powerpc/QE: implement support for the GPIO LIB API

This is needed to access QE GPIOs via Linux GPIO API.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-By: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index 8675ebca2cfd..b68684d39f96 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -1736,6 +1736,33 @@ platforms are moved over to use the flattened-device-tree model.
                         ......
                 };
 
+   Note that "par_io" nodes are obsolete, and should not be used for
+   the new device trees. Instead, each Par I/O bank should be represented
+   via its own gpio-controller node:
+
+   Required properties:
+   - #gpio-cells : should be "2".
+   - compatible : should be "fsl,<chip>-qe-pario-bank",
+     "fsl,mpc8323-qe-pario-bank".
+   - reg : offset to the register set and its length.
+   - gpio-controller : node to identify gpio controllers.
+
+   Example:
+        qe_pio_a: gpio-controller@1400 {
+                #gpio-cells = <2>;
+                compatible = "fsl,mpc8360-qe-pario-bank",
+                             "fsl,mpc8323-qe-pario-bank";
+                reg = <0x1400 0x18>;
+                gpio-controller;
+        };
+
+        qe_pio_e: gpio-controller@1460 {
+                #gpio-cells = <2>;
+                compatible = "fsl,mpc8360-qe-pario-bank",
+                             "fsl,mpc8323-qe-pario-bank";
+                reg = <0x1460 0x18>;
+                gpio-controller;
+        };
 
    vi) Pin configuration nodes