spi: bcm-qspi: Handle clock probe deferral

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@gmail.com>
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200420190853.45614-2-kdasu.kdev@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c
index afed1ea..4c0d0cc 100644 (file)
--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -1227,6 +1227,11 @@ int bcm_qspi_probe(struct platform_device *pdev,
        }
 
        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;
@@ -1340,13 +1345,6 @@ int bcm_qspi_probe(struct platform_device *pdev,
                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");