mirrors/u-boot
0
0
Fork 0
mirror of https://github.com/u-boot/u-boot.git synced 2024-11-23 20:24:26 +08:00
Code Issues Packages Projects Releases Wiki Activity

phy: Add driver for ST-Ericsson AB8500 USB PHY

Browse Source 
The AB8500 PMIC contains an USB PHY that needs to be set up in
device or host mode to make USB work properly. Add a simple driver
for the generic PHY uclass that allows enabling it.

The if (CONFIG_IS_ENABLED(USB_MUSB_HOST)) might be a bit strange.
The USB PHY must be configured in either host or device mode and
somehow the USB PHY driver must be made aware of the mode.

Actually, the MUSB driver used together with this PHY does not
support dynamic selection of host/device mode in U-Boot at the moment.
Therefore, one very simple approach that works fine is to select
the mode to configure at compile time. When the MUSB driver is
configured in host mode the PHY is configured in host mode, and
similarly when the MUSB driver is configured in device/gadget mode.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Stephan Gerhold 2021-07-08 20:33:49 +02:00 committed by Tom Rini
parent 3f6e4ec7c3
commit 4559df9e81
3 changed files with 59 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/phy/Kconfig
View File

@ -64,6 +64,12 @@ config MIPI_DPHY_HELPERS
help
Provides a number of helpers a core functions for MIPI D-PHY drivers.
config AB8500_USB_PHY
bool "AB8500 USB PHY Driver"
depends on PHY && PMIC_AB8500
help
Support for the USB OTG PHY in ST-Ericsson AB8500.
config BCM6318_USBH_PHY
bool "BCM6318 USBH PHY support"
depends on PHY && ARCH_BMIPS

1
drivers/phy/Makefile
View File

@ -6,6 +6,7 @@
obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o
obj-$(CONFIG_$(SPL_)NOP_PHY) += nop-phy.o
obj-$(CONFIG_MIPI_DPHY_HELPERS) += phy-core-mipi-dphy.o
obj-$(CONFIG_AB8500_USB_PHY) += phy-ab8500-usb.o
obj-$(CONFIG_BCM6318_USBH_PHY) += bcm6318-usbh-phy.o
obj-$(CONFIG_BCM6348_USBH_PHY) += bcm6348-usbh-phy.o
obj-$(CONFIG_BCM6358_USBH_PHY) += bcm6358-usbh-phy.o

52
drivers/phy/phy-ab8500-usb.c Normal file
View File

@ -0,0 +1,52 @@
// SPDX-License-Identifier: GPL-2.0+
/* Copyright (C) 2019 Stephan Gerhold */
#include <common.h>
#include <dm.h>
#include <generic-phy.h>
#include <linux/bitops.h>
#include <power/pmic.h>
#include <power/ab8500.h>
#define AB8500_USB_PHY_CTRL_REG AB8500_USB(0x8A)
#define AB8500_BIT_PHY_CTRL_HOST_EN BIT(0)
#define AB8500_BIT_PHY_CTRL_DEVICE_EN BIT(1)
#define AB8500_USB_PHY_CTRL_MASK (AB8500_BIT_PHY_CTRL_HOST_EN |\
AB8500_BIT_PHY_CTRL_DEVICE_EN)
static int ab8500_usb_phy_power_on(struct phy *phy)
{
struct udevice *dev = phy->dev;
uint set = AB8500_BIT_PHY_CTRL_DEVICE_EN;
if (CONFIG_IS_ENABLED(USB_MUSB_HOST))
set = AB8500_BIT_PHY_CTRL_HOST_EN;
return pmic_clrsetbits(dev->parent, AB8500_USB_PHY_CTRL_REG,
AB8500_USB_PHY_CTRL_MASK, set);
}
static int ab8500_usb_phy_power_off(struct phy *phy)
{
struct udevice *dev = phy->dev;
return pmic_clrsetbits(dev->parent, AB8500_USB_PHY_CTRL_REG,
AB8500_USB_PHY_CTRL_MASK, 0);
}
struct phy_ops ab8500_usb_phy_ops = {
.power_on = ab8500_usb_phy_power_on,
.power_off = ab8500_usb_phy_power_off,
};
static const struct udevice_id ab8500_usb_phy_ids[] = {
{ .compatible = "stericsson,ab8500-usb" },
{ }
};
U_BOOT_DRIVER(ab8500_usb_phy) = {
.name = "ab8500_usb_phy",
.id = UCLASS_PHY,
.of_match = ab8500_usb_phy_ids,
.ops = &ab8500_usb_phy_ops,
};