dm: syscon: Don't require a regmap for PCI devices

At present it is not possible to use the syscon devices for PCI devices
since a regmap is required. Since PCI uses a 3-cell address the conversion
of the 'reg' property to an address always fails. In any case, the regmap
is not useful with PCI since devices are accessed through the PCI bus
which regmap does not support.

Add a special case for PCI syscon devices, so that they don't set up a
regmap.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/core/syscon-uclass.c b/drivers/core/syscon-uclass.c
index 3cf9dd9..afac6d6 100644 (file)
--- a/drivers/core/syscon-uclass.c
+++ b/drivers/core/syscon-uclass.c
@@ -37,6 +37,10 @@ static int syscon_pre_probe(struct udevice *dev)
 {
        struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
 
+       /* Special case for PCI devices, which don't have a regmap */
+       if (device_get_uclass_id(dev->parent) == UCLASS_PCI)
+               return 0;
+
        /*
         * With OF_PLATDATA we really have no way of knowing the format of
         * the device-specific platform data. So we assume that it starts with