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authorLaurent Pinchart <laurentp@cse-semaphore.com>2008-07-24 20:36:37 +0400
committerKumar Gala <galak@kernel.crashing.org>2008-07-28 16:48:04 +0400
commit7485d26b7e13ee8ff82adb271ac90a996c1fe830 (patch)
tree13bc7e6f30aa6cfb039e780b597f264eccf9d3df /Documentation/powerpc
parentdc2380ec8572fcd7f7e9579afc9fb223300d922f (diff)
downloadlinux-7485d26b7e13ee8ff82adb271ac90a996c1fe830.tar.xz
cpm_uart: Modem control lines support
This patch replaces the get_mctrl/set_mctrl stubs with modem control line read/write access through the GPIO lib. Available modem control lines are described in the device tree using GPIO bindings. The driver expect a GPIO pin for each of the CTS, RTS, DCD, DSR, DTR and RI signals. Unused control lines can be left out. Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/dts-bindings/fsl/cpm_qe/serial.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/powerpc/dts-bindings/fsl/cpm_qe/serial.txt b/Documentation/powerpc/dts-bindings/fsl/cpm_qe/serial.txt
index b35f3482e3e4..2ea76d9d137c 100644
--- a/Documentation/powerpc/dts-bindings/fsl/cpm_qe/serial.txt
+++ b/Documentation/powerpc/dts-bindings/fsl/cpm_qe/serial.txt
@@ -7,6 +7,15 @@ Currently defined compatibles:
- fsl,cpm2-scc-uart
- fsl,qe-uart
+Modem control lines connected to GPIO controllers are listed in the gpios
+property as described in booting-without-of.txt, section IX.1 in the following
+order:
+
+CTS, RTS, DCD, DSR, DTR, and RI.
+
+The gpios property is optional and can be left out when control lines are
+not used.
+
Example:
serial@11a00 {
@@ -18,4 +27,6 @@ Example:
interrupt-parent = <&PIC>;
fsl,cpm-brg = <1>;
fsl,cpm-command = <00800000>;
+ gpios = <&gpio_c 15 0
+ &gpio_d 29 0>;
};