linux-kernel - [PATCH V2 1/8] dt-bindings: PHY: P2U: Add support for Tegra234 P2U block

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Date:   Sat, 23 Apr 2022 18:18:51 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <lorenzo.pieralisi@....com>,
        <robh+dt@...nel.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>
CC:     <kishon@...com>, <vkoul@...nel.org>, <kw@...ux.com>,
        <krzk@...nel.org>, <p.zabel@...gutronix.de>,
        <mperttunen@...dia.com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
        <sagar.tv@...il.com>
Subject: [PATCH V2 1/8] dt-bindings: PHY: P2U: Add support for Tegra234 P2U block

Add support for Tegra234 P2U (PIPE to UPHY) module block which is a glue
module instantiated once for each PCIe lane between Synopsys DesignWare
core based PCIe IP and Universal PHY block.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
V2:
* Addressed review comments from Rob and Raul
* Ran 'dt_binding_check' and 'dtbs_check' on this change

 .../bindings/phy/phy-tegra194-p2u.yaml          | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.yaml b/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.yaml
index 9a89d05efbda..4dc5205d893b 100644
--- a/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.yaml
+++ b/Documentation/devicetree/bindings/phy/phy-tegra194-p2u.yaml
@@ -4,7 +4,7 @@
 $id: "http://devicetree.org/schemas/phy/phy-tegra194-p2u.yaml#"
 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
 
-title: NVIDIA Tegra194 P2U binding
+title: NVIDIA Tegra194 & Tegra234 P2U binding
 
 maintainers:
   - Thierry Reding <treding@...dia.com>
@@ -12,13 +12,17 @@ maintainers:
 description: >
   Tegra194 has two PHY bricks namely HSIO (High Speed IO) and NVHS (NVIDIA High
   Speed) each interfacing with 12 and 8 P2U instances respectively.
+  Tegra234 has three PHY bricks namely HSIO, NVHS and GBE (Gigabit Ethernet)
+  each interfacing with 8, 8 and 8 P2U instances respectively.
   A P2U instance is a glue logic between Synopsys DesignWare Core PCIe IP's PIPE
-  interface and PHY of HSIO/NVHS bricks. Each P2U instance represents one PCIe
-  lane.
+  interface and PHY of HSIO/NVHS/GBE bricks. Each P2U instance represents one
+  PCIe lane.
 
 properties:
   compatible:
-    const: nvidia,tegra194-p2u
+    enum:
+      - nvidia,tegra194-p2u
+      - nvidia,tegra234-p2u
 
   reg:
     maxItems: 1
@@ -28,6 +32,11 @@ properties:
     items:
       - const: ctl
 
+  nvidia,skip-sz-protect-en:
+    description: Should be present if two PCIe retimers are present between
+      the root port and its immediate downstream device.
+    type: boolean
+
   '#phy-cells':
     const: 0
 
-- 
2.17.1