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linux/drivers/regulator/mc13892-regulator.c
Douglas Anderson 259b93b21a
regulator: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in 4.14 
Probing of regulators can be a slow operation and can contribute to
slower boot times. This is especially true if a regulator is turned on
at probe time (with regulator-boot-on or regulator-always-on) and the
regulator requires delays (off-on-time, ramp time, etc).

While the overall kernel is not ready to switch to async probe by
default, as per the discussion on the mailing lists [1] it is believed
that the regulator subsystem is in good shape and we can move
regulator drivers over wholesale. There is no way to just magically
opt in all regulators (regulators are just normal drivers like
platform_driver), so we set PROBE_PREFER_ASYNCHRONOUS for all
regulators found in 'drivers/regulator' individually.

Given the number of drivers touched and the impossibility to test this
ahead of time, it wouldn't be shocking at all if this caused a
regression for someone. If there is a regression caused by this patch,
it's likely to be one of the cases talked about in [1]. As a "quick
fix", drivers involved in the regression could be fixed by changing
them to PROBE_FORCE_SYNCHRONOUS. That being said, the correct fix
would be to directly fix the problem that caused the issue with async
probe.

The approach here follows a similar approach that was used for the mmc
subsystem several years ago [2]. In fact, I ran nearly the same python
script to auto-generate the changes. The only thing I changed was to
search for "i2c_driver", "spmi_driver", and "spi_driver" in addition
to "platform_driver".

[1] https://lore.kernel.org/r/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk
[2] https://lore.kernel.org/r/20200903232441.2694866-1-dianders@chromium.org/

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230316125351.1.I2a4677392a38db5758dee0788b2cea5872562a82@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-03-20 13:11:25 +00:00

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// SPDX-License-Identifier: GPL-2.0
//
// Regulator Driver for Freescale MC13892 PMIC
//
// Copyright 2010 Yong Shen <yong.shen@linaro.org>
//
// Based on draft driver from Arnaud Patard <arnaud.patard@rtp-net.org>
#include <linux/mfd/mc13892.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include "mc13xxx.h"
#define MC13892_REVISION 7
#define MC13892_POWERCTL0 13
#define MC13892_POWERCTL0_USEROFFSPI 3
#define MC13892_POWERCTL0_VCOINCELLVSEL 20
#define MC13892_POWERCTL0_VCOINCELLVSEL_M (7<<20)
#define MC13892_POWERCTL0_VCOINCELLEN (1<<23)
#define MC13892_SWITCHERS0_SWxHI (1<<23)
#define MC13892_SWITCHERS0 24
#define MC13892_SWITCHERS0_SW1VSEL 0
#define MC13892_SWITCHERS0_SW1VSEL_M (0x1f<<0)
#define MC13892_SWITCHERS0_SW1HI (1<<23)
#define MC13892_SWITCHERS0_SW1EN 0
#define MC13892_SWITCHERS1 25
#define MC13892_SWITCHERS1_SW2VSEL 0
#define MC13892_SWITCHERS1_SW2VSEL_M (0x1f<<0)
#define MC13892_SWITCHERS1_SW2HI (1<<23)
#define MC13892_SWITCHERS1_SW2EN 0
#define MC13892_SWITCHERS2 26
#define MC13892_SWITCHERS2_SW3VSEL 0
#define MC13892_SWITCHERS2_SW3VSEL_M (0x1f<<0)
#define MC13892_SWITCHERS2_SW3HI (1<<23)
#define MC13892_SWITCHERS2_SW3EN 0
#define MC13892_SWITCHERS3 27
#define MC13892_SWITCHERS3_SW4VSEL 0
#define MC13892_SWITCHERS3_SW4VSEL_M (0x1f<<0)
#define MC13892_SWITCHERS3_SW4HI (1<<23)
#define MC13892_SWITCHERS3_SW4EN 0
#define MC13892_SWITCHERS4 28
#define MC13892_SWITCHERS4_SW1MODE 0
#define MC13892_SWITCHERS4_SW1MODE_AUTO (8<<0)
#define MC13892_SWITCHERS4_SW1MODE_M (0xf<<0)
#define MC13892_SWITCHERS4_SW2MODE 10
#define MC13892_SWITCHERS4_SW2MODE_AUTO (8<<10)
#define MC13892_SWITCHERS4_SW2MODE_M (0xf<<10)
#define MC13892_SWITCHERS5 29
#define MC13892_SWITCHERS5_SW3MODE 0
#define MC13892_SWITCHERS5_SW3MODE_AUTO (8<<0)
#define MC13892_SWITCHERS5_SW3MODE_M (0xf<<0)
#define MC13892_SWITCHERS5_SW4MODE 8
#define MC13892_SWITCHERS5_SW4MODE_AUTO (8<<8)
#define MC13892_SWITCHERS5_SW4MODE_M (0xf<<8)
#define MC13892_SWITCHERS5_SWBSTEN (1<<20)
#define MC13892_REGULATORSETTING0 30
#define MC13892_REGULATORSETTING0_VGEN1VSEL 0
#define MC13892_REGULATORSETTING0_VDIGVSEL 4
#define MC13892_REGULATORSETTING0_VGEN2VSEL 6
#define MC13892_REGULATORSETTING0_VPLLVSEL 9
#define MC13892_REGULATORSETTING0_VUSB2VSEL 11
#define MC13892_REGULATORSETTING0_VGEN3VSEL 14
#define MC13892_REGULATORSETTING0_VCAMVSEL 16
#define MC13892_REGULATORSETTING0_VGEN1VSEL_M (3<<0)
#define MC13892_REGULATORSETTING0_VDIGVSEL_M (3<<4)
#define MC13892_REGULATORSETTING0_VGEN2VSEL_M (7<<6)
#define MC13892_REGULATORSETTING0_VPLLVSEL_M (3<<9)
#define MC13892_REGULATORSETTING0_VUSB2VSEL_M (3<<11)
#define MC13892_REGULATORSETTING0_VGEN3VSEL_M (1<<14)
#define MC13892_REGULATORSETTING0_VCAMVSEL_M (3<<16)
#define MC13892_REGULATORSETTING1 31
#define MC13892_REGULATORSETTING1_VVIDEOVSEL 2
#define MC13892_REGULATORSETTING1_VAUDIOVSEL 4
#define MC13892_REGULATORSETTING1_VSDVSEL 6
#define MC13892_REGULATORSETTING1_VVIDEOVSEL_M (3<<2)
#define MC13892_REGULATORSETTING1_VAUDIOVSEL_M (3<<4)
#define MC13892_REGULATORSETTING1_VSDVSEL_M (7<<6)
#define MC13892_REGULATORMODE0 32
#define MC13892_REGULATORMODE0_VGEN1EN (1<<0)
#define MC13892_REGULATORMODE0_VGEN1STDBY (1<<1)
#define MC13892_REGULATORMODE0_VGEN1MODE (1<<2)
#define MC13892_REGULATORMODE0_VIOHIEN (1<<3)
#define MC13892_REGULATORMODE0_VIOHISTDBY (1<<4)
#define MC13892_REGULATORMODE0_VIOHIMODE (1<<5)
#define MC13892_REGULATORMODE0_VDIGEN (1<<9)
#define MC13892_REGULATORMODE0_VDIGSTDBY (1<<10)
#define MC13892_REGULATORMODE0_VDIGMODE (1<<11)
#define MC13892_REGULATORMODE0_VGEN2EN (1<<12)
#define MC13892_REGULATORMODE0_VGEN2STDBY (1<<13)
#define MC13892_REGULATORMODE0_VGEN2MODE (1<<14)
#define MC13892_REGULATORMODE0_VPLLEN (1<<15)
#define MC13892_REGULATORMODE0_VPLLSTDBY (1<<16)
#define MC13892_REGULATORMODE0_VPLLMODE (1<<17)
#define MC13892_REGULATORMODE0_VUSB2EN (1<<18)
#define MC13892_REGULATORMODE0_VUSB2STDBY (1<<19)
#define MC13892_REGULATORMODE0_VUSB2MODE (1<<20)
#define MC13892_REGULATORMODE1 33
#define MC13892_REGULATORMODE1_VGEN3EN (1<<0)
#define MC13892_REGULATORMODE1_VGEN3STDBY (1<<1)
#define MC13892_REGULATORMODE1_VGEN3MODE (1<<2)
#define MC13892_REGULATORMODE1_VCAMEN (1<<6)
#define MC13892_REGULATORMODE1_VCAMSTDBY (1<<7)
#define MC13892_REGULATORMODE1_VCAMMODE (1<<8)
#define MC13892_REGULATORMODE1_VCAMCONFIGEN (1<<9)
#define MC13892_REGULATORMODE1_VVIDEOEN (1<<12)
#define MC13892_REGULATORMODE1_VVIDEOSTDBY (1<<13)
#define MC13892_REGULATORMODE1_VVIDEOMODE (1<<14)
#define MC13892_REGULATORMODE1_VAUDIOEN (1<<15)
#define MC13892_REGULATORMODE1_VAUDIOSTDBY (1<<16)
#define MC13892_REGULATORMODE1_VAUDIOMODE (1<<17)
#define MC13892_REGULATORMODE1_VSDEN (1<<18)
#define MC13892_REGULATORMODE1_VSDSTDBY (1<<19)
#define MC13892_REGULATORMODE1_VSDMODE (1<<20)
#define MC13892_POWERMISC 34
#define MC13892_POWERMISC_GPO1EN (1<<6)
#define MC13892_POWERMISC_GPO2EN (1<<8)
#define MC13892_POWERMISC_GPO3EN (1<<10)
#define MC13892_POWERMISC_GPO4EN (1<<12)
#define MC13892_POWERMISC_PWGT1SPIEN (1<<15)
#define MC13892_POWERMISC_PWGT2SPIEN (1<<16)
#define MC13892_POWERMISC_GPO4ADINEN (1<<21)
#define MC13892_POWERMISC_PWGTSPI_M (3 << 15)
#define MC13892_USB1 50
#define MC13892_USB1_VUSBEN (1<<3)
static const unsigned int mc13892_vcoincell[] = {
2500000, 2700000, 2800000, 2900000, 3000000, 3100000,
3200000, 3300000,
};
static const unsigned int mc13892_sw1[] = {
600000, 625000, 650000, 675000, 700000, 725000,
750000, 775000, 800000, 825000, 850000, 875000,
900000, 925000, 950000, 975000, 1000000, 1025000,
1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
1350000, 1375000
};
/*
* Note: this table is used to derive SWxVSEL by index into
* the array. Offset the values by the index of 1100000uV
* to get the actual register value for that voltage selector
* if the HI bit is to be set as well.
*/
#define MC13892_SWxHI_SEL_OFFSET 20
static const unsigned int mc13892_sw[] = {
600000, 625000, 650000, 675000, 700000, 725000,
750000, 775000, 800000, 825000, 850000, 875000,
900000, 925000, 950000, 975000, 1000000, 1025000,
1050000, 1075000, 1100000, 1125000, 1150000, 1175000,
1200000, 1225000, 1250000, 1275000, 1300000, 1325000,
1350000, 1375000, 1400000, 1425000, 1450000, 1475000,
1500000, 1525000, 1550000, 1575000, 1600000, 1625000,
1650000, 1675000, 1700000, 1725000, 1750000, 1775000,
1800000, 1825000, 1850000, 1875000
};
static const unsigned int mc13892_swbst[] = {
5000000,
};
static const unsigned int mc13892_viohi[] = {
2775000,
};
static const unsigned int mc13892_vpll[] = {
1050000, 1250000, 1650000, 1800000,
};
static const unsigned int mc13892_vdig[] = {
1050000, 1250000, 1650000, 1800000,
};
static const unsigned int mc13892_vsd[] = {
1800000, 2000000, 2600000, 2700000,
2800000, 2900000, 3000000, 3150000,
};
static const unsigned int mc13892_vusb2[] = {
2400000, 2600000, 2700000, 2775000,
};
static const unsigned int mc13892_vvideo[] = {
2700000, 2775000, 2500000, 2600000,
};
static const unsigned int mc13892_vaudio[] = {
2300000, 2500000, 2775000, 3000000,
};
static const unsigned int mc13892_vcam[] = {
2500000, 2600000, 2750000, 3000000,
};
static const unsigned int mc13892_vgen1[] = {
1200000, 1500000, 2775000, 3150000,
};
static const unsigned int mc13892_vgen2[] = {
1200000, 1500000, 1600000, 1800000,
2700000, 2800000, 3000000, 3150000,
};
static const unsigned int mc13892_vgen3[] = {
1800000, 2900000,
};
static const unsigned int mc13892_vusb[] = {
3300000,
};
static const unsigned int mc13892_gpo[] = {
2750000,
};
static const unsigned int mc13892_pwgtdrv[] = {
5000000,
};
static const struct regulator_ops mc13892_gpo_regulator_ops;
static const struct regulator_ops mc13892_sw_regulator_ops;
#define MC13892_FIXED_DEFINE(name, node, reg, voltages) \
MC13xxx_FIXED_DEFINE(MC13892_, name, node, reg, voltages, \
mc13xxx_fixed_regulator_ops)
#define MC13892_GPO_DEFINE(name, node, reg, voltages) \
MC13xxx_GPO_DEFINE(MC13892_, name, node, reg, voltages, \
mc13892_gpo_regulator_ops)
#define MC13892_SW_DEFINE(name, node, reg, vsel_reg, voltages) \
MC13xxx_DEFINE(MC13892_, name, node, reg, vsel_reg, voltages, \
mc13892_sw_regulator_ops)
#define MC13892_DEFINE_REGU(name, node, reg, vsel_reg, voltages) \
MC13xxx_DEFINE(MC13892_, name, node, reg, vsel_reg, voltages, \
mc13xxx_regulator_ops)
static struct mc13xxx_regulator mc13892_regulators[] = {
MC13892_DEFINE_REGU(VCOINCELL, vcoincell, POWERCTL0, POWERCTL0, mc13892_vcoincell),
MC13892_SW_DEFINE(SW1, sw1, SWITCHERS0, SWITCHERS0, mc13892_sw1),
MC13892_SW_DEFINE(SW2, sw2, SWITCHERS1, SWITCHERS1, mc13892_sw),
MC13892_SW_DEFINE(SW3, sw3, SWITCHERS2, SWITCHERS2, mc13892_sw),
MC13892_SW_DEFINE(SW4, sw4, SWITCHERS3, SWITCHERS3, mc13892_sw),
MC13892_FIXED_DEFINE(SWBST, swbst, SWITCHERS5, mc13892_swbst),
MC13892_FIXED_DEFINE(VIOHI, viohi, REGULATORMODE0, mc13892_viohi),
MC13892_DEFINE_REGU(VPLL, vpll, REGULATORMODE0, REGULATORSETTING0,
mc13892_vpll),
MC13892_DEFINE_REGU(VDIG, vdig, REGULATORMODE0, REGULATORSETTING0,
mc13892_vdig),
MC13892_DEFINE_REGU(VSD, vsd, REGULATORMODE1, REGULATORSETTING1,
mc13892_vsd),
MC13892_DEFINE_REGU(VUSB2, vusb2, REGULATORMODE0, REGULATORSETTING0,
mc13892_vusb2),
MC13892_DEFINE_REGU(VVIDEO, vvideo, REGULATORMODE1, REGULATORSETTING1,
mc13892_vvideo),
MC13892_DEFINE_REGU(VAUDIO, vaudio, REGULATORMODE1, REGULATORSETTING1,
mc13892_vaudio),
MC13892_DEFINE_REGU(VCAM, vcam, REGULATORMODE1, REGULATORSETTING0,
mc13892_vcam),
MC13892_DEFINE_REGU(VGEN1, vgen1, REGULATORMODE0, REGULATORSETTING0,
mc13892_vgen1),
MC13892_DEFINE_REGU(VGEN2, vgen2, REGULATORMODE0, REGULATORSETTING0,
mc13892_vgen2),
MC13892_DEFINE_REGU(VGEN3, vgen3, REGULATORMODE1, REGULATORSETTING0,
mc13892_vgen3),
MC13892_FIXED_DEFINE(VUSB, vusb, USB1, mc13892_vusb),
MC13892_GPO_DEFINE(GPO1, gpo1, POWERMISC, mc13892_gpo),
MC13892_GPO_DEFINE(GPO2, gpo2, POWERMISC, mc13892_gpo),
MC13892_GPO_DEFINE(GPO3, gpo3, POWERMISC, mc13892_gpo),
MC13892_GPO_DEFINE(GPO4, gpo4, POWERMISC, mc13892_gpo),
MC13892_GPO_DEFINE(PWGT1SPI, pwgt1spi, POWERMISC, mc13892_pwgtdrv),
MC13892_GPO_DEFINE(PWGT2SPI, pwgt2spi, POWERMISC, mc13892_pwgtdrv),
};
static int mc13892_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
u32 val)
{
struct mc13xxx *mc13892 = priv->mc13xxx;
int ret;
u32 valread;
BUG_ON(val & ~mask);
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_read(mc13892, MC13892_POWERMISC, &valread);
if (ret)
goto out;
/* Update the stored state for Power Gates. */
priv->powermisc_pwgt_state =
(priv->powermisc_pwgt_state & ~mask) | val;
priv->powermisc_pwgt_state &= MC13892_POWERMISC_PWGTSPI_M;
/* Construct the new register value */
valread = (valread & ~mask) | val;
/* Overwrite the PWGTxEN with the stored version */
valread = (valread & ~MC13892_POWERMISC_PWGTSPI_M) |
priv->powermisc_pwgt_state;
ret = mc13xxx_reg_write(mc13892, MC13892_POWERMISC, valread);
out:
mc13xxx_unlock(priv->mc13xxx);
return ret;
}
static int mc13892_gpo_regulator_enable(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
u32 en_val = mc13892_regulators[id].enable_bit;
u32 mask = mc13892_regulators[id].enable_bit;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
/* Power Gate enable value is 0 */
if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
en_val = 0;
if (id == MC13892_GPO4)
mask |= MC13892_POWERMISC_GPO4ADINEN;
return mc13892_powermisc_rmw(priv, mask, en_val);
}
static int mc13892_gpo_regulator_disable(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
u32 dis_val = 0;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
/* Power Gate disable value is 1 */
if (id == MC13892_PWGT1SPI || id == MC13892_PWGT2SPI)
dis_val = mc13892_regulators[id].enable_bit;
return mc13892_powermisc_rmw(priv, mc13892_regulators[id].enable_bit,
dis_val);
}
static int mc13892_gpo_regulator_is_enabled(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
unsigned int val;
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
mc13xxx_unlock(priv->mc13xxx);
if (ret)
return ret;
/* Power Gates state is stored in powermisc_pwgt_state
* where the meaning of bits is negated */
val = (val & ~MC13892_POWERMISC_PWGTSPI_M) |
(priv->powermisc_pwgt_state ^ MC13892_POWERMISC_PWGTSPI_M);
return (val & mc13892_regulators[id].enable_bit) != 0;
}
static const struct regulator_ops mc13892_gpo_regulator_ops = {
.enable = mc13892_gpo_regulator_enable,
.disable = mc13892_gpo_regulator_disable,
.is_enabled = mc13892_gpo_regulator_is_enabled,
.list_voltage = regulator_list_voltage_table,
.set_voltage = mc13xxx_fixed_regulator_set_voltage,
};
static int mc13892_sw_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
unsigned int val, selector;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_read(priv->mc13xxx,
mc13892_regulators[id].vsel_reg, &val);
mc13xxx_unlock(priv->mc13xxx);
if (ret)
return ret;
/*
* Figure out if the HI bit is set inside the switcher mode register
* since this means the selector value we return is at a different
* offset into the selector table.
*
* According to the MC13892 documentation note 59 (Table 47) the SW1
* buck switcher does not support output range programming therefore
* the HI bit must always remain 0. So do not do anything strange if
* our register is MC13892_SWITCHERS0.
*/
selector = val & mc13892_regulators[id].vsel_mask;
if ((mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) &&
(val & MC13892_SWITCHERS0_SWxHI)) {
selector += MC13892_SWxHI_SEL_OFFSET;
}
dev_dbg(rdev_get_dev(rdev), "%s id: %d val: 0x%08x selector: %d\n",
__func__, id, val, selector);
return selector;
}
static int mc13892_sw_regulator_set_voltage_sel(struct regulator_dev *rdev,
unsigned selector)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int volt, mask, id = rdev_get_id(rdev);
u32 reg_value;
int ret;
volt = rdev->desc->volt_table[selector];
mask = mc13892_regulators[id].vsel_mask;
reg_value = selector;
/*
* Don't mess with the HI bit or support HI voltage offsets for SW1.
*
* Since the get_voltage_sel callback has given a fudged value for
* the selector offset, we need to back out that offset if HI is
* to be set so we write the correct value to the register.
*
* The HI bit addition and selector offset handling COULD be more
* complicated by shifting and masking off the voltage selector part
* of the register then logical OR it back in, but since the selector
* is at bits 4:0 there is very little point. This makes the whole
* thing more readable and we do far less work.
*/
if (mc13892_regulators[id].vsel_reg != MC13892_SWITCHERS0) {
mask |= MC13892_SWITCHERS0_SWxHI;
if (volt > 1375000) {
reg_value -= MC13892_SWxHI_SEL_OFFSET;
reg_value |= MC13892_SWITCHERS0_SWxHI;
} else {
reg_value &= ~MC13892_SWITCHERS0_SWxHI;
}
}
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].vsel_reg,
mask, reg_value);
mc13xxx_unlock(priv->mc13xxx);
return ret;
}
static const struct regulator_ops mc13892_sw_regulator_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.set_voltage_sel = mc13892_sw_regulator_set_voltage_sel,
.get_voltage_sel = mc13892_sw_regulator_get_voltage_sel,
};
static int mc13892_vcam_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
unsigned int en_val = 0;
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
if (mode == REGULATOR_MODE_FAST)
en_val = MC13892_REGULATORMODE1_VCAMCONFIGEN;
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13892_regulators[id].reg,
MC13892_REGULATORMODE1_VCAMCONFIGEN, en_val);
mc13xxx_unlock(priv->mc13xxx);
return ret;
}
static unsigned int mc13892_vcam_get_mode(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
int ret, id = rdev_get_id(rdev);
unsigned int val;
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_read(priv->mc13xxx, mc13892_regulators[id].reg, &val);
mc13xxx_unlock(priv->mc13xxx);
if (ret)
return ret;
if (val & MC13892_REGULATORMODE1_VCAMCONFIGEN)
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static struct regulator_ops mc13892_vcam_ops;
static int mc13892_regulator_probe(struct platform_device *pdev)
{
struct mc13xxx_regulator_priv *priv;
struct mc13xxx *mc13892 = dev_get_drvdata(pdev->dev.parent);
struct mc13xxx_regulator_platform_data *pdata =
dev_get_platdata(&pdev->dev);
struct mc13xxx_regulator_init_data *mc13xxx_data;
struct regulator_config config = { };
int i, ret;
int num_regulators = 0;
u32 val;
num_regulators = mc13xxx_get_num_regulators_dt(pdev);
if (num_regulators <= 0 && pdata)
num_regulators = pdata->num_regulators;
if (num_regulators <= 0)
return -EINVAL;
priv = devm_kzalloc(&pdev->dev,
struct_size(priv, regulators, num_regulators),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->num_regulators = num_regulators;
priv->mc13xxx_regulators = mc13892_regulators;
priv->mc13xxx = mc13892;
platform_set_drvdata(pdev, priv);
mc13xxx_lock(mc13892);
ret = mc13xxx_reg_read(mc13892, MC13892_REVISION, &val);
if (ret)
goto err_unlock;
/* enable switch auto mode (on 2.0A silicon only) */
if ((val & 0x0000FFFF) == 0x45d0) {
ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS4,
MC13892_SWITCHERS4_SW1MODE_M |
MC13892_SWITCHERS4_SW2MODE_M,
MC13892_SWITCHERS4_SW1MODE_AUTO |
MC13892_SWITCHERS4_SW2MODE_AUTO);
if (ret)
goto err_unlock;
ret = mc13xxx_reg_rmw(mc13892, MC13892_SWITCHERS5,
MC13892_SWITCHERS5_SW3MODE_M |
MC13892_SWITCHERS5_SW4MODE_M,
MC13892_SWITCHERS5_SW3MODE_AUTO |
MC13892_SWITCHERS5_SW4MODE_AUTO);
if (ret)
goto err_unlock;
}
mc13xxx_unlock(mc13892);
/* update mc13892_vcam ops */
memcpy(&mc13892_vcam_ops, mc13892_regulators[MC13892_VCAM].desc.ops,
sizeof(struct regulator_ops));
mc13892_vcam_ops.set_mode = mc13892_vcam_set_mode;
mc13892_vcam_ops.get_mode = mc13892_vcam_get_mode;
mc13892_regulators[MC13892_VCAM].desc.ops = &mc13892_vcam_ops;
mc13xxx_data = mc13xxx_parse_regulators_dt(pdev, mc13892_regulators,
ARRAY_SIZE(mc13892_regulators));
for (i = 0; i < priv->num_regulators; i++) {
struct regulator_init_data *init_data;
struct regulator_desc *desc;
struct device_node *node = NULL;
int id;
if (mc13xxx_data) {
id = mc13xxx_data[i].id;
init_data = mc13xxx_data[i].init_data;
node = mc13xxx_data[i].node;
} else {
id = pdata->regulators[i].id;
init_data = pdata->regulators[i].init_data;
}
desc = &mc13892_regulators[id].desc;
config.dev = &pdev->dev;
config.init_data = init_data;
config.driver_data = priv;
config.of_node = node;
priv->regulators[i] = devm_regulator_register(&pdev->dev, desc,
&config);
if (IS_ERR(priv->regulators[i])) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
mc13892_regulators[i].desc.name);
return PTR_ERR(priv->regulators[i]);
}
}
return 0;
err_unlock:
mc13xxx_unlock(mc13892);
return ret;
}
static struct platform_driver mc13892_regulator_driver = {
.driver = {
.name = "mc13892-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = mc13892_regulator_probe,
};
static int __init mc13892_regulator_init(void)
{
return platform_driver_register(&mc13892_regulator_driver);
}
subsys_initcall(mc13892_regulator_init);
static void __exit mc13892_regulator_exit(void)
{
platform_driver_unregister(&mc13892_regulator_driver);
}
module_exit(mc13892_regulator_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
MODULE_DESCRIPTION("Regulator Driver for Freescale MC13892 PMIC");
MODULE_ALIAS("platform:mc13892-regulator");
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