diff options
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r-- | drivers/of/base.c | 64 |
1 files changed, 9 insertions, 55 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index b5ad9740d8b..e3f7af882e4 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); |