linux-kernel - Re: [PATCH] phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver

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Date:	Fri, 18 Sep 2015 11:38:13 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>
CC:	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-sh@...r.kernel.org>
Subject: Re: [PATCH] phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver

Hi,

On Tuesday 25 August 2015 02:40 PM, Yoshihiro Shimoda wrote:
> This patch adds support for R-Car generation 3 USB2 PHY driver.
> This SoC has 3 EHCI/OHCI channels, and the channel 0 is shared
> with the HSUSB (USB2.0 peripheral) device.

>From the description it looks like it's a single PHY with multiple
channels. In that case you should have a singe dt node for the PHY
provider and each channel should be modelled as the child node of the
PHY provider dt node.
> 
> So, the purpose of this driver is:
>  1) initializes some registers of SoC specific to use the
>     {ehci,ohci}-platform driver.
> 
>  2) detects id pin to select host or peripheral on the channel 0.
> 
> For now, this driver only supports 1) above.
> 
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> ---
>  This patch is based on the latest linux-phy / next branch.
>  (commit id = cfd093bbb5fe84ec8c7bb069fe618159a8b601f5)
> 
>  Changes from v1:
>   - Revise some typos.
>   - Remove using clk API to enable/disable the clocks.
>     (In other words, this driver expects to enable/disable the clocks by
>      Runtime PM API by the phy-core driver.)
>   - Remove an unnecessary header file (asm/cmpxchg.h).
> 
>  .../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt |  35 +++
>  drivers/phy/Kconfig                                |   6 +
>  drivers/phy/Makefile                               |   1 +
>  drivers/phy/phy-rcar-gen3-usb2.c                   | 240 +++++++++++++++++++++
>  4 files changed, 282 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
>  create mode 100644 drivers/phy/phy-rcar-gen3-usb2.c
> 
> diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> new file mode 100644
> index 0000000..1d57766
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> @@ -0,0 +1,35 @@
> +* Renesas R-Car generation 3 USB 2.0 PHY
> +
> +This file provides information on what the device node for the R-Car generation
> +3 USB 2.0 PHY contains.
> +
> +Required properties:
> +- compatible: "renesas,usb2-phy-r8a7795" if the device is a part of an R8A7795
> +	      SoC.
> +- reg: offset and length of the USB2.0 host register block.
> +- reg-names: must be "usb2".
> +- clocks: clock phandle and specifier pair(s).
> +- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.
> +
> +Optional properties:
> +To use a USB channel where EHCI/OHCI and HSUSB are combined, the device tree
> +node should set HSUSB properties to reg and reg-names properties:
> +- reg: offset and length of the HSUSB register block.
> +- reg-names: must be "hsusb".
> +
> +Example (R-Car H3):
> +
> +	usb-phy@...80200 {
> +		compatible = "renesas,usb2-phy-r8a7795";
> +		reg = <0 0xee080200 0 0x6ff>, <0 0xe6590100 0 0x100>;
> +		reg-names = "usb2", "hsusb";

hsusb is missing in Documentation.
> +		clocks = <&mstp7_clks R8A7795_CLK_EHCI0>,
> +			 <&mstp7_clks R8A7795_CLK_HSUSB>;
> +	};
> +
> +	usb-phy@...a0200 {
> +		compatible = "renesas,usb2-phy-r8a7795";
> +		reg = <0 0xee0a0200 0 0x6ff>;
> +		reg-names = "usb2";
> +		clocks = <&mstp7_clks R8A7795_CLK_EHCI0>;
> +	};
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 0fe9bff..406dc43 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -116,6 +116,12 @@ config PHY_RCAR_GEN2
>  	help
>  	  Support for USB PHY found on Renesas R-Car generation 2 SoCs.
>  
> +config PHY_RCAR_GEN3_USB2
> +	tristate "Renesas R-Car generation 3 USB 2.0 PHY driver"
> +	depends on GENERIC_PHY

depends on OF?

Thanks
Kishon
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