mtd: spi-nor: debugfs: Add a locked sectors map

In order to get a very clear view of the sectors being locked, besides
the `params` output giving the ranges, we may want to see a proper map
of the sectors and for each of them, their status. Depending on the use
case, this map may be easier to parse by humans and gives a more acurate
feeling of the situation. At least myself, for the few locking-related
developments I recently went through, I found it very useful to get a
clearer mental model of what was locked/unlocked.

Here is an example of output:

$ cat /sys/kernel/debug/spi-nor/spi0.0/locked-sectors-map
Locked sectors map (x: locked, .: unlocked, unit: 64kiB)
 0x00000000 (#    0): ................ ................ ................ ................
 0x00400000 (#   64): ................ ................ ................ ................
 0x00800000 (#  128): ................ ................ ................ ................
 0x00c00000 (#  192): ................ ................ ................ ................
 0x01000000 (#  256): ................ ................ ................ ................
 0x01400000 (#  320): ................ ................ ................ ................
 0x01800000 (#  384): ................ ................ ................ ................
 0x01c00000 (#  448): ................ ................ ................ ................
 0x02000000 (#  512): ................ ................ ................ ................
 0x02400000 (#  576): ................ ................ ................ ................
 0x02800000 (#  640): ................ ................ ................ ................
 0x02c00000 (#  704): ................ ................ ................ ................
 0x03000000 (#  768): ................ ................ ................ ................
 0x03400000 (#  832): ................ ................ ................ ................
 0x03800000 (#  896): ................ ................ ................ ................
 0x03c00000 (#  960): ................ ................ ................ ..............xx

The output is wrapped at 64 sectors, spaces every 16 sectors are
improving the readability, every line starts by the first sector
offset (hex) and number (decimal).

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
[pratyush@kernel.org: split the debugfs_create_file() into two lines]
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>

0 files changed, 0 insertions, 0 deletions