Re: [PATCH v2] i2c: slave-eeprom: update documentation

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Hi Wolfram,

Thanks for your work.

On 2020-06-28 20:54:26 +0200, Wolfram Sang wrote:
> Add more details which have either been missing ever since or describe
> recent additions.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>

> ---
> 
> Change since v1: add 'help' keyword to the Kconfig explanation
> 
>  Documentation/i2c/slave-eeprom-backend.rst | 22 +++++++++++++++++-----
>  drivers/i2c/Kconfig                        |  4 ++++
>  2 files changed, 21 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/i2c/slave-eeprom-backend.rst b/Documentation/i2c/slave-eeprom-backend.rst
> index 0b8cd83698e0..38d951f10302 100644
> --- a/Documentation/i2c/slave-eeprom-backend.rst
> +++ b/Documentation/i2c/slave-eeprom-backend.rst
> @@ -1,14 +1,26 @@
>  ==============================
> -Linux I2C slave eeprom backend
> +Linux I2C slave EEPROM backend
>  ==============================
>  
> -by Wolfram Sang <wsa@xxxxxxxxxxxxxxxxxxxx> in 2014-15
> +by Wolfram Sang <wsa@xxxxxxxxxxxxxxxxxxxx> in 2014-20
>  
> -This is a proof-of-concept backend which acts like an EEPROM on the connected
> -I2C bus. The memory contents can be modified from userspace via this file
> -located in sysfs::
> +This backend simulates an EEPROM on the connected I2C bus. Its memory contents
> +can be accessed from userspace via this file located in sysfs::
>  
>  	/sys/bus/i2c/devices/<device-directory>/slave-eeprom
>  
> +The following types are available: 24c02, 24c32, 24c64, and 24c512. Read-only
> +variants are also supported. The name needed for instantiating has the form
> +'slave-<type>[ro]'. Examples follow:
> +
> +24c02, read/write, address 0x64:
> +  # echo slave-24c02 0x1064 > /sys/bus/i2c/devices/i2c-1/new_device
> +
> +24c512, read-only, address 0x42:
> +  # echo slave-24c512ro 0x1042 > /sys/bus/i2c/devices/i2c-1/new_device
> +
> +You can also preload data during boot if a device-property named
> +'firmware-name' contains a valid filename (DT or ACPI only).
> +
>  As of 2015, Linux doesn't support poll on binary sysfs files, so there is no
>  notification when another master changed the content.
> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
> index ef39c83aaf33..dbcbb8a6024e 100644
> --- a/drivers/i2c/Kconfig
> +++ b/drivers/i2c/Kconfig
> @@ -119,6 +119,10 @@ if I2C_SLAVE
>  config I2C_SLAVE_EEPROM
>  	tristate "I2C eeprom slave driver"
>  
> +	help
> +	  This backend makes Linux behave like an I2C EEPROM. Please read
> +	  Documentation/i2c/slave-eeprom-backend.rst for further details.
> +
>  endif
>  
>  config I2C_DEBUG_CORE
> -- 
> 2.20.1
> 

-- 
Regards,
Niklas Söderlund



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