drivers: Defer probe if firmware is not ready

[zynq/linux.git] / drivers / soc / xilinx / zynqmp_power.c

diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c
index 771cb59b9d22eeb76ac7191c119241037544526d..1b9d14411a1526082e2d640089750126d32af4f3 100644 (file)
--- a/drivers/soc/xilinx/zynqmp_power.c
+++ b/drivers/soc/xilinx/zynqmp_power.c
@@ -31,6 +31,7 @@ static const char *const suspend_modes[] = {
 };
 
 static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;
+static const struct zynqmp_eemi_ops *eemi_ops;
 
 enum pm_api_cb_id {
        PM_INIT_SUSPEND_CB = 30,
@@ -92,9 +93,8 @@ static ssize_t suspend_mode_store(struct device *dev,
                                  const char *buf, size_t count)
 {
        int md, ret = -EINVAL;
-       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
 
-       if (!eemi_ops || !eemi_ops->set_suspend_mode)
+       if (!eemi_ops->set_suspend_mode)
                return ret;
 
        for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
@@ -120,9 +120,11 @@ static int zynqmp_pm_probe(struct platform_device *pdev)
        int ret, irq;
        u32 pm_api_version;
 
-       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
+       eemi_ops = zynqmp_pm_get_eemi_ops();
+       if (IS_ERR(eemi_ops))
+               return PTR_ERR(eemi_ops);
 
-       if (!eemi_ops || !eemi_ops->get_api_version || !eemi_ops->init_finalize)
+       if (!eemi_ops->get_api_version || !eemi_ops->init_finalize)
                return -ENXIO;
 
        eemi_ops->init_finalize();