iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mtd: spi-nor: Add documentation for spi_nor_soft_reset()

Browse Source 
Document what the function does and that it should only be used when it
is known that the device supports it. This will avoid unaware
programmers thinking that they can arbitrarily use it to reset the
device.

Suggested-by: Michael Walle <michael@walle.cc>
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Michael Walle <michael@walle.cc>
This commit is contained in:
Pratyush Yadav 2021-05-11 15:09:58 +05:30 committed by Vignesh Raghavendra
parent 5c26d52c9e
commit ccfb7cf18f
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/mtd/spi-nor/core.c
View File

@ -2839,6 +2839,21 @@ static int spi_nor_init(struct spi_nor *nor)
return 0;
}
/**
* spi_nor_soft_reset() - Perform a software reset
* @nor: pointer to 'struct spi_nor'
*
* Performs a "Soft Reset and Enter Default Protocol Mode" sequence which resets
* the device to its power-on-reset state. This is useful when the software has
* made some changes to device (volatile) registers and needs to reset it before
* shutting down, for example.
*
* Not every flash supports this sequence. The same set of opcodes might be used
* for some other operation on a flash that does not support this. Support for
* this sequence can be discovered via SFDP in the BFPT table.
*
* Return: 0 on success, -errno otherwise.
*/
static void spi_nor_soft_reset(struct spi_nor *nor)
{
struct spi_mem_op op;