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Diffstat (limited to 'Documentation/ABI/testing/sysfs-platform-i2c-demux-pinctrl')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-platform-i2c-demux-pinctrl | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-platform-i2c-demux-pinctrl b/Documentation/ABI/testing/sysfs-platform-i2c-demux-pinctrl new file mode 100644 index 000000000000..7ac7d7262bb7 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-i2c-demux-pinctrl @@ -0,0 +1,23 @@ +What: /sys/devices/platform/<i2c-demux-name>/cur_master +Date: January 2016 +KernelVersion: 4.6 +Contact: Wolfram Sang <wsa@the-dreams.de> +Description: + +This file selects the active I2C master for a demultiplexed bus. + +Write 0 there for the first master, 1 for the second etc. Reading the file will +give you a list with the active master marked. Example from a Renesas Lager +board: + +root@Lager:~# cat /sys/devices/platform/i2c@8/cur_master +* 0 - /i2c@9 + 1 - /i2c@e6520000 + 2 - /i2c@e6530000 + +root@Lager:~# echo 2 > /sys/devices/platform/i2c@8/cur_master + +root@Lager:~# cat /sys/devices/platform/i2c@8/cur_master + 0 - /i2c@9 + 1 - /i2c@e6520000 +* 2 - /i2c@e6530000 |