regulator: ltc3589: Convert to use simplified DT parsing
Use regulator core's simplified DT parsing code to simplify the driver implementation. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@kernel.org>hifive-unleashed-5.2
Axel Lin
Mark Brown
parent
362af73650
commit
ce62ba3afd
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@ -86,10 +86,6 @@ enum ltc3589_reg {
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struct ltc3589_regulator {
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struct regulator_desc desc;
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/* External feedback voltage divider */
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unsigned int r1;
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unsigned int r2;
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};
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struct ltc3589 {
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@ -196,11 +192,55 @@ static const struct regulator_ops ltc3589_table_regulator_ops = {
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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};
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static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2)
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{
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uint64_t tmp;
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#define LTC3589_REG(_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit) \
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if (uV == 0)
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return 0;
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tmp = (uint64_t)uV * r1;
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do_div(tmp, r2);
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return uV + (unsigned int)tmp;
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}
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static int ltc3589_of_parse_cb(struct device_node *np,
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const struct regulator_desc *desc,
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struct regulator_config *config)
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{
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struct ltc3589 *ltc3589 = config->driver_data;
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struct ltc3589_regulator *rdesc = <c3589->regulator_descs[desc->id];
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u32 r[2];
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int ret;
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/* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
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if (desc->id >= LTC3589_LDO3)
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return 0;
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ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
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if (ret) {
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dev_err(ltc3589->dev, "Failed to parse voltage divider: %d\n",
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ret);
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return ret;
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}
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if (!r[0] || !r[1])
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return 0;
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rdesc->desc.min_uV = ltc3589_scale(desc->min_uV, r[0], r[1]);
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rdesc->desc.uV_step = ltc3589_scale(desc->uV_step, r[0], r[1]);
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rdesc->desc.fixed_uV = ltc3589_scale(desc->fixed_uV, r[0], r[1]);
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return 0;
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}
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#define LTC3589_REG(_name, _of_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit)\
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[LTC3589_ ## _name] = { \
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.desc = { \
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.name = #_name, \
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.of_match = of_match_ptr(#_of_name), \
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.regulators_node = of_match_ptr("regulators"), \
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.of_parse_cb = ltc3589_of_parse_cb, \
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.n_voltages = (dtv_mask) + 1, \
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.min_uV = (go_bit) ? 362500 : 0, \
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.uV_step = (go_bit) ? 12500 : 0, \
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@ -219,109 +259,26 @@ static const struct regulator_ops ltc3589_table_regulator_ops = {
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}, \
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}
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#define LTC3589_LINEAR_REG(_name, _dtv1) \
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LTC3589_REG(_name, linear, LTC3589_OVEN_ ## _name, \
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#define LTC3589_LINEAR_REG(_name, _of_name, _dtv1) \
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LTC3589_REG(_name, _of_name, linear, LTC3589_OVEN_ ## _name, \
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LTC3589_ ## _dtv1, 0x1f, \
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LTC3589_VCCR_ ## _name ## _GO)
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#define LTC3589_FIXED_REG(_name) \
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LTC3589_REG(_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)
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#define LTC3589_FIXED_REG(_name, _of_name) \
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LTC3589_REG(_name, _of_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)
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static struct ltc3589_regulator ltc3589_regulators[LTC3589_NUM_REGULATORS] = {
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LTC3589_LINEAR_REG(SW1, B1DTV1),
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LTC3589_LINEAR_REG(SW2, B2DTV1),
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LTC3589_LINEAR_REG(SW3, B3DTV1),
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LTC3589_FIXED_REG(BB_OUT),
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LTC3589_REG(LDO1, fixed_standby, 0, 0, 0, 0),
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LTC3589_LINEAR_REG(LDO2, L2DTV1),
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LTC3589_FIXED_REG(LDO3),
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LTC3589_REG(LDO4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2, 0x60, 0),
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LTC3589_LINEAR_REG(SW1, sw1, B1DTV1),
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LTC3589_LINEAR_REG(SW2, sw2, B2DTV1),
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LTC3589_LINEAR_REG(SW3, sw3, B3DTV1),
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LTC3589_FIXED_REG(BB_OUT, bb-out),
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LTC3589_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
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LTC3589_LINEAR_REG(LDO2, ldo2, L2DTV1),
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LTC3589_FIXED_REG(LDO3, ldo3),
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LTC3589_REG(LDO4, ldo4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2,
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0x60, 0),
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};
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#ifdef CONFIG_OF
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static struct of_regulator_match ltc3589_matches[LTC3589_NUM_REGULATORS] = {
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{ .name = "sw1", },
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{ .name = "sw2", },
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{ .name = "sw3", },
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{ .name = "bb-out", },
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{ .name = "ldo1", }, /* standby */
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{ .name = "ldo2", },
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{ .name = "ldo3", },
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{ .name = "ldo4", },
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};
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static int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589)
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{
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struct device *dev = ltc3589->dev;
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struct device_node *node;
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int i, ret;
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node = of_get_child_by_name(dev->of_node, "regulators");
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if (!node) {
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dev_err(dev, "regulators node not found\n");
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return -EINVAL;
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}
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ret = of_regulator_match(dev, node, ltc3589_matches,
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ARRAY_SIZE(ltc3589_matches));
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of_node_put(node);
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if (ret < 0) {
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dev_err(dev, "Error parsing regulator init data: %d\n", ret);
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return ret;
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}
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if (ret != LTC3589_NUM_REGULATORS) {
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dev_err(dev, "Only %d regulators described in device tree\n",
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ret);
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return -EINVAL;
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}
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/* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
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for (i = 0; i < LTC3589_LDO3; i++) {
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struct ltc3589_regulator *desc = <c3589->regulator_descs[i];
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struct device_node *np = ltc3589_matches[i].of_node;
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u32 vdiv[2];
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ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider",
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vdiv, 2);
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if (ret) {
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dev_err(dev, "Failed to parse voltage divider: %d\n",
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ret);
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return ret;
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}
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desc->r1 = vdiv[0];
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desc->r2 = vdiv[1];
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}
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return 0;
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}
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static inline struct regulator_init_data *match_init_data(int index)
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{
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return ltc3589_matches[index].init_data;
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}
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static inline struct device_node *match_of_node(int index)
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{
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return ltc3589_matches[index].of_node;
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}
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#else
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static inline int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589)
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{
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return 0;
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}
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static inline struct regulator_init_data *match_init_data(int index)
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{
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return NULL;
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}
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static inline struct device_node *match_of_node(int index)
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{
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return NULL;
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}
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#endif
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static bool ltc3589_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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@ -409,7 +366,6 @@ static const struct regmap_config ltc3589_regmap_config = {
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.cache_type = REGCACHE_RBTREE,
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};
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static irqreturn_t ltc3589_isr(int irq, void *dev_id)
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{
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struct ltc3589 *ltc3589 = dev_id;
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@ -443,28 +399,6 @@ static irqreturn_t ltc3589_isr(int irq, void *dev_id)
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return IRQ_HANDLED;
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}
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static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2)
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{
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uint64_t tmp;
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if (uV == 0)
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return 0;
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tmp = (uint64_t)uV * r1;
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do_div(tmp, r2);
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return uV + (unsigned int)tmp;
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}
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static void ltc3589_apply_fb_voltage_divider(struct ltc3589_regulator *rdesc)
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{
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struct regulator_desc *desc = &rdesc->desc;
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if (!rdesc->r1 || !rdesc->r2)
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return;
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desc->min_uV = ltc3589_scale(desc->min_uV, rdesc->r1, rdesc->r2);
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desc->uV_step = ltc3589_scale(desc->uV_step, rdesc->r1, rdesc->r2);
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desc->fixed_uV = ltc3589_scale(desc->fixed_uV, rdesc->r1, rdesc->r2);
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}
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static int ltc3589_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -502,25 +436,13 @@ static int ltc3589_probe(struct i2c_client *client,
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return ret;
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}
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ret = ltc3589_parse_regulators_dt(ltc3589);
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if (ret)
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return ret;
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for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
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struct ltc3589_regulator *rdesc = <c3589->regulator_descs[i];
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struct regulator_desc *desc = &rdesc->desc;
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struct regulator_init_data *init_data;
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struct regulator_config config = { };
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init_data = match_init_data(i);
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if (i < LTC3589_LDO3)
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ltc3589_apply_fb_voltage_divider(rdesc);
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config.dev = dev;
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config.init_data = init_data;
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config.driver_data = ltc3589;
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config.of_node = match_of_node(i);
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ltc3589->regulators[i] = devm_regulator_register(dev, desc,
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&config);
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