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hwmon: (pmbus/mp2975) Make phase count variable 

In order to add support for MP2973 and MP2971 replace hardcoded
phase count for both channels by a variable.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@9elements.com>
Link: https://lore.kernel.org/r/20230714135124.2645339-5-Naresh.Solanki@9elements.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Patrick Rudolph 2023-07-14 15:51:13 +02:00 committed by Guenter Roeck
parent 1feb31e810
commit e2c90b481d
1 changed files with 20 additions and 13 deletions
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33
drivers/hwmon/pmbus/mp2975.c
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@ -61,10 +61,15 @@ enum chips {
mp2975
};
static const int mp2975_max_phases[][MP2975_PAGE_NUM] = {
[mp2975] = { MP2975_MAX_PHASE_RAIL1, MP2975_MAX_PHASE_RAIL2 },
};
struct mp2975_data {
struct pmbus_driver_info info;
enum chips chip_id;
int vout_scale;
int max_phases[MP2975_PAGE_NUM];
int vid_step[MP2975_PAGE_NUM];
int vref[MP2975_PAGE_NUM];
int vref_off[MP2975_PAGE_NUM];
@ -304,25 +309,25 @@ static int mp2975_read_word_data(struct i2c_client *client, int page,
return ret;
}
static int mp2975_identify_multiphase_rail2(struct i2c_client *client)
static int mp2975_identify_multiphase_rail2(struct i2c_client *client,
struct mp2975_data *data)
{
int ret;
/*
* Identify multiphase for rail 2 - could be from 0 to 4.
* Identify multiphase for rail 2 - could be from 0 to data->max_phases[1].
* In case phase number is zero – only page zero is supported
*/
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2);
if (ret < 0)
return ret;
/* Identify multiphase for rail 2 - could be from 0 to 4. */
ret = i2c_smbus_read_word_data(client, MP2975_MFR_VR_MULTI_CONFIG_R2);
if (ret < 0)
return ret;
ret &= GENMASK(2, 0);
return (ret >= 4) ? 4 : ret;
return (ret >= data->max_phases[1]) ? data->max_phases[1] : ret;
}
static void mp2975_set_phase_rail1(struct pmbus_driver_info *info)
@ -353,7 +358,7 @@ mp2975_identify_multiphase(struct i2c_client *client, struct mp2975_data *data,
if (ret < 0)
return ret;
/* Identify multiphase for rail 1 - could be from 1 to 8. */
/* Identify multiphase for rail 1 - could be from 1 to data->max_phases[0]. */
ret = i2c_smbus_read_word_data(client, MP2975_MFR_VR_MULTI_CONFIG_R1);
if (ret <= 0)
return ret;
@ -361,19 +366,19 @@ mp2975_identify_multiphase(struct i2c_client *client, struct mp2975_data *data,
info->phases[0] = ret & GENMASK(3, 0);
/*
* The device provides a total of 8 PWM pins, and can be configured
* The device provides a total of $n PWM pins, and can be configured
* to different phase count applications for rail 1 and rail 2.
* Rail 1 can be set to 8 phases, while rail 2 can only be set to 4
* phases at most. When rail 1’s phase count is configured as 0, rail
* Rail 1 can be set to $n phases, while rail 2 can be set to less than
* that. When rail 1’s phase count is configured as 0, rail
* 1 operates with 1-phase DCM. When rail 2 phase count is configured
* as 0, rail 2 is disabled.
*/
if (info->phases[0] > MP2975_MAX_PHASE_RAIL1)
if (info->phases[0] > data->max_phases[0])
return -EINVAL;
mp2975_set_phase_rail1(info);
num_phases2 = min(MP2975_MAX_PHASE_RAIL1 - info->phases[0],
MP2975_MAX_PHASE_RAIL2);
num_phases2 = min(data->max_phases[0] - info->phases[0],
data->max_phases[1]);
if (info->phases[1] && info->phases[1] <= num_phases2)
mp2975_set_phase_rail2(info, num_phases2);
@ -669,11 +674,13 @@ static int mp2975_probe(struct i2c_client *client)
else
data->chip_id = i2c_match_id(mp2975_id, client)->driver_data;
memcpy(&data->info, &mp2975_info, sizeof(*info));
memcpy(data->max_phases, mp2975_max_phases[data->chip_id],
sizeof(data->max_phases));
info = &data->info;
/* Identify multiphase configuration for rail 2. */
ret = mp2975_identify_multiphase_rail2(client);
ret = mp2975_identify_multiphase_rail2(client, data);
if (ret < 0)
return ret;