powerpc: Document Freescale power management nodes, and the sleep property.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 100 insertions, 42 deletions

diff --git a/Documentation/powerpc/booting-without-of.txt b/Documentation/powerpc/booting-without-of.txt
index de2e5c05d6e7..07ae2edff7c4 100644
--- a/Documentation/powerpc/booting-without-of.txt
+++ b/Documentation/powerpc/booting-without-of.txt
@@ -77,10 +77,12 @@ Table of Contents
     3) OpenPIC Interrupt Controllers
     4) ISA Interrupt Controllers
 
-  VIII - Specifying GPIO information for devices
+  IX - Specifying GPIO information for devices
     1) gpios property
     2) gpio-controller nodes
 
+  X - Specifying device power management information (sleep property)
+
   Appendix A - Sample SOC node for MPC8540
 
 
@@ -2422,8 +2424,8 @@ encodings listed below:
         2 =  high to low edge sensitive type enabled
         3 =  low to high edge sensitive type enabled
 
-VIII - Specifying GPIO information for devices
-==============================================
+IX - Specifying GPIO information for devices
+============================================
 
 1) gpios property
 -----------------
@@ -2471,6 +2473,37 @@ Example of two SOC GPIO banks defined as gpio-controller nodes:
                 gpio-controller;
         };
 
+X - Specifying Device Power Management Information (sleep property)
+===================================================================
+
+Devices on SOCs often have mechanisms for placing devices into low-power
+states that are decoupled from the devices' own register blocks.  Sometimes,
+this information is more complicated than a cell-index property can
+reasonably describe.  Thus, each device controlled in such a manner
+may contain a "sleep" property which describes these connections.
+
+The sleep property consists of one or more sleep resources, each of
+which consists of a phandle to a sleep controller, followed by a
+controller-specific sleep specifier of zero or more cells.
+
+The semantics of what type of low power modes are possible are defined
+by the sleep controller.  Some examples of the types of low power modes
+that may be supported are:
+
+ - Dynamic: The device may be disabled or enabled at any time.
+ - System Suspend: The device may request to be disabled or remain
+   awake during system suspend, but will not be disabled until then.
+ - Permanent: The device is disabled permanently (until the next hard
+   reset).
+
+Some devices may share a clock domain with each other, such that they should
+only be suspended when none of the devices are in use.  Where reasonable,
+such nodes should be placed on a virtual bus, where the bus has the sleep
+property.  If the clock domain is shared among devices that cannot be
+reasonably grouped in this manner, then create a virtual sleep controller
+(similar to an interrupt nexus, except that defining a standardized
+sleep-map should wait until its necessity is demonstrated).
+
 Appendix A - Sample SOC node for MPC8540
 ========================================
 
@@ -2487,47 +2520,48 @@ not necessary as they are usually the same as the root node.
                 reg = <e0000000 00003000>;
                 bus-frequency = <0>;
 
-                mdio@24520 {
-                        reg = <24520 20>;
-                        device_type = "mdio";
-                        compatible = "gianfar";
-
-                        ethernet-phy@0 {
-                                linux,phandle = <2452000>
-                                interrupt-parent = <40000>;
-                                interrupts = <35 1>;
-                                reg = <0>;
-                                device_type = "ethernet-phy";
-                        };
-
-                        ethernet-phy@1 {
-                                linux,phandle = <2452001>
-                                interrupt-parent = <40000>;
-                                interrupts = <35 1>;
-                                reg = <1>;
-                                device_type = "ethernet-phy";
-                        };
-
-                        ethernet-phy@3 {
-                                linux,phandle = <2452002>
-                                interrupt-parent = <40000>;
-                                interrupts = <35 1>;
-                                reg = <3>;
-                                device_type = "ethernet-phy";
-                        };
-
-                };
-
                 ethernet@24000 {
-                        #size-cells = <0>;
+                        #address-cells = <1>;
+                        #size-cells = <1>;
                         device_type = "network";
                         model = "TSEC";
-                        compatible = "gianfar";
+                        compatible = "gianfar", "simple-bus";
                         reg = <24000 1000>;
                         mac-address = [ 00 E0 0C 00 73 00 ];
                         interrupts = <d 3 e 3 12 3>;
                         interrupt-parent = <40000>;
                         phy-handle = <2452000>;
+                        sleep = <&pmc 00000080>;
+                        ranges;
+
+                        mdio@24520 {
+                                reg = <24520 20>;
+                                compatible = "fsl,gianfar-mdio";
+
+                                ethernet-phy@0 {
+                                        linux,phandle = <2452000>
+                                        interrupt-parent = <40000>;
+                                        interrupts = <35 1>;
+                                        reg = <0>;
+                                        device_type = "ethernet-phy";
+                                };
+
+                                ethernet-phy@1 {
+                                        linux,phandle = <2452001>
+                                        interrupt-parent = <40000>;
+                                        interrupts = <35 1>;
+                                        reg = <1>;
+                                        device_type = "ethernet-phy";
+                                };
+
+                                ethernet-phy@3 {
+                                        linux,phandle = <2452002>
+                                        interrupt-parent = <40000>;
+                                        interrupts = <35 1>;
+                                        reg = <3>;
+                                        device_type = "ethernet-phy";
+                                };
+                        };
                 };
 
                 ethernet@25000 {
@@ -2541,6 +2575,7 @@ not necessary as they are usually the same as the root node.
                         interrupts = <13 3 14 3 18 3>;
                         interrupt-parent = <40000>;
                         phy-handle = <2452001>;
+                        sleep = <&pmc 00000040>;
                 };
 
                 ethernet@26000 {
@@ -2554,15 +2589,33 @@ not necessary as they are usually the same as the root node.
                         interrupts = <19 3>;
                         interrupt-parent = <40000>;
                         phy-handle = <2452002>;
+                        sleep = <&pmc 00000020>;
                 };
 
                 serial@4500 {
-                        device_type = "serial";
-                        compatible = "ns16550";
-                        reg = <4500 100>;
-                        clock-frequency = <0>;
-                        interrupts = <1a 3>;
-                        interrupt-parent = <40000>;
+                        #address-cells = <1>;
+                        #size-cells = <1>;
+                        compatible = "fsl,mpc8540-duart", "simple-bus";
+                        sleep = <&pmc 00000002>;
+                        ranges;
+
+                        serial@4500 {
+                                device_type = "serial";
+                                compatible = "ns16550";
+                                reg = <4500 100>;
+                                clock-frequency = <0>;
+                                interrupts = <1a 3>;
+                                interrupt-parent = <40000>;
+                        };
+
+                        serial@4600 {
+                                device_type = "serial";
+                                compatible = "ns16550";
+                                reg = <4600 100>;
+                                clock-frequency = <0>;
+                                interrupts = <1a 3>;
+                                interrupt-parent = <40000>;
+                        };
                 };
 
                 pic@40000 {
@@ -2581,6 +2634,11 @@ not necessary as they are usually the same as the root node.
                         device_type = "i2c";
                         compatible  = "fsl-i2c";
                         dfsrr;
+                        sleep = <&pmc 00000004>;
                 };
 
+                pmc: power@e0070 {
+                        compatible = "fsl,mpc8540-pmc", "fsl,mpc8548-pmc";
+                        reg = <e0070 20>;
+                };
         };