The patch titled
Documentation/ABI: /sys/class/gpio
has been added to the -mm tree. Its filename is
documentation-abi-sys-class-gpio.patch
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------------------------------------------------------
Subject: Documentation/ABI: /sys/class/gpio
From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Provide summary ABI docs about the /sys/class/gpio files.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-gpio | 26 +++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff -puN /dev/null Documentation/ABI/testing/sysfs-gpio
--- /dev/null
+++ a/Documentation/ABI/testing/sysfs-gpio
@@ -0,0 +1,26 @@
+What: /sys/class/gpio/
+Date: July 2008
+KernelVersion: 2.6.27
+Contact: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
+Description:
+
+ As a Kconfig option, individual GPIO signals may be accessed from
+ userspace. GPIOs are only made available to userspace by an explicit
+ "export" operation. If a given GPIO is not claimed for use by
+ kernel code, it may be exported by userspace (and unexported later).
+ Kernel code may export it for complete or partial access.
+
+ GPIOs are identified as they are inside the kernel, using integers in
+ the range 0..INT_MAX. See Documentation/gpio.txt for more information.
+
+ /sys/class/gpio
+ /export ... asks the kernel to export a GPIO to userspace
+ /unexport ... to return a GPIO to the kernel
+ /gpioN ... for each exported GPIO #N
+ /value ... always readable, writes fail for input GPIOs
+ /direction ... r/w as: in, out (default low); write: high, low
+ /gpiochipN ... for each gpiochip; #N is its first GPIO
+ /base ... (r/o) same as N
+ /label ... (r/o) descriptive, not necessarily unique
+ /ngpio ... (r/o) number of GPIOs; numbered N to N + (ngpio - 1)
+
_
Patches currently in -mm which might be from dbrownell@xxxxxxxxxxxxxxxxxxxxx are
origin.patch
spi_mpc83xx-fix-clockrate-calculation-for-low-speed.patch
spi_mpc83xx-reject-invalid-transfer-sizes.patch
pxa2xx_spi-chipselect-bugfixes.patch
pxa2xx_spi-dma-bugfixes.patch
documentation-abi-sys-class-gpio.patch
linux-next.patch
spi-simplify-spi_write_then_read.patch
spi_s3c24xx-pin-configuration-updates.patch
pxa2xx_spi-minor-cleanup.patch
pxa2xx_spi-fix-chip_info-defaults-and-documentation.patch
rtc-ds1307-alarm-support-for-ds1337-ds1339.patch
rtc-remove-some-nop-open-release-methods.patch
legacy-rtc-remove-needless-confusing-hpet_rtc_irq-option.patch
rtc-file-close-consistently-disables-repeating-irqs.patch
rtc-cmos-strongly-avoid-hpet-emulation.patch
make-gpiochip-label-const.patch
genirq-record-trigger-type.patch
genirq-record-trigger-type-fix.patch
irq-warn-about-irqf_disabledirqf_shared.patch
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