[RFC PATCH 1/3] eeprom: Add a simple EEPROM framework

Srinivas Kandagatla
2015-02-20T08:14:34Z

On 20/02/15 02:36, Stephen Boyd wrote:
> On 02/19/15 09:08, Srinivas Kandagatla wrote:
>> diff --git a/drivers/Kconfig b/drivers/Kconfig
>> index c70d6e4..d7afc82 100644
>> --- a/drivers/Kconfig
>> +++ b/drivers/Kconfig
>> @@ -184,4 +184,6 @@ source "drivers/thunderbolt/Kconfig"
>>
>> source "drivers/android/Kconfig"
>>
>> +source "drivers/eeprom/Kconfig"
>> +
>> endmenu
>> diff --git a/drivers/Makefile b/drivers/Makefile
>> index 527a6da..57eb5b0 100644
>> --- a/drivers/Makefile
>> +++ b/drivers/Makefile
>> @@ -165,3 +165,4 @@ obj-$(CONFIG_RAS) += ras/
>> obj-$(CONFIG_THUNDERBOLT) += thunderbolt/
>> obj-$(CONFIG_CORESIGHT) += coresight/
>> obj-$(CONFIG_ANDROID) += android/
>> +obj-$(CONFIG_EEPROM) += eeprom/
>> diff --git a/drivers/eeprom/Kconfig b/drivers/eeprom/Kconfig
>> new file mode 100644
>> index 0000000..2c5452a
>> --- /dev/null
>> +++ b/drivers/eeprom/Kconfig
>> @@ -0,0 +1,19 @@
>> +menuconfig EEPROM
>> + bool "EEPROM Support"
>> + depends on OF
>
> Doesn't this need some sort of select REGMAP somewhere?
May be depends REGMAP would be good.

>
> Also, why do we need to use regmap for the eeprom framework read/write
> ops? I liked the simple eeprom::{read,write} API that Maxime had. The
> regmap part could be a regmap-eeprom driver that implements read/write
> ops like you've done in the core.
regmap bus does the same job.

The only reason for using regmap here is to have more generic drivers
for eeprom providers based on different buses like mmio, i2c, spi...
As of today we could just make the qfprom eeprom provider as more
generic eeprom-mmio provider. May be sunxi_sid could reuse it too with
some effort.

In future It may be possible to have eeprom-i2c or eeprom-spi providers.

>

>> +
>> +struct eeprom_device {
>> + struct regmap *regmap;
>> + int stride;
>> + size_t size;
>> + struct device *dev;
>> +
>> + /* Internal to framework */
>> + struct device edev;
>> + int id;
>> + struct list_head list;
>
> Should there be a module owner here to handle module removal?
>

Good point, we should do some reference counting.