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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-08 06:35:17 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-08 06:35:17 +0900
commit1b033447bf847ba49c3816c564c9191c97456b36 (patch)
tree4b4b19649671a230a9071c8422a065766eb86a6f /Documentation
parentc0703c12ef6744b6d2565ec67a15aaf25d534abd (diff)
parentc415b303a704e5c5f766fc0404093910c36cc4ab (diff)
Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
Pull i2c updates from Jean Delvare: "Most visible changes are the SMBus multiplexing support added to the i2c-i801 driver, as well as support for the VIA VX900." * 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: i2c-piix4: Fix build failure i2c: Correct struct i2c_driver doc about detection i2c-i801: Let i2c-mux-gpio find the GPIO chip i2c-mux-gpio: Update documentation i2c-mux-gpio: Add support for dynamically allocated GPIO pins i2c-mux-gpio: Use devm_kzalloc instead of kzalloc i2c-i801: Support SMBus multiplexing on Asus Z8 series i2c-viapro: Add VIA VX900 device ID i2c-parport: i2c_parport_irq can be static i2c-designware: i2c_dw_xfer_msg can be static i2c/scx200_*: Replace printks with pr_<level>s i2c: Make I2C available on UML i2c: Convert struct i2c_msg initialization to C99 format i2c-smbus: Convert kzalloc to devm_kzalloc i2c-mux: Add support for device auto-detection
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/i2c/busses/i2c-viapro6
-rw-r--r--Documentation/i2c/muxes/i2c-mux-gpio18
2 files changed, 23 insertions, 1 deletions
diff --git a/Documentation/i2c/busses/i2c-viapro b/Documentation/i2c/busses/i2c-viapro
index 2e758b0e9456..b88f91ae580e 100644
--- a/Documentation/i2c/busses/i2c-viapro
+++ b/Documentation/i2c/busses/i2c-viapro
@@ -20,7 +20,10 @@ Supported adapters:
Datasheet: available on http://linux.via.com.tw
* VIA Technologies, Inc. VX855/VX875
- Datasheet: Availability unknown
+ Datasheet: available on http://linux.via.com.tw
+
+ * VIA Technologies, Inc. VX900
+ Datasheet: available on http://linux.via.com.tw
Authors:
Kyösti Mälkki <kmalkki@cc.hut.fi>,
@@ -57,6 +60,7 @@ Your lspci -n listing must show one of these :
device 1106:8324 (CX700)
device 1106:8353 (VX800/VX820)
device 1106:8409 (VX855/VX875)
+ device 1106:8410 (VX900)
If none of these show up, you should look in the BIOS for settings like
enable ACPI / SMBus or even USB.
diff --git a/Documentation/i2c/muxes/i2c-mux-gpio b/Documentation/i2c/muxes/i2c-mux-gpio
index bd9b2299b739..d4d91a53fc39 100644
--- a/Documentation/i2c/muxes/i2c-mux-gpio
+++ b/Documentation/i2c/muxes/i2c-mux-gpio
@@ -63,3 +63,21 @@ static struct platform_device myboard_i2cmux = {
.platform_data = &myboard_i2cmux_data,
},
};
+
+If you don't know the absolute GPIO pin numbers at registration time,
+you can instead provide a chip name (.chip_name) and relative GPIO pin
+numbers, and the i2c-gpio-mux driver will do the work for you,
+including deferred probing if the GPIO chip isn't immediately
+available.
+
+Device Registration
+-------------------
+
+When registering your i2c-gpio-mux device, you should pass the number
+of any GPIO pin it uses as the device ID. This guarantees that every
+instance has a different ID.
+
+Alternatively, if you don't need a stable device name, you can simply
+pass PLATFORM_DEVID_AUTO as the device ID, and the platform core will
+assign a dynamic ID to your device. If you do not know the absolute
+GPIO pin numbers at registration time, this is even the only option.