Hi Shimoda-san,
On Thu, Aug 20, 2015 at 8:28 AM, Yoshihiro Shimoda
<yoshihiro.shimoda.uh@xxxxxxxxxxx> 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.
>
> 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.
Thanks for your patch!
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> @@ -0,0 +1,37 @@
> +* 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 R8A7795 SoC.
"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.
"pair(s)."
> +- clock-names: string, clock input name, must be "usb2", and optional "hsusb".
names
> +- #phy-cells: see phy-bindings.txt in the same directory, must be <0>.
> +
> +Optional proparies:
properties
> +To use a USB channel which EHCI/OHCI and HSUSB are combined, the device tree
s/which/where/
> +node should set HSUSB proparies to reg and reg-names proparies:
properties (x2)
> +- reg: offset and length of the HSUSB register block.
> +- reg-names: must be "hsusb".
> +
> +Example (R-Car H3):
> +
> + usb-phy@ee080200 {
> + compatible = "renesas,usb2-phy-r8a7795";
> + reg = <0 0xee080200 0 0x6ff>, <0 0xe6590100 0 0x100>;
> + reg-names = "usb2", "hsusb";
> + clocks = <&mstp7_clks R8A7795_CLK_EHCI0>,
> + <&mstp7_clks R8A7795_CLK_HSUSB>;
If you ever want to enable Runtime PM, do you want the first MSTP clock to be
managed automatically?
What about the second optional clock?
> + clock-names = "usb2", "hsusb";
> + };
> +
> + usb-phy@ee0a0200 {
> + compatible = "renesas,usb2-phy-r8a7795";
> + reg = <0 0xee0a0200 0 0x6ff>;
> + reg-names = "usb2";
> + clocks = <&mstp7_clks R8A7795_CLK_EHCI0>;
> + clock-names = "usb2";
> + };
> --- /dev/null
> +++ b/drivers/phy/phy-rcar-gen3-usb2.c
> +static int rcar_gen3_phy_usb2_init(struct phy *p)
> +{
> + struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
> + unsigned long flags;
> + void __iomem *usb2_base = channel->usb2.base;
> + void __iomem *hsusb_base = channel->hsusb.base;
> + u32 tmp;
> +
> + /* Since ops->init() is called once, this driver enables both clocks */
> + clk_prepare_enable(channel->usb2.clk);
> + clk_prepare_enable(channel->hsusb.clk);
So this driver manages its clock(s) itself, and doesn't support Runtime PM.
> +static int rcar_gen3_phy_usb2_exit(struct phy *p)
> +{
> + struct rcar_gen3_phy_usb2_channel *channel = phy_get_drvdata(p);
> +
> + writel(0, channel->usb2.base + USB2_INT_ENABLE);
> +
> + clk_disable_unprepare(channel->hsusb.clk);
> + clk_disable_unprepare(channel->usb2.clk);
> +
> + return 0;
> +}
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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