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Subject[PATCH 1/3] regulator: ltc3589: Convert to use simplified DT parsing
Date
Use regulator core's simplified DT parsing code to simplify the driver
implementation.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
---
drivers/regulator/ltc3589.c | 194 +++++++++++-------------------------
1 file changed, 58 insertions(+), 136 deletions(-)

diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c
index 75089b037b72..35741f476024 100644
--- a/drivers/regulator/ltc3589.c
+++ b/drivers/regulator/ltc3589.c
@@ -86,10 +86,6 @@ enum ltc3589_reg {

struct ltc3589_regulator {
struct regulator_desc desc;
-
- /* External feedback voltage divider */
- unsigned int r1;
- unsigned int r2;
};

struct ltc3589 {
@@ -196,11 +192,55 @@ static const struct regulator_ops ltc3589_table_regulator_ops = {
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};

+static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2)
+{
+ uint64_t tmp;
+
+ if (uV == 0)
+ return 0;
+
+ tmp = (uint64_t)uV * r1;
+ do_div(tmp, r2);
+ return uV + (unsigned int)tmp;
+}
+
+static int ltc3589_of_parse_cb(struct device_node *np,
+ const struct regulator_desc *desc,
+ struct regulator_config *config)
+{
+ struct ltc3589 *ltc3589 = config->driver_data;
+ struct ltc3589_regulator *rdesc = &ltc3589->regulator_descs[desc->id];
+ u32 r[2];
+ int ret;
+
+ /* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
+ if (desc->id >= LTC3589_LDO3)
+ return 0;
+
+ ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
+ if (ret) {
+ dev_err(ltc3589->dev, "Failed to parse voltage divider: %d\n",
+ ret);
+ return ret;
+ }
+
+ if (!r[0] || !r[1])
+ return 0;
+
+ rdesc->desc.min_uV = ltc3589_scale(desc->min_uV, r[0], r[1]);
+ rdesc->desc.uV_step = ltc3589_scale(desc->uV_step, r[0], r[1]);
+ rdesc->desc.fixed_uV = ltc3589_scale(desc->fixed_uV, r[0], r[1]);
+
+ return 0;
+}

-#define LTC3589_REG(_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit) \
+#define LTC3589_REG(_name, _of_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit)\
[LTC3589_ ## _name] = { \
.desc = { \
.name = #_name, \
+ .of_match = of_match_ptr(#_of_name), \
+ .regulators_node = of_match_ptr("regulators"), \
+ .of_parse_cb = ltc3589_of_parse_cb, \
.n_voltages = (dtv_mask) + 1, \
.min_uV = (go_bit) ? 362500 : 0, \
.uV_step = (go_bit) ? 12500 : 0, \
@@ -219,109 +259,26 @@ static const struct regulator_ops ltc3589_table_regulator_ops = {
}, \
}

-#define LTC3589_LINEAR_REG(_name, _dtv1) \
- LTC3589_REG(_name, linear, LTC3589_OVEN_ ## _name, \
+#define LTC3589_LINEAR_REG(_name, _of_name, _dtv1) \
+ LTC3589_REG(_name, _of_name, linear, LTC3589_OVEN_ ## _name, \
LTC3589_ ## _dtv1, 0x1f, \
LTC3589_VCCR_ ## _name ## _GO)

-#define LTC3589_FIXED_REG(_name) \
- LTC3589_REG(_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)
+#define LTC3589_FIXED_REG(_name, _of_name) \
+ LTC3589_REG(_name, _of_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0)

static struct ltc3589_regulator ltc3589_regulators[LTC3589_NUM_REGULATORS] = {
- LTC3589_LINEAR_REG(SW1, B1DTV1),
- LTC3589_LINEAR_REG(SW2, B2DTV1),
- LTC3589_LINEAR_REG(SW3, B3DTV1),
- LTC3589_FIXED_REG(BB_OUT),
- LTC3589_REG(LDO1, fixed_standby, 0, 0, 0, 0),
- LTC3589_LINEAR_REG(LDO2, L2DTV1),
- LTC3589_FIXED_REG(LDO3),
- LTC3589_REG(LDO4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2, 0x60, 0),
+ LTC3589_LINEAR_REG(SW1, sw1, B1DTV1),
+ LTC3589_LINEAR_REG(SW2, sw2, B2DTV1),
+ LTC3589_LINEAR_REG(SW3, sw3, B3DTV1),
+ LTC3589_FIXED_REG(BB_OUT, bb-out),
+ LTC3589_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
+ LTC3589_LINEAR_REG(LDO2, ldo2, L2DTV1),
+ LTC3589_FIXED_REG(LDO3, ldo3),
+ LTC3589_REG(LDO4, ldo4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2,
+ 0x60, 0),
};

-#ifdef CONFIG_OF
-static struct of_regulator_match ltc3589_matches[LTC3589_NUM_REGULATORS] = {
- { .name = "sw1", },
- { .name = "sw2", },
- { .name = "sw3", },
- { .name = "bb-out", },
- { .name = "ldo1", }, /* standby */
- { .name = "ldo2", },
- { .name = "ldo3", },
- { .name = "ldo4", },
-};
-
-static int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589)
-{
- struct device *dev = ltc3589->dev;
- struct device_node *node;
- int i, ret;
-
- node = of_get_child_by_name(dev->of_node, "regulators");
- if (!node) {
- dev_err(dev, "regulators node not found\n");
- return -EINVAL;
- }
-
- ret = of_regulator_match(dev, node, ltc3589_matches,
- ARRAY_SIZE(ltc3589_matches));
- of_node_put(node);
- if (ret < 0) {
- dev_err(dev, "Error parsing regulator init data: %d\n", ret);
- return ret;
- }
- if (ret != LTC3589_NUM_REGULATORS) {
- dev_err(dev, "Only %d regulators described in device tree\n",
- ret);
- return -EINVAL;
- }
-
- /* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */
- for (i = 0; i < LTC3589_LDO3; i++) {
- struct ltc3589_regulator *desc = &ltc3589->regulator_descs[i];
- struct device_node *np = ltc3589_matches[i].of_node;
- u32 vdiv[2];
-
- ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider",
- vdiv, 2);
- if (ret) {
- dev_err(dev, "Failed to parse voltage divider: %d\n",
- ret);
- return ret;
- }
-
- desc->r1 = vdiv[0];
- desc->r2 = vdiv[1];
- }
-
- return 0;
-}
-
-static inline struct regulator_init_data *match_init_data(int index)
-{
- return ltc3589_matches[index].init_data;
-}
-
-static inline struct device_node *match_of_node(int index)
-{
- return ltc3589_matches[index].of_node;
-}
-#else
-static inline int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589)
-{
- return 0;
-}
-
-static inline struct regulator_init_data *match_init_data(int index)
-{
- return NULL;
-}
-
-static inline struct device_node *match_of_node(int index)
-{
- return NULL;
-}
-#endif
-
static bool ltc3589_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
@@ -409,7 +366,6 @@ static const struct regmap_config ltc3589_regmap_config = {
.cache_type = REGCACHE_RBTREE,
};

-
static irqreturn_t ltc3589_isr(int irq, void *dev_id)
{
struct ltc3589 *ltc3589 = dev_id;
@@ -443,28 +399,6 @@ static irqreturn_t ltc3589_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}

-static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2)
-{
- uint64_t tmp;
- if (uV == 0)
- return 0;
- tmp = (uint64_t)uV * r1;
- do_div(tmp, r2);
- return uV + (unsigned int)tmp;
-}
-
-static void ltc3589_apply_fb_voltage_divider(struct ltc3589_regulator *rdesc)
-{
- struct regulator_desc *desc = &rdesc->desc;
-
- if (!rdesc->r1 || !rdesc->r2)
- return;
-
- desc->min_uV = ltc3589_scale(desc->min_uV, rdesc->r1, rdesc->r2);
- desc->uV_step = ltc3589_scale(desc->uV_step, rdesc->r1, rdesc->r2);
- desc->fixed_uV = ltc3589_scale(desc->fixed_uV, rdesc->r1, rdesc->r2);
-}
-
static int ltc3589_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -502,25 +436,13 @@ static int ltc3589_probe(struct i2c_client *client,
return ret;
}

- ret = ltc3589_parse_regulators_dt(ltc3589);
- if (ret)
- return ret;
-
for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
struct ltc3589_regulator *rdesc = &ltc3589->regulator_descs[i];
struct regulator_desc *desc = &rdesc->desc;
- struct regulator_init_data *init_data;
struct regulator_config config = { };

- init_data = match_init_data(i);
-
- if (i < LTC3589_LDO3)
- ltc3589_apply_fb_voltage_divider(rdesc);
-
config.dev = dev;
- config.init_data = init_data;
config.driver_data = ltc3589;
- config.of_node = match_of_node(i);

ltc3589->regulators[i] = devm_regulator_register(dev, desc,
&config);
--
2.17.1
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