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authorGrant Likely <grant.likely@secretlab.ca>2010-06-08 07:48:19 -0600
committerGrant Likely <grant.likely@secretlab.ca>2010-07-05 16:14:52 -0600
commit2ffe8c5f323c3b9749bf7bc2375d909d20bdbb15 (patch)
treeffbaba1c737fa5da32d9c1a503e58d2896f10be6 /drivers/of
parent959e85f7751c33d1a2dabc5cc3fe2ed0db7052e5 (diff)
downloadlinux-2ffe8c5f323c3b9749bf7bc2375d909d20bdbb15.tar.bz2
of: refactor of_modalias_node() and remove explicit match table.
This patch tightens up the behaviour of of_modalias_node() to be more predicatable and to eliminate the explicit of_modalias_tablep[] that is currently used to override the first entry in the compatible list of a device. The override table was needed originally because spi and i2c drivers had no way to do of-style matching. Now that all devices can have an of_node pointer, and all drivers can have an of_match_table, the explicit override table is no longer needed because each driver can specify its own OF-style match data. The mpc8349emitx-mcu driver is modified to explicitly specify the correct device to bind against. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/base.c64
1 files changed, 9 insertions, 55 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index b5ad9740d8b2..e3f7af882e45 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -545,74 +545,28 @@ struct device_node *of_find_matching_node(struct device_node *from,
EXPORT_SYMBOL(of_find_matching_node);
/**
- * of_modalias_table: Table of explicit compatible ==> modalias mappings
- *
- * This table allows particulare compatible property values to be mapped
- * to modalias strings. This is useful for busses which do not directly
- * understand the OF device tree but are populated based on data contained
- * within the device tree. SPI and I2C are the two current users of this
- * table.
- *
- * In most cases, devices do not need to be listed in this table because
- * the modalias value can be derived directly from the compatible table.
- * However, if for any reason a value cannot be derived, then this table
- * provides a method to override the implicit derivation.
- *
- * At the moment, a single table is used for all bus types because it is
- * assumed that the data size is small and that the compatible values
- * should already be distinct enough to differentiate between SPI, I2C
- * and other devices.
- */
-struct of_modalias_table {
- char *of_device;
- char *modalias;
-};
-static struct of_modalias_table of_modalias_table[] = {
- { "fsl,mcu-mpc8349emitx", "mcu-mpc8349emitx" },
- { "mmc-spi-slot", "mmc_spi" },
-};
-
-/**
* of_modalias_node - Lookup appropriate modalias for a device node
* @node: pointer to a device tree node
* @modalias: Pointer to buffer that modalias value will be copied into
* @len: Length of modalias value
*
- * Based on the value of the compatible property, this routine will determine
- * an appropriate modalias value for a particular device tree node. Two
- * separate methods are attempted to derive a modalias value.
+ * Based on the value of the compatible property, this routine will attempt
+ * to choose an appropriate modalias value for a particular device tree node.
+ * It does this by stripping the manufacturer prefix (as delimited by a ',')
+ * from the first entry in the compatible list property.
*
- * First method is to lookup the compatible value in of_modalias_table.
- * Second is to strip off the manufacturer prefix from the first
- * compatible entry and use the remainder as modalias
- *
- * This routine returns 0 on success
+ * This routine returns 0 on success, <0 on failure.
*/
int of_modalias_node(struct device_node *node, char *modalias, int len)
{
- int i, cplen;
- const char *compatible;
- const char *p;
-
- /* 1. search for exception list entry */
- for (i = 0; i < ARRAY_SIZE(of_modalias_table); i++) {
- compatible = of_modalias_table[i].of_device;
- if (!of_device_is_compatible(node, compatible))
- continue;
- strlcpy(modalias, of_modalias_table[i].modalias, len);
- return 0;
- }
+ const char *compatible, *p;
+ int cplen;
compatible = of_get_property(node, "compatible", &cplen);
- if (!compatible)
+ if (!compatible || strlen(compatible) > cplen)
return -ENODEV;
-
- /* 2. take first compatible entry and strip manufacturer */
p = strchr(compatible, ',');
- if (!p)
- return -ENODEV;
- p++;
- strlcpy(modalias, p, len);
+ strlcpy(modalias, p ? p + 1 : compatible, len);
return 0;
}
EXPORT_SYMBOL_GPL(of_modalias_node);