mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a7f1b63eb8
This commit adds device tree support for tps65217 pmic. And usage details are added to device tree documentation. Driver is tested by using kernel module with regulator set and get APIs. Signed-off-by: AnilKumar Ch <anilkumar@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
299 lines
7.5 KiB
C
299 lines
7.5 KiB
C
/*
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* tps65217.c
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*
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* TPS65217 chip family multi-function driver
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/regmap.h>
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#include <linux/err.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps65217.h>
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/**
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* tps65217_reg_read: Read a single tps65217 register.
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*
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* @tps: Device to read from.
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* @reg: Register to read.
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* @val: Contians the value
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*/
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int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
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unsigned int *val)
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{
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return regmap_read(tps->regmap, reg, val);
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}
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EXPORT_SYMBOL_GPL(tps65217_reg_read);
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/**
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* tps65217_reg_write: Write a single tps65217 register.
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*
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* @tps65217: Device to write to.
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* @reg: Register to write to.
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* @val: Value to write.
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* @level: Password protected level
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*/
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int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
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unsigned int val, unsigned int level)
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{
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int ret;
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unsigned int xor_reg_val;
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switch (level) {
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case TPS65217_PROTECT_NONE:
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return regmap_write(tps->regmap, reg, val);
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case TPS65217_PROTECT_L1:
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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return regmap_write(tps->regmap, reg, val);
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case TPS65217_PROTECT_L2:
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xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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ret = regmap_write(tps->regmap, reg, val);
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if (ret < 0)
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return ret;
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ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
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xor_reg_val);
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if (ret < 0)
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return ret;
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return regmap_write(tps->regmap, reg, val);
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default:
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL_GPL(tps65217_reg_write);
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/**
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* tps65217_update_bits: Modify bits w.r.t mask, val and level.
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*
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* @tps65217: Device to write to.
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* @reg: Register to read-write to.
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* @mask: Mask.
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* @val: Value to write.
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* @level: Password protected level
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*/
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static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
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unsigned int mask, unsigned int val, unsigned int level)
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{
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int ret;
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unsigned int data;
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ret = tps65217_reg_read(tps, reg, &data);
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if (ret) {
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dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
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return ret;
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}
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data &= ~mask;
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data |= val & mask;
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ret = tps65217_reg_write(tps, reg, data, level);
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if (ret)
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dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
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return ret;
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}
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int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
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unsigned int mask, unsigned int val, unsigned int level)
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{
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return tps65217_update_bits(tps, reg, mask, val, level);
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}
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EXPORT_SYMBOL_GPL(tps65217_set_bits);
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int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
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unsigned int mask, unsigned int level)
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{
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return tps65217_update_bits(tps, reg, mask, 0, level);
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}
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EXPORT_SYMBOL_GPL(tps65217_clear_bits);
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#ifdef CONFIG_OF
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static struct of_regulator_match reg_matches[] = {
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{ .name = "dcdc1", .driver_data = (void *)TPS65217_DCDC_1 },
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{ .name = "dcdc2", .driver_data = (void *)TPS65217_DCDC_2 },
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{ .name = "dcdc3", .driver_data = (void *)TPS65217_DCDC_3 },
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{ .name = "ldo1", .driver_data = (void *)TPS65217_LDO_1 },
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{ .name = "ldo2", .driver_data = (void *)TPS65217_LDO_2 },
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{ .name = "ldo3", .driver_data = (void *)TPS65217_LDO_3 },
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{ .name = "ldo4", .driver_data = (void *)TPS65217_LDO_4 },
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};
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static struct tps65217_board *tps65217_parse_dt(struct i2c_client *client)
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{
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struct device_node *node = client->dev.of_node;
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struct tps65217_board *pdata;
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struct device_node *regs;
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int count = ARRAY_SIZE(reg_matches);
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int ret, i;
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regs = of_find_node_by_name(node, "regulators");
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if (!regs)
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return NULL;
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ret = of_regulator_match(&client->dev, regs, reg_matches, count);
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of_node_put(regs);
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if ((ret < 0) || (ret > count))
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return NULL;
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count = ret;
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pdata = devm_kzalloc(&client->dev, count * sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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for (i = 0; i < count; i++) {
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if (!reg_matches[i].init_data || !reg_matches[i].of_node)
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continue;
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pdata->tps65217_init_data[i] = reg_matches[i].init_data;
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pdata->of_node[i] = reg_matches[i].of_node;
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}
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return pdata;
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}
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static struct of_device_id tps65217_of_match[] = {
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{ .compatible = "ti,tps65217", },
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{ },
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};
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#else
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static struct tps65217_board *tps65217_parse_dt(struct i2c_client *client)
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{
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return NULL;
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}
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#endif
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static struct regmap_config tps65217_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int __devinit tps65217_probe(struct i2c_client *client,
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const struct i2c_device_id *ids)
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{
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struct tps65217 *tps;
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struct regulator_init_data *reg_data;
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struct tps65217_board *pdata = client->dev.platform_data;
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int i, ret;
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unsigned int version;
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if (!pdata && client->dev.of_node)
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pdata = tps65217_parse_dt(client);
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tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
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if (!tps)
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return -ENOMEM;
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tps->pdata = pdata;
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tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
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if (IS_ERR(tps->regmap)) {
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ret = PTR_ERR(tps->regmap);
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dev_err(tps->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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i2c_set_clientdata(client, tps);
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tps->dev = &client->dev;
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ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
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if (ret < 0) {
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dev_err(tps->dev, "Failed to read revision register: %d\n",
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ret);
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return ret;
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}
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dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
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(version & TPS65217_CHIPID_CHIP_MASK) >> 4,
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version & TPS65217_CHIPID_REV_MASK);
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for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
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struct platform_device *pdev;
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pdev = platform_device_alloc("tps65217-pmic", i);
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if (!pdev) {
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dev_err(tps->dev, "Cannot create regulator %d\n", i);
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continue;
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}
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pdev->dev.parent = tps->dev;
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pdev->dev.of_node = pdata->of_node[i];
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reg_data = pdata->tps65217_init_data[i];
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platform_device_add_data(pdev, reg_data, sizeof(*reg_data));
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tps->regulator_pdev[i] = pdev;
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platform_device_add(pdev);
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}
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return 0;
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}
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static int __devexit tps65217_remove(struct i2c_client *client)
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{
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struct tps65217 *tps = i2c_get_clientdata(client);
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int i;
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for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
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platform_device_unregister(tps->regulator_pdev[i]);
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return 0;
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}
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static const struct i2c_device_id tps65217_id_table[] = {
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{"tps65217", 0xF0},
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{/* end of list */}
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};
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MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
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static struct i2c_driver tps65217_driver = {
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.driver = {
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.name = "tps65217",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(tps65217_of_match),
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},
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.id_table = tps65217_id_table,
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.probe = tps65217_probe,
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.remove = __devexit_p(tps65217_remove),
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};
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static int __init tps65217_init(void)
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{
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return i2c_add_driver(&tps65217_driver);
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}
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subsys_initcall(tps65217_init);
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static void __exit tps65217_exit(void)
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{
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i2c_del_driver(&tps65217_driver);
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}
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module_exit(tps65217_exit);
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MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
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MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
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MODULE_LICENSE("GPL v2");
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