On Wed, 29 Jan 2014, Kamil Debski wrote:
> Change the phy provider used from the old one using the USB phy
> framework to a new one using the Generic phy framework.
>
> Signed-off-by: Kamil Debski <k.deb...@samsung.com>
> ---
> .../devicetree/bindings/usb/exynos-usb.txt | 13 +++
> drivers/usb/host/ehci-exynos.c | 97
> +++++++++++++-------
> 2 files changed, 76 insertions(+), 34 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/exynos-usb.txt
> b/Documentation/devicetree/bindings/usb/exynos-usb.txt
> index d967ba1..25e199a 100644
> --- a/Documentation/devicetree/bindings/usb/exynos-usb.txt
> +++ b/Documentation/devicetree/bindings/usb/exynos-usb.txt
> @@ -12,6 +12,10 @@ Required properties:
> - interrupts: interrupt number to the cpu.
> - clocks: from common clock binding: handle to usb clock.
> - clock-names: from common clock binding: Shall be "usbhost".
> + - port: if in the SoC there are EHCI phys, they should be listed here.
> +One phy per port. Each port should have its reg entry with a consecutive
> +number. Also it should contain phys and phy-names entries specifying the
> +phy used by the port.
What is the reg entry number used for? As far as I can see, it isn't
used for anything. In which case, why have it at all?
> @@ -42,10 +42,10 @@
> static const char hcd_name[] = "ehci-exynos";
> static struct hc_driver __read_mostly exynos_ehci_hc_driver;
>
> +#define PHY_NUMBER 3
> struct exynos_ehci_hcd {
> struct clk *clk;
> - struct usb_phy *phy;
> - struct usb_otg *otg;
You have removed all the OTG stuff from the driver. This wasn't
mentioned in the patch description, and it has no connection with the
PHY work.
> + struct phy *phy[PHY_NUMBER];
> };
>
> #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd
> *)(hcd_to_ehci(hcd)->priv)
> @@ -69,13 +69,43 @@ static void exynos_setup_vbus_gpio(struct platform_device
> *pdev)
> dev_err(dev, "can't request ehci vbus gpio %d", gpio);
> }
>
> +static int exynos_phys_on(struct phy *p[])
> +{
> + int i;
> + int ret = 0;
> +
> + for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
> + if (p[i])
> + ret = phy_power_on(p[i]);
> + if (ret)
> + for (i--; i > 0; i--)
> + if (p[i])
> + phy_power_off(p[i]);
This loop runs while i > 0. Therefore you will never turn off the
power to p[0].
> @@ -102,14 +132,26 @@ static int exynos_ehci_probe(struct platform_device
> *pdev)
> "samsung,exynos5440-ehci"))
> goto skip_phy;
>
> - phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
> - if (IS_ERR(phy)) {
> - usb_put_hcd(hcd);
You omitted this line from the new error returns below.
> - dev_warn(&pdev->dev, "no platform data or transceiver
> defined\n");
> - return -EPROBE_DEFER;
> - } else {
> - exynos_ehci->phy = phy;
> - exynos_ehci->otg = phy->otg;
> + for_each_available_child_of_node(pdev->dev.of_node, child) {
> + err = of_property_read_u32(child, "reg", &phy_number);
> + if (err) {
> + dev_err(&pdev->dev, "Failed to parse device tree\n");
> + of_node_put(child);
> + return err;
Here, for example. Wouldn't it be better to goto fail_clk?
Alan Stern
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