[PATCH v7 1/2] PCI: of: Remove max-link-speed generation validation

[Hans Zhang]

The of_pci_get_max_link_speed() function currently validates the
"max-link-speed" DT property to be in the range 1..4 (Gen1..Gen4).
This imposes a maintenance burden because each new PCIe generation
would require updating this validation.

Remove the range check so the function returns the raw property value
(or a negative error code if the property is missing or malformed).
Callers must now validate the returned speed against the range they
support.  A subsequent patch adds such validation to the DWC driver,
which is the primary user of this function.

This change allows future PCIe generations to be supported without
modifying drivers/pci/of.c.

Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
Acked-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
---
 drivers/pci/of.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 9f8eb5df279e..cff5fd337c2b 100644
--- a/drivers/pci/of.c
+++ b/drivers/pci/of.c
@@ -889,10 +889,11 @@ EXPORT_SYMBOL_GPL(of_pci_supply_present);
 int of_pci_get_max_link_speed(struct device_node *node)
 {
 	u32 max_link_speed;
+	int ret;
 
-	if (of_property_read_u32(node, "max-link-speed", &max_link_speed) ||
-	    max_link_speed == 0 || max_link_speed > 4)
-		return -EINVAL;
+	ret = of_property_read_u32(node, "max-link-speed", &max_link_speed);
+	if (ret)
+		return ret;
 
 	return max_link_speed;
 }
-- 
2.34.1