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https://github.com/edk2-porting/linux-next.git
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21b72156ed
Few ROHM PMICs allow setting the voltage states for different system states like RUN, IDLE, SUSPEND and LPSR. States are then changed via SoC specific mechanisms. bd718x7 driver implemented device-tree parsing functions for these state specific voltages. The parsing functions can be re-used by other ROHM chip drivers like bd71828. Split the generic functions from bd718x7-regulator.c to rohm-regulator.c and export them for other modules to use. Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Acked-by: Mark Brown <broonie@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2020 ROHM Semiconductors
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#include <linux/errno.h>
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#include <linux/mfd/rohm-generic.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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static int set_dvs_level(const struct regulator_desc *desc,
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struct device_node *np, struct regmap *regmap,
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char *prop, unsigned int reg, unsigned int mask,
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unsigned int omask, unsigned int oreg)
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{
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int ret, i;
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uint32_t uv;
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ret = of_property_read_u32(np, prop, &uv);
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if (ret) {
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if (ret != -EINVAL)
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return ret;
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return 0;
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}
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if (uv == 0) {
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if (omask)
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return regmap_update_bits(regmap, oreg, omask, 0);
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}
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for (i = 0; i < desc->n_voltages; i++) {
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ret = regulator_desc_list_voltage_linear_range(desc, i);
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if (ret < 0)
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continue;
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if (ret == uv) {
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i <<= ffs(desc->vsel_mask) - 1;
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ret = regmap_update_bits(regmap, reg, mask, i);
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if (omask && !ret)
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ret = regmap_update_bits(regmap, oreg, omask,
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omask);
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break;
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}
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}
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return ret;
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}
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int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
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struct device_node *np,
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const struct regulator_desc *desc,
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struct regmap *regmap)
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{
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int i, ret = 0;
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char *prop;
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unsigned int reg, mask, omask, oreg = desc->enable_reg;
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for (i = 0; i < ROHM_DVS_LEVEL_MAX && !ret; i++) {
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if (dvs->level_map & (1 << i)) {
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switch (i + 1) {
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case ROHM_DVS_LEVEL_RUN:
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prop = "rohm,dvs-run-voltage";
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reg = dvs->run_reg;
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mask = dvs->run_mask;
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omask = dvs->run_on_mask;
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break;
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case ROHM_DVS_LEVEL_IDLE:
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prop = "rohm,dvs-idle-voltage";
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reg = dvs->idle_reg;
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mask = dvs->idle_mask;
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omask = dvs->idle_on_mask;
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break;
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case ROHM_DVS_LEVEL_SUSPEND:
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prop = "rohm,dvs-suspend-voltage";
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reg = dvs->suspend_reg;
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mask = dvs->suspend_mask;
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omask = dvs->suspend_on_mask;
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break;
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case ROHM_DVS_LEVEL_LPSR:
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prop = "rohm,dvs-lpsr-voltage";
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reg = dvs->lpsr_reg;
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mask = dvs->lpsr_mask;
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omask = dvs->lpsr_on_mask;
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break;
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default:
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return -EINVAL;
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}
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ret = set_dvs_level(desc, np, regmap, prop, reg, mask,
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omask, oreg);
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}
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}
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return ret;
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}
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EXPORT_SYMBOL(rohm_regulator_set_dvs_levels);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
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MODULE_DESCRIPTION("Generic helpers for ROHM PMIC regulator drivers");
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