From d1ac0002dd297069bb8448c2764c9c31c4668441 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 19 Aug 2020 10:42:55 +0100 Subject: [PATCH] of: address: Work around missing device_type property in pcie nodes Recent changes to the DT PCI bus parsing made it mandatory for device tree nodes describing a PCI controller to have the 'device_type = "pci"' property for the node to be matched. Although this follows the letter of the specification, it breaks existing device-trees that have been working fine for years. Rockchip rk3399-based systems are a prime example of such collateral damage, and have stopped discovering their PCI bus. In order to paper over it, let's add a workaround to the code matching the device type, and accept as PCI any node that is named "pcie", A warning will hopefully nudge the user into updating their DT to a fixed version if they can, but the incentive is obviously pretty small. Fixes: 2f96593ecc37 ("of_address: Add bus type match for pci ranges parser") Suggested-by: Rob Herring Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20200819094255.474565-1-maz@kernel.org Signed-off-by: Rob Herring --- drivers/of/address.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/of/address.c b/drivers/of/address.c index 945b3d7..da4f734 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -128,15 +128,29 @@ static unsigned int of_bus_pci_get_flags(const __be32 *addr) * PCI bus specific translator */ +static bool of_node_is_pcie(struct device_node *np) +{ + bool is_pcie = of_node_name_eq(np, "pcie"); + + if (is_pcie) + pr_warn_once("%pOF: Missing device_type\n", np); + + return is_pcie; +} + static int of_bus_pci_match(struct device_node *np) { /* * "pciex" is PCI Express * "vci" is for the /chaos bridge on 1st-gen PCI powermacs * "ht" is hypertransport + * + * If none of the device_type match, and that the node name is + * "pcie", accept the device as PCI (with a warning). */ return of_node_is_type(np, "pci") || of_node_is_type(np, "pciex") || - of_node_is_type(np, "vci") || of_node_is_type(np, "ht"); + of_node_is_type(np, "vci") || of_node_is_type(np, "ht") || + of_node_is_pcie(np); } static void of_bus_pci_count_cells(struct device_node *np, -- 2.7.4