forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[PATCH] SPI: busnum == 0 needs to work

Browse source 
We need to be able to have a "SPI bus 0" matching chip numbering; but
that number was wrongly used to flag dynamic allocation of a bus number.

This patch resolves that issue; now negative numbers trigger dynamic alloc.

It also updates the how-to-write-a-controller-driver overview to mention
this stuff.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2006-04-03 15:49:04 -07:00 • committed by Greg Kroah-Hartman
parent ccf77cc4af
commit a020ed7521
3 changed files with 38 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/spi/spi.h
View file

@ -172,13 +172,13 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
struct spi_master {
struct class_device cdev;
/* other than zero (== assign one dynamically), bus_num is fully
/* other than negative (== assign one dynamically), bus_num is fully
* board-specific. usually that simplifies to being SOC-specific.
* example: one SOC has three SPI controllers, numbered 1..3,
* example: one SOC has three SPI controllers, numbered 0..2,
* and one board's schematics might show it using SPI-2. software
* would normally use bus_num=2 for that controller.
*/
u16 bus_num;
s16 bus_num;
/* chipselects will be integral to many controllers; some others
* might use board-specific GPIOs.