On Fri, Dec 20, 2019 at 4:03 PM Maxime Ripard <maxime@xxxxxxxxxx> wrote: > > Hi, > > On Thu, Dec 19, 2019 at 11:24:52PM +0800, Chen-Yu Tsai wrote: > > On Thu, Dec 19, 2019 at 4:43 PM Maxime Ripard <maxime@xxxxxxxxxx> wrote: > > > > > > The Allwinner A80 SoCs have a USB PHY controller that is used by Linux, > > > with a matching Device Tree binding. > > > > > > Now that we have the DT validation in place, let's convert the device tree > > > bindings for that controller over to a YAML schemas. > > > > > > Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx> > > > --- > > > .../phy/allwinner,sun9i-a80-usb-phy.yaml | 135 ++++++++++++++++++ > > > .../devicetree/bindings/phy/sun9i-usb-phy.txt | 37 ----- > > > 2 files changed, 135 insertions(+), 37 deletions(-) > > > create mode 100644 Documentation/devicetree/bindings/phy/allwinner,sun9i-a80-usb-phy.yaml > > > delete mode 100644 Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt > > > > > > diff --git a/Documentation/devicetree/bindings/phy/allwinner,sun9i-a80-usb-phy.yaml b/Documentation/devicetree/bindings/phy/allwinner,sun9i-a80-usb-phy.yaml > > > new file mode 100644 > > > index 000000000000..ded7d6f0a119 > > > --- /dev/null > > > +++ b/Documentation/devicetree/bindings/phy/allwinner,sun9i-a80-usb-phy.yaml > > > @@ -0,0 +1,135 @@ > > > +# SPDX-License-Identifier: GPL-2.0 > > > +%YAML 1.2 > > > +--- > > > +$id: http://devicetree.org/schemas/phy/allwinner,sun9i-a80-usb-phy.yaml# > > > +$schema: http://devicetree.org/meta-schemas/core.yaml# > > > + > > > +title: Allwinner A80 USB PHY Device Tree Bindings > > > + > > > +maintainers: > > > + - Chen-Yu Tsai <wens@xxxxxxxx> > > > + - Maxime Ripard <mripard@xxxxxxxxxx> > > > + > > > +properties: > > > + "#phy-cells": > > > + const: 0 > > > + > > > + compatible: > > > + const: allwinner,sun9i-a80-usb-phy > > > + > > > + reg: > > > + maxItems: 1 > > > + > > > + clocks: > > > + anyOf: > > > + - description: Main PHY Clock > > > + > > > + - items: > > > + - description: Main PHY clock > > > + - description: HSIC 12MHz clock > > > + - description: HSIC 480MHz clock > > > + > > > + clock-names: > > > + oneOf: > > > + - const: phy > > > + > > > + - items: > > > + - const: phy > > > + - const: hsic_12M > > > + - const: hsic_480M > > > + > > > + resets: > > > + anyOf: > > > + - description: Normal USB PHY reset > > > + > > > + - items: > > > + - description: Normal USB PHY reset > > > + - description: HSIC Reset > > > + > > > + reset-names: > > > + oneOf: > > > + - const: phy > > > + > > > + - items: > > > + - const: phy > > > + - const: hsic > > > + > > > + phy_type: > > > + const: hsic > > > + description: > > > + When absent, the PHY type will be assumed to be normal USB. > > > + > > > + phy-supply: > > > + description: > > > + Regulator that powers VBUS > > > + > > > +required: > > > + - "#phy-cells" > > > + - compatible > > > + - reg > > > + - clocks > > > + - clock-names > > > + - resets > > > + - reset-names > > > + > > > +additionalProperties: false > > > + > > > +if: > > > + properties: > > > + phy_type: > > > + const: hsic > > > + > > > + required: > > > + - phy_type > > > + > > > +then: > > > + properties: > > > + clocks: > > > + maxItems: 3 > > > + > > > + clock-names: > > > + maxItems: 3 > > > + > > > + resets: > > > + maxItems: 2 > > > + > > > + reset-names: > > > + maxItems: 2 > > > > So this is slightly incorrect. If phy_type == "hsic", then the > > "phy" clock and reset should not be needed. I say should because > > no boards actually came with HSIC implemented. The A80 Optimus > > board had the HSIC lines on one of the GPIO headers, but I never > > had any HSIC chips lol. > > This isn't what the previous binding was saying though :/ >From the original binding: - clock-names : depending on the "phy_type" property, * "phy" for normal USB * "hsic_480M", "hsic_12M" for HSIC - resets : a list of phandle + reset specifier pairs - reset-names : depending on the "phy_type" property, * "phy" for normal USB * "hsic" for HSIC It is recommended to list all clocks and resets available. The driver will only use those matching the phy_type. > > > -- phy_type : "hsic" for HSIC usage; > > > - other values or absence of this property indicates normal USB > > > -- clocks : phandle + clock specifier for the phy clocks > > > -- clock-names : depending on the "phy_type" property, > > > - * "phy" for normal USB > > > - * "hsic_480M", "hsic_12M" for HSIC > > > -- resets : a list of phandle + reset specifier pairs > > > -- reset-names : depending on the "phy_type" property, > > > - * "phy" for normal USB > > > - * "hsic" for HSIC > > It's speficied that the reset and clock is needed. If we want to > revise that, we can do it, but I guess it should be in a separate > patch than the one doing the conversion. Here we just want to express > the exact same thing. So the original binding only recommends having all clocks. But given that these are internal to the SoC, having them all is easier I suppose. ChenYu
