Messages in this thread Patch in this message | | | From | Frank Wunderlich <> | Subject | [RFC/RFT v2 09/11] dt-bindings: pci: add lane-map to rockchip PCIe binding | Date | Tue, 26 Apr 2022 15:21:37 +0200 |
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From: Frank Wunderlich <frank-w@public-files.de>
Create new property for (rockchip) PCIe controller binding to define lane mapping.
Rockchip driver uses this for bifurcation (true/false) based on lanes should be splitted across controllers or not.
On rk3568 there are 2 PCIe Controllers which share 2 PCIe lanes.
pcie3x1: pcie@fe270000 //lane1 when using 1+1 pcie3x2: pcie@fe280000 //lane0 when using 1+1
This ends up in one Controller (pcie3x1) uses lane-map = <0 1>; and the other lane-map = <1 0>; (pcie3x2)
This means there are 2 lanes (count of numbers), one (by position) is mapped to the first controller, the other one is used on the other controller.
In rockchip PCIe driver the lane-map is simply converted to the bifurcation bool instead of direct mapping a specific lane to a controller.
There is not yet any slot mapping below one controller. But for binding this may be possible like:
lane-map = <1 2 3 3 4 4 4 4>; | | | ... lane0 | | lane1 | lane2
on a 8-lane phy.
This can map lane0 to port1 (number used at this position), lane1 to port2, lanes 2+3 to port 3 and lanes 4,5,6,7 to port 4.
Signed-off-by: Frank Wunderlich <frank-w@public-files.de> --- v2: - new patch --- Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml index a992970e8b85..998b20b3a9dc 100644 --- a/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml +++ b/Documentation/devicetree/bindings/pci/rockchip-dw-pcie.yaml @@ -52,6 +52,8 @@ properties: - const: pclk - const: aux + lane-map: true + msi-map: true num-lanes: true @@ -74,8 +76,6 @@ properties: reset-names: const: pipe - bifurcation: true - vpcie3v3-supply: true required: @@ -115,6 +115,7 @@ examples: "aclk_dbi", "pclk", "aux"; device_type = "pci"; + lane-map = <0 1>; linux,pci-domain = <2>; max-link-speed = <2>; msi-map = <0x2000 &its 0x2000 0x1000>; -- 2.25.1
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