[PATCH v3 23/23] mtd: spi-nor: debugfs: Expose SR opcodes and QE mask

Expose Status Register opcodes based on the flash capabilities
discovered while parsing the SFDP QER field.

Value '0' indicates an absence of opcode (non supported), we do not
print anything in that case.

The QE bit is also displayed.

Example on a W25Q02JV-M:

$ grep opcodes -A10 /sys/kernel/debug/spi-nor/spi0.0/params
opcodes
 read		0xec
  dummy cycles	6
 erase		0xdc
 program	0x34
 SR1 read	0x05
 SR2 read	0x35
 SR1+SR2 write	0x01
 QE		SR2 bit 1
 8D extension	none

Signed-off-by: Miquel Raynal <[email protected]>
---
 drivers/mtd/spi-nor/debugfs.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/mtd/spi-nor/debugfs.c b/drivers/mtd/spi-nor/debugfs.c
index 275671222588..a82858f0328a 100644
--- a/drivers/mtd/spi-nor/debugfs.c
+++ b/drivers/mtd/spi-nor/debugfs.c
@@ -105,6 +105,21 @@ static int spi_nor_params_show(struct seq_file *s, void *data)
 	seq_printf(s, "  dummy cycles\t%u\n", nor->read_dummy);
 	seq_printf(s, " erase\t\t0x%02x\n", nor->erase_opcode);
 	seq_printf(s, " program\t0x%02x\n", nor->program_opcode);
+	seq_printf(s, " SR1 read\t0x%02x\n", params->opcodes.read_sr1);
+	if (params->opcodes.read_sr2)
+		seq_printf(s, " SR2 read\t0x%02x\n", params->opcodes.read_sr2);
+	if (params->opcodes.write_sr1)
+		seq_printf(s, " SR1 write\t0x%02x\n", params->opcodes.write_sr1);
+	if (params->opcodes.write_sr2)
+		seq_printf(s, " SR2 write\t0x%02x\n", params->opcodes.write_sr2);
+	if (params->opcodes.write_sr1_and_sr2)
+		seq_printf(s, " SR1+SR2 write\t0x%02x\n",
+			   params->opcodes.write_sr1_and_sr2);
+
+	if (params->qe_mask[0] || params->qe_mask[1])
+		seq_printf(s, " QE\t\tSR%d bit %d\n",
+			   params->qe_mask[0] ? 1 : 2,
+			   ffs(params->qe_mask[0] | params->qe_mask[1]) - 1);
 
 	switch (nor->cmd_ext_type) {
 	case SPI_NOR_EXT_NONE:

-- 
2.54.0