fbdev: Add GXT4000P and GXT6500P support to the gxt4500 driver

I'm reviving an old patch from 2009 that adds support for GXT4000P and GXT6500P
adapter to the gxt4500 driver.

See threads at http://marc.info/?l=linux-fbdev-devel&m=124345080216952&w=2
and https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-June/072672.html
for more details.

This patch adds support for GXT4000P and GXT6500P cards found on some
IBM pSeries machines.
GXT4000P/6000P and GXT4500P/6500P  couples are  identical from
software's point of view and are based on the same  Raster Engine
(RC1000), except for a different reference clock for the PLL.
GXT6x00P models are equipped with an additional Geometry Engine
(GT1000) but this driver doesn't use it.

Signed-off-by: Nico Macrionitis <acrux@cruxppc.org>
Signed-off-by: Giuseppe Coviello <cjg@cruxppc.org>
Tested-by: Dan Horák <dan@danny.cz>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index d08d7998a4aa..0cff083fbbe2 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -2140,14 +2140,16 @@ config FB_UDL
           To compile as a module, choose M here: the module name is udlfb.
 
 config FB_IBM_GXT4500
-        tristate "Framebuffer support for IBM GXT4500P adaptor"
+        tristate "Framebuffer support for IBM GXT4000P/4500P/6000P/6500P adaptors"
         depends on FB && PPC
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
         ---help---
-          Say Y here to enable support for the IBM GXT4500P display
-          adaptor, found on some IBM System P (pSeries) machines.
+          Say Y here to enable support for the IBM GXT4000P/6000P and
+          GXT4500P/6500P display adaptor based on Raster Engine RC1000,
+          found on some IBM System P (pSeries) machines. This driver
+          doesn't use Geometry Engine GT1000.
 
 config FB_PS3
         tristate "PS3 GPU framebuffer driver"