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From:   Amelie Delaunay <amelie.delaunay@foss.st.com>
To:     Kishon Vijay Abraham I <kishon@ti.com>,
        Vinod Koul <vkoul@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>
CC:     <linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        Amelie Delaunay <amelie.delaunay@foss.st.com>
Subject: [PATCH v2 1/6] dt-bindings: phy: phy-stm32-usbphyc: move PLL supplies to parent node
Date:   Tue, 5 Jan 2021 10:05:20 +0100
Message-ID: <20210105090525.23164-2-amelie.delaunay@foss.st.com>
In-Reply-To: <20210105090525.23164-1-amelie.delaunay@foss.st.com>
References: <20210105090525.23164-1-amelie.delaunay@foss.st.com>
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PLL block requires to be powered with 1v1 and 1v8 supplies to catch ENABLE
signal.
Currently, supplies are managed through phy_ops .power_on/off, and PLL
activation/deactivation is managed through phy_ops .init/exit.
The sequence of phy_ops .power_on/.phy_init, .power_off/.exit is USB
drivers dependent.
To ensure a good behavior of the PLL, supplies have to be managed at PLL
activation/deactivation. That means the supplies need to be put in usbphyc
parent node and not in phy children nodes.

Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Note that even with bindings change, it doesn't break the backward
compatibility: old device trees are still compatible, USB is still
functional. Device trees will be updated with this new bindings
when approved.
---
 .../bindings/phy/phy-stm32-usbphyc.yaml       | 22 +++++++++----------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
index 0ba61979b970..46df6786727a 100644
--- a/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
+++ b/Documentation/devicetree/bindings/phy/phy-stm32-usbphyc.yaml
@@ -45,6 +45,12 @@ properties:
   "#size-cells":
     const: 0
 
+  vdda1v1-supply:
+    description: regulator providing 1V1 power supply to the PLL block
+
+  vdda1v8-supply:
+    description: regulator providing 1V8 power supply to the PLL block
+
 #Required child nodes:
 
 patternProperties:
@@ -61,12 +67,6 @@ patternProperties:
       phy-supply:
         description: regulator providing 3V3 power supply to the PHY.
 
-      vdda1v1-supply:
-        description: regulator providing 1V1 power supply to the PLL block
-
-      vdda1v8-supply:
-        description: regulator providing 1V8 power supply to the PLL block
-
       "#phy-cells":
         enum: [ 0x0, 0x1 ]
 
@@ -90,8 +90,6 @@ patternProperties:
     required:
       - reg
       - phy-supply
-      - vdda1v1-supply
-      - vdda1v8-supply
       - "#phy-cells"
 
     additionalProperties: false
@@ -102,6 +100,8 @@ required:
   - clocks
   - "#address-cells"
   - "#size-cells"
+  - vdda1v1-supply
+  - vdda1v8-supply
   - usb-phy@0
   - usb-phy@1
 
@@ -116,22 +116,20 @@ examples:
         reg = <0x5a006000 0x1000>;
         clocks = <&rcc USBPHY_K>;
         resets = <&rcc USBPHY_R>;
+        vdda1v1-supply = <&reg11>;
+        vdda1v8-supply = <&reg18>;
         #address-cells = <1>;
         #size-cells = <0>;
 
         usbphyc_port0: usb-phy@0 {
             reg = <0>;
             phy-supply = <&vdd_usb>;
-            vdda1v1-supply = <&reg11>;
-            vdda1v8-supply = <&reg18>;
             #phy-cells = <0>;
         };
 
         usbphyc_port1: usb-phy@1 {
             reg = <1>;
             phy-supply = <&vdd_usb>;
-            vdda1v1-supply = <&reg11>;
-            vdda1v8-supply = <&reg18>;
             #phy-cells = <1>;
         };
     };
-- 
2.17.1