linux-kernel - [PATCH v2 1/2] dt-bindings: PCI: microchip,pcie-host: fix reg properties

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Message-ID: <20240612-shrubs-liquid-95ed126a5544@spud>
Date: Wed, 12 Jun 2024 11:57:55 +0100
From: Conor Dooley <conor@...nel.org>
To: linux-pci@...r.kernel.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 1/2] dt-bindings: PCI: microchip,pcie-host: fix reg properties

From: Conor Dooley <conor.dooley@...rochip.com>

The PCI host controller on PolarFire SoC has multiple "instances", each
with their own bridge and ctrl address spaces. The original binding has
an "apb" register region, and it is expected to be set to the base
address of the host controllers register space. Some defines in the
Linux driver were used to compute the addresses of the bridge and ctrl
address ranges corresponding to instance1. Some customers want to use
instance2 however and that requires changing the defines in the driver,
which is clearly not a portable solution.

Remove this "apb" register region from the binding and add "bridge" &
"ctrl" regions instead, that will directly communicate the address of
these regions

Fixes: 6ee6c89aac35 ("dt-bindings: PCI: microchip: Add Microchip PolarFire host binding")
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 .../devicetree/bindings/pci/microchip,pcie-host.yaml   | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
index 5d7aec5f54e7..45c14b6e4aa4 100644
--- a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
+++ b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
@@ -18,12 +18,13 @@ properties:
     const: microchip,pcie-host-1.0 # PolarFire
 
   reg:
-    maxItems: 2
+    maxItems: 3
 
   reg-names:
     items:
       - const: cfg
-      - const: apb
+      - const: bridge
+      - const: ctrl
 
   clocks:
     description:
@@ -115,8 +116,9 @@ examples:
             pcie0: pcie@...0000000 {
                     compatible = "microchip,pcie-host-1.0";
                     reg = <0x0 0x70000000 0x0 0x08000000>,
-                          <0x0 0x43000000 0x0 0x00010000>;
-                    reg-names = "cfg", "apb";
+                          <0x0 0x43008000 0x0 0x00002000>,
+                          <0x0 0x4300a000 0x0 0x00002000>;
+                    reg-names = "cfg", "bridge", "ctrl";
                     device_type = "pci";
                     #address-cells = <3>;
                     #size-cells = <2>;
-- 
2.43.0