clk);
- goto qspi_probe_err;
- }
-
ret = clk_prepare_enable(qspi->clk);
if (ret) {
dev_err(dev, "failed to prepare clock\n");