android_kernel_motorola_sm6225/arch/powerpc/boot/dts/walnut.dts
David Gibson 22258fa40e [POWERPC] Enable RTC for Ebony and Walnut (v2)
This patch extends the Ebony and Walnut platform code to instantiate
the existing ds1742 RTC class driver for the DS1743 RTC/NVRAM chip
found on both those boards.  The patch uses a helper function to scan
the device tree and instantiate the appropriate platform_device based
on it, so it should be easy to extend for other boards which have mmio
mapped RTC chips.

Along with this, the device tree binding for the ds1743 chips is
tweaked, based on the existing DS1385 OF binding found at:
	http://playground.sun.com/1275/proposals/Closed/Remanded/Accepted/346-it.txt
Although that document covers the NVRAM portion of the chip, whereas
here we're interested in the RTC portion, so it's not entirely clear
if that's a good model.

This implements only RTC class driver support - that is /dev/rtc0, not
/dev/rtc, and the low-level get/set time callbacks remain
unimplemented.  That means in order to get at the clock you will
either need a modified version of hwclock which will look at
/dev/rtc0, or you'll need to configure udev to symlink rtc0 to rtc.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
2008-01-25 07:07:26 -06:00

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/*
* Device Tree Source for IBM Walnut
*
* Copyright 2007 IBM Corp.
* Josh Boyer <jwboyer@linux.vnet.ibm.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without
* any warranty of any kind, whether express or implied.
*/
/ {
#address-cells = <1>;
#size-cells = <1>;
model = "ibm,walnut";
compatible = "ibm,walnut";
dcr-parent = <&/cpus/cpu@0>;
aliases {
ethernet0 = &EMAC;
serial0 = &UART0;
serial1 = &UART1;
};
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
device_type = "cpu";
model = "PowerPC,405GP";
reg = <0>;
clock-frequency = <bebc200>; /* Filled in by zImage */
timebase-frequency = <0>; /* Filled in by zImage */
i-cache-line-size = <20>;
d-cache-line-size = <20>;
i-cache-size = <4000>;
d-cache-size = <4000>;
dcr-controller;
dcr-access-method = "native";
};
};
memory {
device_type = "memory";
reg = <0 0>; /* Filled in by zImage */
};
UIC0: interrupt-controller {
compatible = "ibm,uic";
interrupt-controller;
cell-index = <0>;
dcr-reg = <0c0 9>;
#address-cells = <0>;
#size-cells = <0>;
#interrupt-cells = <2>;
};
plb {
compatible = "ibm,plb3";
#address-cells = <1>;
#size-cells = <1>;
ranges;
clock-frequency = <0>; /* Filled in by zImage */
SDRAM0: memory-controller {
compatible = "ibm,sdram-405gp";
dcr-reg = <010 2>;
};
MAL: mcmal {
compatible = "ibm,mcmal-405gp", "ibm,mcmal";
dcr-reg = <180 62>;
num-tx-chans = <1>;
num-rx-chans = <1>;
interrupt-parent = <&UIC0>;
interrupts = <
b 4 /* TXEOB */
c 4 /* RXEOB */
a 4 /* SERR */
d 4 /* TXDE */
e 4 /* RXDE */>;
};
POB0: opb {
compatible = "ibm,opb-405gp", "ibm,opb";
#address-cells = <1>;
#size-cells = <1>;
ranges = <ef600000 ef600000 a00000>;
dcr-reg = <0a0 5>;
clock-frequency = <0>; /* Filled in by zImage */
UART0: serial@ef600300 {
device_type = "serial";
compatible = "ns16550";
reg = <ef600300 8>;
virtual-reg = <ef600300>;
clock-frequency = <0>; /* Filled in by zImage */
current-speed = <2580>;
interrupt-parent = <&UIC0>;
interrupts = <0 4>;
};
UART1: serial@ef600400 {
device_type = "serial";
compatible = "ns16550";
reg = <ef600400 8>;
virtual-reg = <ef600400>;
clock-frequency = <0>; /* Filled in by zImage */
current-speed = <2580>;
interrupt-parent = <&UIC0>;
interrupts = <1 4>;
};
IIC: i2c@ef600500 {
compatible = "ibm,iic-405gp", "ibm,iic";
reg = <ef600500 11>;
interrupt-parent = <&UIC0>;
interrupts = <2 4>;
};
GPIO: gpio@ef600700 {
compatible = "ibm,gpio-405gp";
reg = <ef600700 20>;
};
EMAC: ethernet@ef600800 {
linux,network-index = <0>;
device_type = "network";
compatible = "ibm,emac-405gp", "ibm,emac";
interrupt-parent = <&UIC0>;
interrupts = <
f 4 /* Ethernet */
9 4 /* Ethernet Wake Up */>;
local-mac-address = [000000000000]; /* Filled in by zImage */
reg = <ef600800 70>;
mal-device = <&MAL>;
mal-tx-channel = <0>;
mal-rx-channel = <0>;
cell-index = <0>;
max-frame-size = <5dc>;
rx-fifo-size = <1000>;
tx-fifo-size = <800>;
phy-mode = "rmii";
phy-map = <00000001>;
};
};
EBC0: ebc {
compatible = "ibm,ebc-405gp", "ibm,ebc";
dcr-reg = <012 2>;
#address-cells = <2>;
#size-cells = <1>;
/* The ranges property is supplied by the bootwrapper
* and is based on the firmware's configuration of the
* EBC bridge
*/
clock-frequency = <0>; /* Filled in by zImage */
sram@0,0 {
reg = <0 0 80000>;
};
flash@0,80000 {
compatible = "jedec-flash";
bank-width = <1>;
reg = <0 80000 80000>;
#address-cells = <1>;
#size-cells = <1>;
partition@0 {
label = "OpenBIOS";
reg = <0 80000>;
read-only;
};
};
nvram@1,0 {
/* NVRAM and RTC */
compatible = "ds1743-nvram";
#bytes = <2000>;
reg = <1 0 2000>;
};
keyboard@2,0 {
compatible = "intel,82C42PC";
reg = <2 0 2>;
};
ir@3,0 {
compatible = "ti,TIR2000PAG";
reg = <3 0 10>;
};
fpga@7,0 {
compatible = "Walnut-FPGA";
reg = <7 0 10>;
virtual-reg = <f0300005>;
};
};
PCI0: pci@ec000000 {
device_type = "pci";
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
compatible = "ibm,plb405gp-pci", "ibm,plb-pci";
primary;
reg = <eec00000 8 /* Config space access */
eed80000 4 /* IACK */
eed80000 4 /* Special cycle */
ef480000 40>; /* Internal registers */
/* Outbound ranges, one memory and one IO,
* later cannot be changed. Chip supports a second
* IO range but we don't use it for now
*/
ranges = <02000000 0 80000000 80000000 0 20000000
01000000 0 00000000 e8000000 0 00010000>;
/* Inbound 2GB range starting at 0 */
dma-ranges = <42000000 0 0 0 0 80000000>;
/* Walnut has all 4 IRQ pins tied together per slot */
interrupt-map-mask = <f800 0 0 0>;
interrupt-map = <
/* IDSEL 1 */
0800 0 0 0 &UIC0 1c 8
/* IDSEL 2 */
1000 0 0 0 &UIC0 1d 8
/* IDSEL 3 */
1800 0 0 0 &UIC0 1e 8
/* IDSEL 4 */
2000 0 0 0 &UIC0 1f 8
>;
};
};
chosen {
linux,stdout-path = "/plb/opb/serial@ef600300";
};
};