diff options
Diffstat (limited to 'target/linux/generic/patches-3.8/033-backport-spi-of-Use-DT-aliases-for-assigning-bus-number.patch')
| -rw-r--r-- | target/linux/generic/patches-3.8/033-backport-spi-of-Use-DT-aliases-for-assigning-bus-number.patch | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/target/linux/generic/patches-3.8/033-backport-spi-of-Use-DT-aliases-for-assigning-bus-number.patch b/target/linux/generic/patches-3.8/033-backport-spi-of-Use-DT-aliases-for-assigning-bus-number.patch deleted file mode 100644 index 02a2eca179..0000000000 --- a/target/linux/generic/patches-3.8/033-backport-spi-of-Use-DT-aliases-for-assigning-bus-number.patch +++ /dev/null @@ -1,37 +0,0 @@ -From bb29785e0d6d150181704be2efcc3141044625e2 Mon Sep 17 00:00:00 2001 -From: Grant Likely <grant.likely@secretlab.ca> -Date: Fri, 21 Dec 2012 19:32:09 +0000 -Subject: [PATCH] spi/of: Use DT aliases for assigning bus number - -Linux assigns a number to each spi_master in the system, but when the -platform used the device tree, the numbers are dynamically assigned and -are not predictable. In general this shouldn't matter since the kernel -doesn't use the bus number for anything other than matching a bus to -spi_boardinfo (not used for DT). However, sometimes userspace needs to -figure out which bus is which, so it makes sense to use the global -/aliases namespace to choose a specific bus number. - -It is safe to derive the bus number from an alias because aliases will -never cause two buses to try and use the same bus number. (At one time -the cell-index property was used for this purpose, but cell-index has -the risk of an id collision). - -Signed-off-by: Grant Likely <grant.likely@secretlab.ca> -Cc: Anatolij Gustschin <agust@denx.de> -Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> ---- - drivers/spi/spi.c | 3 +++ - 1 file changed, 3 insertions(+) - ---- a/drivers/spi/spi.c -+++ b/drivers/spi/spi.c -@@ -1135,6 +1135,9 @@ int spi_register_master(struct spi_maste - if (master->num_chipselect == 0) - return -EINVAL; - -+ if ((master->bus_num < 0) && master->dev.of_node) -+ master->bus_num = of_alias_get_id(master->dev.of_node, "spi"); -+ - /* convention: dynamically assigned bus IDs count down from the max */ - if (master->bus_num < 0) { - /* FIXME switch to an IDR based scheme, something like |