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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
bindings: update imx and mxs #gpio-cells
The of_get_named_gpio_flags can retrieve the second cell of
gpio-specifier as the "flags". The imx and mxs gpio driver do not
have their own .xlate callback, which means of_gpio_simple_xlate is
used and it's a 1:1 mapping between gpio controller flags and Linux
"enum of_gpio_flags".
Update imx and mxs bindings document to make it clear.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
+6
-4
+3
-2
Documentation/devicetree/bindings/gpio/fsl-imx-gpio.txt
+3
-2
Documentation/devicetree/bindings/gpio/fsl-imx-gpio.txt
···
8
8
by low 16 pins and the second one is for high 16 pins.
9
9
- gpio-controller : Marks the device node as a gpio controller.
10
10
- #gpio-cells : Should be two. The first cell is the pin number and
11
-
the second cell is used to specify optional parameters (currently
12
-
unused).
11
+
the second cell is used to specify the gpio polarity:
12
+
0 = active high
13
+
1 = active low
13
14
14
15
Example:
15
16
+3
-2
Documentation/devicetree/bindings/gpio/gpio-mxs.txt
+3
-2
Documentation/devicetree/bindings/gpio/gpio-mxs.txt
···
13
13
- interrupts : Should be the port interrupt shared by all 32 pins.
14
14
- gpio-controller : Marks the device node as a gpio controller.
15
15
- #gpio-cells : Should be two. The first cell is the pin number and
16
-
the second cell is used to specify optional parameters (currently
17
-
unused).
16
+
the second cell is used to specify the gpio polarity:
17
+
0 = active high
18
+
1 = active low
18
19
- interrupt-controller: Marks the device node as an interrupt controller.
19
20
- #interrupt-cells : Should be 2. The first cell is the GPIO number.
20
21
The second cell bits[3:0] is used to specify trigger type and level flags: