linux-kernel - Re: [RFC 1/2] usb: phy: Add Qualcomm SS-USB and HS-USB drivers for DWC3 core

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Message-ID: <20130806140301.GE25383@e106331-lin.cambridge.arm.com>
Date:	Tue, 6 Aug 2013 15:03:01 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
Cc:	"balbi@...com" <balbi@...com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [RFC 1/2] usb: phy: Add Qualcomm SS-USB and HS-USB drivers for
 DWC3 core

On Tue, Aug 06, 2013 at 12:53:10PM +0100, Ivan T. Ivanov wrote:
> From: "Ivan T. Ivanov" <iivanov@...sol.com>
>
> Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> ---
>  .../devicetree/bindings/usb/msm-ssusb.txt          |   49 +++
>  drivers/usb/phy/Kconfig                            |   11 +
>  drivers/usb/phy/Makefile                           |    2 +
>  drivers/usb/phy/phy-msm-dwc3-usb2.c                |  342 +++++++++++++++++
>  drivers/usb/phy/phy-msm-dwc3-usb3.c                |  389 ++++++++++++++++++++
>  5 files changed, 793 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/msm-ssusb.txt
>  create mode 100644 drivers/usb/phy/phy-msm-dwc3-usb2.c
>  create mode 100644 drivers/usb/phy/phy-msm-dwc3-usb3.c
>
> diff --git a/Documentation/devicetree/bindings/usb/msm-ssusb.txt b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
> new file mode 100644
> index 0000000..550b496
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
> @@ -0,0 +1,49 @@
> +MSM SuperSpeed USB3.0 SoC controllers
> +
> +Required properities :
> +- compatible sould be "qcom,dwc3-usb2";
> +- reg : offset and length of the register set in the memory map
> +- clocks: <&cxo>, <&usb2a_phy_sleep_cxc>;

Huh? That doesn't describe what these are. These would be better
explained with a reference to clock-names and a basic description as to
what the input's called, what it drives, etc, as you've done done for
the *-supply properties.

> +- clock-names: "xo", "sleep_a_clk";
> +<supply-name>-supply: phandle to the regulator device tree node
> +Required "supply-name" examples are:
> +       "v1p8" : 1.8v supply for HSPHY
> +       "v3p3" : 3.3v supply for HSPHY
> +       "vbus" : vbus supply for host mode
> +       "vddcx" : vdd supply for HS-PHY digital circuit operation
> +
> +Required properities :
> +- compatible sould be "qcom,dwc3-usb3";
> +- reg : offset and length of the register set in the memory map
> +- clocks: <&cxo>, <&usb30_mock_utmi_cxc>;

Similarly, this doesn't describe what the clocks are.

> +- clock-names: "xo", "ref_clk";
> +<supply-name>-supply: phandle to the regulator device tree node
> +Required "supply-name" examples are:
> +       "v1p8" : 1.8v supply for SS-PHY
> +       "vddcx" : vdd supply for SS-PHY digital circuit operation
> +
> +Example device nodes:
> +
> +       dwc3_usb2: phy@...f8800 {
> +               compatible = "qcom,dwc3-usb2";
> +               reg = <0xf92f8800 0x30>;
> +
> +               clocks = <&cxo>, <&usb2a_phy_sleep_cxc>;
> +               clock-names = "xo", "sleep_a_clk";
> +
> +               vbus-supply = <&supply>;
> +               vddcx-supply = <&supply>;
> +               v1p8-supply = <&supply>;
> +               v3p3-supply = <&supply>;
> +       };
> +
> +       dwc3_usb3: phy@...f8830 {
> +               compatible = "qcom,dwc3-usb3";
> +               reg = <0xf92f8830 0x30>;
> +
> +               clocks = <&cxo>, <&usb30_mock_utmi_cxc>;
> +               clock-names = "xo", "ref_clk";
> +
> +               vddcx-supply = <&supply>;
> +               v1p8-supply = <&supply>;
> +       };


Those regster banks look suspiciously close. Are these the same IP
block? Can they ever appear separately?

Do the drivers not trample each other when messing with shared clocks
and regulators?

Thanks,
Mark.
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