[U-Boot] [PATCH v2 05/34] dm: syscon: Don't require a regmap for PCI devices

Simon Glass sjg at chromium.org
Sun Feb 17 03:24:38 UTC 2019

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

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

Changes in v2: None

 drivers/core/syscon-uclass.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/core/syscon-uclass.c b/drivers/core/syscon-uclass.c
index 3cf9dd9dbe4..afac6d6e37e 100644
--- 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

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