drivers: Defer probe if firmware is not ready

[zynq/linux.git] / drivers / nvmem / zynqmp_nvmem.c

diff --git a/drivers/nvmem/zynqmp_nvmem.c b/drivers/nvmem/zynqmp_nvmem.c
index 490c8fcaec80178b7a8ebd88a3fd209287334c99..5893543918c8dc1d570b0b8ce743536c8b5c95b0 100644 (file)
--- a/drivers/nvmem/zynqmp_nvmem.c
+++ b/drivers/nvmem/zynqmp_nvmem.c
@@ -16,6 +16,8 @@ struct zynqmp_nvmem_data {
        struct nvmem_device *nvmem;
 };
 
+static const struct zynqmp_eemi_ops *eemi_ops;
+
 static int zynqmp_nvmem_read(void *context, unsigned int offset,
                             void *val, size_t bytes)
 {
@@ -23,9 +25,7 @@ static int zynqmp_nvmem_read(void *context, unsigned int offset,
        int idcode, version;
        struct zynqmp_nvmem_data *priv = context;
 
-       const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
-
-       if (!eemi_ops || !eemi_ops->get_chipid)
+       if (!eemi_ops->get_chipid)
                return -ENXIO;
 
        ret = eemi_ops->get_chipid(&idcode, &version);
@@ -61,6 +61,10 @@ static int zynqmp_nvmem_probe(struct platform_device *pdev)
        if (!priv)
                return -ENOMEM;
 
+       eemi_ops = zynqmp_pm_get_eemi_ops();
+       if (IS_ERR(eemi_ops))
+               return PTR_ERR(eemi_ops);
+
        priv->dev = dev;
        econfig.dev = dev;
        econfig.reg_read = zynqmp_nvmem_read;