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Date: Fri, 25 Sep 2020 14:29:42 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
broonie@...nel.org
Cc: alsa-devel@...a-project.org, srivasam@...eaurora.org,
lgirdwood@...il.com, gregkh@...uxfoundation.org, rafael@...nel.org,
tiwai@...e.com, rohitkr@...eaurora.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] regmap: add support to regmap_field_bulk_alloc/free
apis
Thanks Pierre,
On 25/09/2020 14:12, Pierre-Louis Bossart wrote:
>
>
> On 9/25/20 4:28 AM, Srinivas Kandagatla wrote:
>> Usage of regmap_field_alloc becomes much overhead when number of fields
>> exceed more than 3.
>> QCOM LPASS driver has extensively converted to use regmap_fileds.
>
> Multiple typos scattered in this patch: fileds -> fields?
>
thanks for checking this, I will fix that in next spin!
--srini
>>
>> Using new bluk api to allocate fields makes it much more cleaner code
>> to read!
>
> bulk api?
>
>>
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>> Tested-by: Srinivasa Rao Mandadapu <srivasam@...eaurora.org>
>> ---
>> drivers/base/regmap/regmap.c | 100 +++++++++++++++++++++++++++++++++++
>> include/linux/regmap.h | 11 ++++
>> 2 files changed, 111 insertions(+)
>>
>> diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
>> index aec3f26bf711..271740a163ad 100644
>> --- a/drivers/base/regmap/regmap.c
>> +++ b/drivers/base/regmap/regmap.c
>> @@ -1270,6 +1270,106 @@ struct regmap_field
>> *devm_regmap_field_alloc(struct device *dev,
>> }
>> EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
>> +
>> +/**
>> + * regmap_field_bulk_alloc() - Allocate and initialise a bulk
>> register field.
>> + *
>> + * @regmap: regmap bank in which this register field is located.
>> + * @rm_field: regmap register fileds with in the bank.
>> + * @reg_field: Register fields with in the bank.
>> + * @num_fields: Number of register fileds.
>> + *
>> + * The return value will be an -ENOMEM on error or zero for success.
>> + * Newly allocated regmap_fields should be freed by calling
>> + * regmap_field_bulk_free()
>> + */
>> +int regmap_field_bulk_alloc(struct regmap *regmap,
>> + struct regmap_field **rm_field,
>> + struct reg_field *reg_field,
>> + int num_fields)
>> +{
>> + struct regmap_field *rf;
>> + int i;
>> +
>> + rf = kcalloc(num_fields, sizeof(*rf), GFP_KERNEL);
>> + if (!rf)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < num_fields; i++) {
>> + regmap_field_init(&rf[i], regmap, reg_field[i]);
>> + rm_field[i] = &rf[i];
>> + }
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(regmap_field_bulk_alloc);
>> +
>> +/**
>> + * devm_regmap_field_bulk_alloc() - Allocate and initialise a bulk
>> register
>> + * fields.
>> + *
>> + * @dev: Device that will be interacted with
>> + * @regmap: regmap bank in which this register field is located.
>> + * @rm_field: regmap register fileds with in the bank.
>> + * @reg_field: Register fields with in the bank.
>
> within?
>
>> + * @num_fields: Number of register fileds.
>> + *
>> + * The return value will be an -ENOMEM on error or zero for success.
>> + * Newly allocated regmap_fields will be automatically freed by the
>> + * device management code.
>> + */
>> +int devm_regmap_field_bulk_alloc(struct device *dev,
>> + struct regmap *regmap,
>> + struct regmap_field **rm_field,
>> + struct reg_field *reg_field,
>> + int num_fields)
>> +{
>> + struct regmap_field *rf;
>> + int i;
>> +
>> + rf = devm_kcalloc(dev, num_fields, sizeof(*rf), GFP_KERNEL);
>> + if (!rf)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < num_fields; i++) {
>> + regmap_field_init(&rf[i], regmap, reg_field[i]);
>> + rm_field[i] = &rf[i];
>> + }
>> +
>> + return 0;
>> +}
>> +EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_alloc);
>> +
>> +/**
>> + * regmap_field_bulk_free() - Free register field allocated using
>> + * regmap_field_bulk_alloc.
>> + *
>> + * @field: regmap fields which should be freed.
>> + */
>> +void regmap_field_bulk_free(struct regmap_field *field)
>> +{
>> + kfree(field);
>> +}
>> +EXPORT_SYMBOL_GPL(regmap_field_bulk_free);
>> +
>> +/**
>> + * devm_regmap_field_bulk_free() - Free a bulk register field
>> allocated using
>> + * devm_regmap_field_bulk_alloc.
>> + *
>> + * @dev: Device that will be interacted with
>> + * @field: regmap field which should be freed.
>> + *
>> + * Free register field allocated using
>> devm_regmap_field_bulk_alloc(). Usually
>> + * drivers need not call this function, as the memory allocated via devm
>> + * will be freed as per device-driver life-cyle.
>> + */
>> +void devm_regmap_field_bulk_free(struct device *dev,
>> + struct regmap_field *field)
>> +{
>> + devm_kfree(dev, field);
>> +}
>> +EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_free);
>> +
>> /**
>> * devm_regmap_field_free() - Free a register field allocated using
>> * devm_regmap_field_alloc.
>> diff --git a/include/linux/regmap.h b/include/linux/regmap.h
>> index 0c49d59168b5..a35ec0a0d6e0 100644
>> --- a/include/linux/regmap.h
>> +++ b/include/linux/regmap.h
>> @@ -1189,6 +1189,17 @@ struct regmap_field
>> *devm_regmap_field_alloc(struct device *dev,
>> struct regmap *regmap, struct reg_field reg_field);
>> void devm_regmap_field_free(struct device *dev, struct
>> regmap_field *field);
>> +int regmap_field_bulk_alloc(struct regmap *regmap,
>> + struct regmap_field **rm_field,
>> + struct reg_field *reg_field,
>> + int num_fields);
>> +void regmap_field_bulk_free(struct regmap_field *field);
>> +int devm_regmap_field_bulk_alloc(struct device *dev, struct regmap
>> *regmap,
>> + struct regmap_field **field,
>> + struct reg_field *reg_field, int num_fields);
>> +void devm_regmap_field_bulk_free(struct device *dev,
>> + struct regmap_field *field);
>> +
>> int regmap_field_read(struct regmap_field *field, unsigned int *val);
>> int regmap_field_update_bits_base(struct regmap_field *field,
>> unsigned int mask, unsigned int val,
>>
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