[U-Boot] [PATH v3 1/2] sf: Add status register reading support

[Jagan Teki]

Hi Simon,

On Fri, Jan 11, 2013 at 7:52 AM, Simon Glass <sjg at chromium.org> wrote:
> Hi Jagannadha
>
> On Thu, Jan 3, 2013 at 6:51 AM, Jagannadha Sutradharudu Teki
> <jagannadh.teki at gmail.com> wrote:
>> This patch provides support to read a flash status register.
>>
>> Status register contains a control bits used to verify
>> the progress of flash program and erase operations.
>>
>> User need to get the data through spi_flash_cmd_read_status()
>> based on their usage.
>
> Do you have a console command for this, and the control register also?

There is no sf command for status register read.

Usage is based on the user code, see how I am using this function on
Quad Enable bit setting.
http://patchwork.ozlabs.org/patch/207454/

Please tell me if you still unclear.

Thanks,
Jagan.

>
> Regards,
> Simon
>
>>
>> Signed-off-by: Jagannadha Sutradharudu Teki <jagannadh.teki at gmail.com>
>> ---
>> Changes in v3:
>>         improved coding style
>>
>>  drivers/mtd/spi/spi_flash.c          |    8 ++++++++
>>  drivers/mtd/spi/spi_flash_internal.h |    3 +++
>>  2 files changed, 11 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c
>> index 9e8939c..0f05b91 100644
>> --- a/drivers/mtd/spi/spi_flash.c
>> +++ b/drivers/mtd/spi/spi_flash.c
>> @@ -264,6 +264,14 @@ int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr)
>>         return 0;
>>  }
>>
>> +int spi_flash_cmd_read_status(struct spi_flash *flash, void *data)
>> +{
>> +       u8 cmd;
>> +
>> +       cmd = CMD_READ_STATUS;
>> +       return spi_flash_read_common(flash, &cmd, sizeof(cmd), (void *)data, 1);
>> +}
>> +
>>  /*
>>   * The following table holds all device probe functions
>>   *
>> diff --git a/drivers/mtd/spi/spi_flash_internal.h b/drivers/mtd/spi/spi_flash_internal.h
>> index 141cfa8..8232595 100644
>> --- a/drivers/mtd/spi/spi_flash_internal.h
>> +++ b/drivers/mtd/spi/spi_flash_internal.h
>> @@ -77,6 +77,9 @@ static inline int spi_flash_cmd_write_disable(struct spi_flash *flash)
>>  /* Program the status register. */
>>  int spi_flash_cmd_write_status(struct spi_flash *flash, u8 sr);
>>
>> +/* Read the status register */
>> +int spi_flash_cmd_read_status(struct spi_flash *flash, void *data);
>> +
>>  /*
>>   * Same as spi_flash_cmd_read() except it also claims/releases the SPI
>>   * bus. Used as common part of the ->read() operation.
>> --
>> 1.7.0.4
>>
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