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phy: sun4i-usb: Add id_detect and vbus_detect ops

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ID and VBUS detection code require when musb changing
between Host and/or Peripheral modes.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Jun Nie <jun.nie@linaro.org>
This commit is contained in:
Jagan Teki 2018-05-07 13:03:27 +05:30
parent 6768594326
commit 129c45c728
2 changed files with 65 additions and 0 deletions
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39
drivers/phy/allwinner/phy-sun4i-usb.c
View file

@ -14,6 +14,7 @@
#include <dm.h>
#include <dm/device.h>
#include <generic-phy.h>
#include <phy-sun4i-usb.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
@ -295,6 +296,44 @@ static int sun4i_usb_phy_xlate(struct phy *phy,
return 0;
}
int sun4i_usb_phy_vbus_detect(struct phy *phy)
{
struct sun4i_usb_phy_data *data = dev_get_priv(phy->dev);
struct sun4i_usb_phy_plat *usb_phy = &data->usb_phy[phy->id];
int err, retries = 3;
debug("%s: id_det = %d\n", __func__, usb_phy->gpio_id_det);
if (usb_phy->gpio_vbus_det < 0)
return usb_phy->gpio_vbus_det;
err = gpio_get_value(usb_phy->gpio_vbus_det);
/*
* Vbus may have been provided by the board and just been turned of
* some milliseconds ago on reset, what we're measuring then is a
* residual charge on Vbus, sleep a bit and try again.
*/
while (err > 0 && retries--) {
mdelay(100);
err = gpio_get_value(usb_phy->gpio_vbus_det);
}
return err;
}
int sun4i_usb_phy_id_detect(struct phy *phy)
{
struct sun4i_usb_phy_data *data = dev_get_priv(phy->dev);
struct sun4i_usb_phy_plat *usb_phy = &data->usb_phy[phy->id];
debug("%s: id_det = %d\n", __func__, usb_phy->gpio_id_det);
if (usb_phy->gpio_id_det < 0)
return usb_phy->gpio_id_det;
return gpio_get_value(usb_phy->gpio_id_det);
}
static struct phy_ops sun4i_usb_phy_ops = {
.of_xlate = sun4i_usb_phy_xlate,
.init = sun4i_usb_phy_init,

26
include/phy-sun4i-usb.h Normal file
View file

@ -0,0 +1,26 @@
/*
* Copyright (C) 2017 Jagan Teki <jagan@amarulasolutions.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __GENERIC_PHY_SUN4I_USB_H
#define __GENERIC_PHY_SUN4I_USB_H
/**
* sun4i_usb_phy_id_detect - detect ID pin of USB PHY
*
* @phy: USB PHY port to detect ID pin
* @return 0 if OK, or a negative error code
*/
int sun4i_usb_phy_id_detect(struct phy *phy);
/**
* sun4i_usb_phy_vbus_detect - detect VBUS pin of USB PHY
*
* @phy: USB PHY port to detect VBUS pin
* @return 0 if OK, or a negative error code
*/
int sun4i_usb_phy_vbus_detect(struct phy *phy);
#endif /*__GENERIC_PHY_SUN4I_USB_H */