Hello. On 07-03-2014 9:46, Magnus Damm wrote:
Add support of the device tree probing for the Renesas R-Car generation 2 SoCs documenting the device tree binding as necessary.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
--- This patch is against the 'next' branch of Felipe Balbi's 'usb.git' repo.
Changes in version 2: - restored devm_clk_get() call and the error handling logic in the probe() method, removed clk_put() call in the remove() method.
Documentation/devicetree/bindings/usb/rcar-gen2-phy.txt | 29 +++++++++++ drivers/usb/phy/phy-rcar-gen2-usb.c | 42 ++++++++++++++-- 2 files changed, 68 insertions(+), 3 deletions(-)
Index: usb/Documentation/devicetree/bindings/usb/rcar-gen2-phy.txt =================================================================== --- /dev/null +++ usb/Documentation/devicetree/bindings/usb/rcar-gen2-phy.txt @@ -0,0 +1,29 @@ +* Renesas R-Car generation 2 USB PHY + +This file provides information on what the device node for the R-Car generation +2 USB PHY contains. + +Required properties: +- compatible: "renesas,usb-phy-r8a7790" if the device is a part of R8A7790 SoC. + "renesas,usb-phy-r8a7791" if the device is a part of R8A7791 SoC. +- reg: offset and length of the register block. +- clocks: clock phandle and specifier pair. +- clock-names: string, clock input name, must be "usbhs". + +Optional properties: +- renesas,channel0-pci: boolean, specify when USB channel 0 should be connected + to PCI EHCI/OHCI; otherwise, it will be connected to the + USBHS controller. +- renesas,channel2-pci: boolean, specify when USB channel 2 should be connected + to PCI EHCI/OHCI; otherwise, it will be connected to the + USBSS controller (xHCI).
Thanks for your efforts here, but this DT binding looks like a mix of software configuration and hardware description.
I disagree. I have already explained to Mark Rutland how selecting a particular controller for a particular USB port should depend on the kind of the USB connector used, i.e. the board hardware.
+Example (Lager board): + + usb-phy@e6590100 { + compatible = "renesas,usb-phy-r8a7790"; + reg = <0 0xe6590100 0 0x100>; + clocks = <&mstp7_clks R8A7790_CLK_HSUSB>; + clock-names = "usbhs"; + renesas,channel2-pci; + };
As an example, instead of relying on "renesas,channel0-pci" or "renesas,channel2-pci" to specify which hard coded software configuration you want please rework this to expose 3 separate channels and use DT to point each host controller to the right channel.
So you want to expose the channels as "virtual devices"? Or what do you want? Also, it seems almost impossible to represent some USB controllers in DT -- such as USBHS in particular.
That will give us the opportunity to perform any kind of run time selection and not be limited by software policy set by DT.
Sorry, but I don't see how using DT could help with run-time selection. Could you please explain?
So this is a NAK on my side. I expect better.
Thanks for your long awaited feedback.
Thanks,
/ magnus
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