mirror of
https://xff.cz/git/u-boot/
synced 2025-10-31 10:26:10 +01:00
2a4747d3cd
get_enable should be able to return error values. Hence change the return type to integer. Signed-off-by: Keerthy <j-keerthy@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org>
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <power/pmic.h>
|
|
#include <power/regulator.h>
|
|
#include <power/tps65090.h>
|
|
|
|
static int tps65090_fet_probe(struct udevice *dev)
|
|
{
|
|
struct dm_regulator_uclass_platdata *uc_pdata;
|
|
|
|
uc_pdata = dev_get_uclass_platdata(dev);
|
|
|
|
uc_pdata->type = REGULATOR_TYPE_OTHER;
|
|
uc_pdata->mode_count = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps65090_fet_get_enable(struct udevice *dev)
|
|
{
|
|
struct udevice *pmic = dev_get_parent(dev);
|
|
int ret, fet_id;
|
|
|
|
fet_id = dev->driver_data;
|
|
debug("%s: fet_id=%d\n", __func__, fet_id);
|
|
|
|
ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ret & FET_CTRL_ENFET;
|
|
}
|
|
|
|
/**
|
|
* Set the power state for a FET
|
|
*
|
|
* @param pmic pmic structure for the tps65090
|
|
* @param fet_id FET number to set (1..MAX_FET_NUM)
|
|
* @param set 1 to power on FET, 0 to power off
|
|
* @return -EIO if we got a comms error, -EAGAIN if the FET failed to
|
|
* change state. If all is ok, returns 0.
|
|
*/
|
|
static int tps65090_fet_set(struct udevice *pmic, int fet_id, bool set)
|
|
{
|
|
int retry;
|
|
u32 value;
|
|
int ret;
|
|
|
|
value = FET_CTRL_ADENFET | FET_CTRL_WAIT;
|
|
if (set)
|
|
value |= FET_CTRL_ENFET;
|
|
|
|
if (pmic_reg_write(pmic, REG_FET_BASE + fet_id, value))
|
|
return -EIO;
|
|
|
|
/* Try reading until we get a result */
|
|
for (retry = 0; retry < MAX_CTRL_READ_TRIES; retry++) {
|
|
ret = pmic_reg_read(pmic, REG_FET_BASE + fet_id);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Check that the FET went into the expected state */
|
|
debug("%s: flags=%x\n", __func__, ret);
|
|
if (!!(ret & FET_CTRL_PGFET) == set)
|
|
return 0;
|
|
|
|
/* If we got a timeout, there is no point in waiting longer */
|
|
if (ret & FET_CTRL_TOFET)
|
|
break;
|
|
|
|
mdelay(1);
|
|
}
|
|
|
|
debug("FET %d: Power good should have set to %d but reg=%#02x\n",
|
|
fet_id, set, ret);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static int tps65090_fet_set_enable(struct udevice *dev, bool enable)
|
|
{
|
|
struct udevice *pmic = dev_get_parent(dev);
|
|
int ret, fet_id;
|
|
ulong start;
|
|
int loops;
|
|
|
|
fet_id = dev->driver_data;
|
|
debug("%s: fet_id=%d, enable=%d\n", __func__, fet_id, enable);
|
|
|
|
start = get_timer(0);
|
|
for (loops = 0;; loops++) {
|
|
ret = tps65090_fet_set(pmic, fet_id, enable);
|
|
if (!ret)
|
|
break;
|
|
|
|
if (get_timer(start) > 100)
|
|
break;
|
|
|
|
/* Turn it off and try again until we time out */
|
|
tps65090_fet_set(pmic, fet_id, false);
|
|
}
|
|
|
|
if (ret)
|
|
debug("%s: FET%d failed to power on: time=%lums, loops=%d\n",
|
|
__func__, fet_id, get_timer(start), loops);
|
|
else if (loops)
|
|
debug("%s: FET%d powered on after %lums, loops=%d\n",
|
|
__func__, fet_id, get_timer(start), loops);
|
|
|
|
/*
|
|
* Unfortunately there are some conditions where the power-good bit
|
|
* will be 0, but the FET still comes up. One such case occurs with
|
|
* the LCD backlight on snow. We'll just return 0 here and assume
|
|
* that the FET will eventually come up.
|
|
*/
|
|
if (ret == -EAGAIN)
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct dm_regulator_ops tps65090_fet_ops = {
|
|
.get_enable = tps65090_fet_get_enable,
|
|
.set_enable = tps65090_fet_set_enable,
|
|
};
|
|
|
|
U_BOOT_DRIVER(tps65090_fet) = {
|
|
.name = TPS65090_FET_DRIVER,
|
|
.id = UCLASS_REGULATOR,
|
|
.ops = &tps65090_fet_ops,
|
|
.probe = tps65090_fet_probe,
|
|
};
|