usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state

It is much more intuitive if reset is treated as asserted when GPIO value
is set to 1. All NVIDIA Tegra device-trees are properly specifying active
state of the reset-GPIO since 2013, let's clean up that part of the code.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-14-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Osipenko 2020-01-06 04:34:09 +03:00 committed by Greg Kroah-Hartman
parent 01d6ea31db
commit 06e60e5038
2 changed files with 18 additions and 55 deletions

View File

@ -693,12 +693,7 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
u32 val;
int err;
err = gpio_direction_output(phy->reset_gpio, 0);
if (err) {
dev_err(phy->u_phy.dev, "GPIO %d not set to 0: %d\n",
phy->reset_gpio, err);
return err;
}
gpiod_set_value_cansleep(phy->reset_gpio, 1);
err = clk_prepare_enable(phy->clk);
if (err)
@ -706,12 +701,7 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
usleep_range(5000, 6000);
err = gpio_direction_output(phy->reset_gpio, 1);
if (err) {
dev_err(phy->u_phy.dev, "GPIO %d not set to 1: %d\n",
phy->reset_gpio, err);
goto disable_clk;
}
gpiod_set_value_cansleep(phy->reset_gpio, 0);
usleep_range(1000, 2000);
@ -773,16 +763,8 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
{
int err;
err = gpio_direction_output(phy->reset_gpio, 0);
if (err) {
dev_err(phy->u_phy.dev, "reset GPIO not asserted: %d\n", err);
return err;
}
gpiod_set_value_cansleep(phy->reset_gpio, 1);
usleep_range(5000, 6000);
clk_disable_unprepare(phy->clk);
return 0;
@ -857,21 +839,6 @@ static int tegra_usb_phy_set_suspend(struct usb_phy *u_phy, int suspend)
return tegra_usb_phy_power_on(phy);
}
static int ulpi_open(struct tegra_usb_phy *phy)
{
int err;
err = gpio_direction_output(phy->reset_gpio, 0);
if (err) {
dev_err(phy->u_phy.dev,
"ULPI reset GPIO %d direction not asserted: %d\n",
phy->reset_gpio, err);
return err;
}
return 0;
}
static int tegra_usb_phy_init(struct usb_phy *u_phy)
{
struct tegra_usb_phy *phy = to_tegra_usb_phy(u_phy);
@ -907,12 +874,11 @@ static int tegra_usb_phy_init(struct usb_phy *u_phy)
goto fail;
}
if (phy->is_ulpi_phy)
err = ulpi_open(phy);
else
if (!phy->is_ulpi_phy) {
err = utmip_pad_open(phy);
if (err)
goto fail;
if (err)
goto fail;
}
err = tegra_usb_phy_power_on(phy);
if (err)
@ -1101,6 +1067,7 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
struct tegra_usb_phy *tegra_phy;
enum usb_phy_interface phy_type;
struct reset_control *reset;
struct gpio_desc *gpiod;
struct resource *res;
struct usb_phy *phy;
int err;
@ -1178,15 +1145,6 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
case USBPHY_INTERFACE_MODE_ULPI:
tegra_phy->is_ulpi_phy = true;
tegra_phy->reset_gpio =
of_get_named_gpio(np, "nvidia,phy-reset-gpio", 0);
if (!gpio_is_valid(tegra_phy->reset_gpio)) {
dev_err(&pdev->dev,
"Invalid GPIO: %d\n", tegra_phy->reset_gpio);
return tegra_phy->reset_gpio;
}
tegra_phy->clk = devm_clk_get(&pdev->dev, "ulpi-link");
err = PTR_ERR_OR_ZERO(tegra_phy->clk);
if (err) {
@ -1195,13 +1153,17 @@ static int tegra_usb_phy_probe(struct platform_device *pdev)
return err;
}
err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
"ulpi_phy_reset_b");
gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
"nvidia,phy-reset-gpio",
0, GPIOD_OUT_HIGH,
"ulpi_phy_reset_b");
err = PTR_ERR_OR_ZERO(gpiod);
if (err) {
dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
tegra_phy->reset_gpio, err);
dev_err(&pdev->dev,
"Request failed for reset GPIO: %d\n", err);
return err;
}
tegra_phy->reset_gpio = gpiod;
phy = devm_otg_ulpi_create(&pdev->dev,
&ulpi_viewport_access_ops, 0);

View File

@ -17,6 +17,7 @@
#define __TEGRA_USB_PHY_H
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/reset.h>
#include <linux/usb/otg.h>
@ -76,7 +77,7 @@ struct tegra_usb_phy {
struct usb_phy u_phy;
bool is_legacy_phy;
bool is_ulpi_phy;
int reset_gpio;
struct gpio_desc *reset_gpio;
struct reset_control *pad_rst;
bool powered_on;
};