mtd: m25p80: allow arbitrary OF matching for "jedec,spi-nor"
When we added the "jedec,spi-nor" compatible string for use in this
driver, we added it as a modalias option. The modalias can be derived in
different ways for platform devices vs. device tree (of_*) matching. But
for device tree matching (the primary target of this identifier string),
the modalias is determined from the first entry in the 'compatible'
property. IOW, the following properties would bind to this driver:
// Option (a), modalias = "spi-nor"
compatible = "jedec,spi-nor";
// Option (b), modalias = "spi-nor"
compatible = "idontknowwhatimdoing,spi-nor";
But the following would not:
// Option (c), modalias = "shinynewdevice"
compatible = "myvendor,shinynewdevice", "jedec,spi-nor";
So, we'd like to match (a) and (c) (even when we don't have an explicit
entry for "shinynewdevice"), and we'd rather not allow (b).
To do this, we
(1) always (for devices without specific platform data) pass the
modalias to the spi-nor library;
(2) rework the spi-nor library to not reject "bad" names, and
instead just fall back to autodetection; and
(3) add the .of_match_table to properly catch all "jedec,spi-nor".
This allows (a) and (c) without warnings, and rejects (b).
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index d313f948b..9cd3631 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -223,8 +223,6 @@
*/
if (data && data->type)
flash_name = data->type;
- else if (!strcmp(spi->modalias, "spi-nor"))
- flash_name = NULL; /* auto-detect */
else
flash_name = spi->modalias;
@@ -289,19 +287,25 @@
{"m25p40-nonjedec"}, {"m25p80-nonjedec"}, {"m25p16-nonjedec"},
{"m25p32-nonjedec"}, {"m25p64-nonjedec"}, {"m25p128-nonjedec"},
- /*
- * Generic support for SPI NOR that can be identified by the JEDEC READ
- * ID opcode (0x9F). Use this, if possible.
- */
- {"spi-nor"},
{ },
};
MODULE_DEVICE_TABLE(spi, m25p_ids);
+static const struct of_device_id m25p_of_table[] = {
+ /*
+ * Generic compatibility for SPI NOR that can be identified by the
+ * JEDEC READ ID opcode (0x9F). Use this, if possible.
+ */
+ { .compatible = "jedec,spi-nor" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, m25p_of_table);
+
static struct spi_driver m25p80_driver = {
.driver = {
.name = "m25p80",
.owner = THIS_MODULE,
+ .of_match_table = m25p_of_table,
},
.id_table = m25p_ids,
.probe = m25p_probe,