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authorLaurent Pinchart <laurentp@cse-semaphore.com>2008-05-26 11:53:21 +0200
committerJeff Garzik <jgarzik@redhat.com>2008-05-30 22:18:25 -0400
commita5edeccb1a8432ae5d9fb9bccea5a4b64c565017 (patch)
treed55dfa3802a65d3a3372f3487fb42b8495f96f2c /Documentation/powerpc
parent62c78329581e76347e1078b8ea996b603be3efec (diff)
net: OpenFirmware GPIO based MDIO bitbang driver
This patch adds an MDIO bitbang driver that uses the GPIO library and its OF bindings to access the bus I/Os. Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/booting-without-of.txt21
1 files changed, 21 insertions, 0 deletions
diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index 1d2a772506cf..46a9dba11f2f 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -58,6 +58,7 @@ Table of Contents
o) Xilinx IP cores
p) Freescale Synchronous Serial Interface
q) USB EHCI controllers
+ r) MDIO on GPIOs
VII - Marvell Discovery mv64[345]6x System Controller chips
1) The /system-controller node
@@ -2870,6 +2871,26 @@ platforms are moved over to use the flattened-device-tree model.
reg = <0xe8000000 32>;
};
+ r) MDIO on GPIOs
+
+ Currently defined compatibles:
+ - virtual,gpio-mdio
+
+ MDC and MDIO lines connected to GPIO controllers are listed in the
+ gpios property as described in section VIII.1 in the following order:
+
+ MDC, MDIO.
+
+ Example:
+
+ mdio {
+ compatible = "virtual,mdio-gpio";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ gpios = <&qe_pio_a 11
+ &qe_pio_c 6>;
+ };
+
VII - Marvell Discovery mv64[345]6x System Controller chips
===========================================================