linux-kernel - [PATCH v3 1/9] dt-bindings: PCI: renesas,pci-rcar-gen2: Add depends-on for RZ/N1 SoC family

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Date:   Wed,  7 Dec 2022 17:24:27 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Herve Codina <herve.codina@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Gareth Williams <gareth.williams.jx@...esas.com>
Cc:     linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v3 1/9] dt-bindings: PCI: renesas,pci-rcar-gen2: Add depends-on for RZ/N1 SoC family

In RZ/N1 SoC family, a h2mode setting is available to change the
USB configuration from one host and one device to two hosts.
This change will be done at sysctrl level and must not be done
while USB host or device are running.

In order to express this dependency (probe order dependency),
introduce 'depends-on' property at PCI bridge level.

Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 .../devicetree/bindings/pci/renesas,pci-rcar-gen2.yaml      | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/renesas,pci-rcar-gen2.yaml b/Documentation/devicetree/bindings/pci/renesas,pci-rcar-gen2.yaml
index 0f18cceba3d5..e1221ad68465 100644
--- a/Documentation/devicetree/bindings/pci/renesas,pci-rcar-gen2.yaml
+++ b/Documentation/devicetree/bindings/pci/renesas,pci-rcar-gen2.yaml
@@ -130,6 +130,12 @@ allOf:
             - const: hclkh
             - const: hclkpm
             - const: pciclk
+        depends-on:
+          $ref: /schemas/types.yaml#/definitions/phandle
+          description:
+            Phandle to the node (sysctrl node) that set the 'h2mode' value in
+            order to express the fact that sysctrl must set the 'h2mode' before
+            the underlying USB hosts start.
       required:
         - clock-names
     else:
-- 
2.38.1