Re: [PATCH v4 1/2] phy-sun4i-usb: Add full support for usb0 phy / OTG

Kishon Vijay Abraham I
2015-06-11T09:42:24Z

Hi,

On Sunday 31 May 2015 09:40 PM, Hans de Goede wrote:
> The usb0 phy is connected to an OTG controller, and as such needs some special
> handling:
>
> 1) It allows explicit control over the pullups, enable these on phy_init and
> disable them on phy_exit.
>
> 2) It has bits to signal id and vbus detect to the musb-core, add support for
> for monitoring id and vbus detect gpio-s for use in dual role mode, and set
> these bits to the correct values for operating in host only mode when no
> gpios are specified in the devicetree.
>
> 3) When in dual role mode the musb sunxi glue needs to know if the a host or
> device cable is plugged in, so when in dual role mode register an extcon.
>
> While updating the devicetree binding documentation also add documentation
> for the sofar undocumented usage of regulators for vbus for all 3 phys.
>
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
> Changes in v2:
> -Removed the sunxi specific phy functions, instead the id / vbus gpio polling
> has been moved to the phy-sun4i-usb driver and their status is exported
> through extcon for the sunxi-musb glue
> Changes in v3:
> -No changes
> Changes in v4:
> -Do not call regulator_disable in an unbalanced manner when an external vbus
> is present
> ---
> .../devicetree/bindings/phy/sun4i-usb-phy.txt | 18 +-
> drivers/phy/Kconfig | 1 +
> drivers/phy/phy-sun4i-usb.c | 273 ++++++++++++++++++++-
> 3 files changed, 281 insertions(+), 11 deletions(-)
>
.
.
<snip>
.
.
> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> index 91c5be4..b45d707 100644
> --- a/drivers/phy/phy-sun4i-usb.c
> +++ b/drivers/phy/phy-sun4i-usb.c
> @@ -1,7 +1,7 @@

.
.
<snip>
.
.
> static struct phy *sun4i_usb_phy_xlate(struct device *dev,
> struct of_phandle_args *args)
> {
> @@ -240,13 +417,20 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
> struct phy_provider *phy_provider;
> bool dedicated_clocks;
> struct resource *res;
> - int i;
> + int i, ret;
>
> data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> if (!data)
> return -ENOMEM;
>
> mutex_init(&data->mutex);
> + INIT_DELAYED_WORK(&data->detect, sun4i_usb_phy0_id_vbus_det_scan);
> + data->extcon_cable_names[0] = extcon_cable_name[EXTCON_USB_HOST];
> + data->extcon_cable_names[1] = extcon_cable_name[EXTCON_USB];
> + data->extcon_cable_names[2] = NULL;
> + data->extcon.name = DRIVER_NAME;
> + data->extcon.supported_cable = data->extcon_cable_names;
> + data->extcon.dev.parent = dev;
>
> if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy"))
> data->num_phys = 2;
> @@ -269,6 +453,34 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
> if (IS_ERR(data->base))
> return PTR_ERR(data->base);
>
> + data->id_det_gpio = devm_gpiod_get(dev, "usb0_id_det", GPIOD_IN);
> + if (IS_ERR(data->id_det_gpio)) {
> + if (PTR_ERR(data->id_det_gpio) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + data->id_det_gpio = NULL;
> + }
> +
> + data->vbus_det_gpio = devm_gpiod_get(dev, "usb0_vbus_det", GPIOD_IN);
> + if (IS_ERR(data->vbus_det_gpio)) {
> + if (PTR_ERR(data->vbus_det_gpio) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + data->vbus_det_gpio = NULL;
> + }
> +
> + /* We either want both gpio pins or neither (when in host mode) */
> + if (!data->id_det_gpio != !data->vbus_det_gpio) {
> + dev_err(dev, "failed to get id or vbus detect pin\n");
> + return -ENODEV;
> + }
> +
> + if (data->id_det_gpio) {
> + ret = devm_extcon_dev_register(dev, &data->extcon);
> + if (ret) {
> + dev_err(dev, "failed to register extcon: %d\n", ret);
> + return ret;
> + }
> + }
> +
> for (i = 0; i < data->num_phys; i++) {
> struct sun4i_usb_phy *phy = data->phys + i;
> char name[16];
> @@ -318,12 +530,54 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
> phy_set_drvdata(phy->phy, &data->phys[i]);
> }
>
> + data->id_det_irq = gpiod_to_irq(data->id_det_gpio);
> + data->vbus_det_irq = gpiod_to_irq(data->vbus_det_gpio);
> + if (data->id_det_irq < 0 || data->vbus_det_irq < 0)
> + data->phy0_poll = true;

if polling is enabled, we shouldn't enable irq at all?
> +
> + if (data->id_det_irq >= 0) {
> + ret = devm_request_irq(dev, data->id_det_irq,
> + sun4i_usb_phy0_id_vbus_det_irq,
> + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
> + "usb0-id-det", data);
> + if (ret) {
> + dev_err(dev, "Err requesting id-det-irq: %d\n", ret);
> + return ret;
> + }
> + }
> +
> + if (data->vbus_det_irq >= 0) {
> + ret = devm_request_irq(dev, data->vbus_det_irq,
> + sun4i_usb_phy0_id_vbus_det_irq,
> + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
> + "usb0-vbus-det", data);
> + if (ret) {
> + dev_err(dev, "Err requesting vbus-det-irq: %d\n", ret);
> + return ret;
> + }
> + }
> +
> dev_set_drvdata(dev, data);
> phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
>
> return PTR_ERR_OR_ZERO(phy_provider);
> }
>
> +static int sun4i_usb_phy_remove(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
> +
> + if (data->id_det_irq >= 0)
> + devm_free_irq(dev, data->id_det_irq, data);
> + if (data->vbus_det_irq >= 0)
> + devm_free_irq(dev, data->vbus_det_irq, data);

This shouldn't be needed since you already use devm_* in probe.

Thanks
Kishon

> +
> + cancel_delayed_work_sync(&data->detect);
> +
> + return 0;
> +}
> +
> static const struct of_device_id sun4i_usb_phy_of_match[] = {
> { .compatible = "allwinner,sun4i-a10-usb-phy" },
> { .compatible = "allwinner,sun5i-a13-usb-phy" },
> @@ -335,9 +589,10 @@ MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
>
> static struct platform_driver sun4i_usb_phy_driver = {
> .probe = sun4i_usb_phy_probe,
> + .remove = sun4i_usb_phy_remove,
> .driver = {
> .of_match_table = sun4i_usb_phy_of_match,
> - .name = "sun4i-usb-phy",
> + .name = DRIVER_NAME,
> }
> };
> module_platform_driver(sun4i_usb_phy_driver);
>