Re: [RFCv2 3/3] ARM: dts: N900: Add SSI information

Hi Tony,

On Wed, Nov 20, 2013 at 05:38:59PM -0800, Tony Lindgren wrote:

* Sebastian Reichel [off-list ref] [130915 13:56]:

quoted

+
+Example for Nokia N900:
+
+ssi-controller@48058000 {
+	compatible = "ti,omap3-ssi";
+	ti,hwmods = "ssi";
+
+	reg = <0x48058000 0x1000>,
+	      <0x48059000 0x1000>;
+	reg-names = "sys",
+		    "gdd";
+
+	interrupts = <55>;
+	interrupt-names = "gdd_mpu";
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+	ranges;
+
+	ssi-port@0 {
+		compatible = "ti,omap3-ssi-port";
+
+		reg = <0x4805a000 0x800>,
+		      <0x4805a800 0x800>;
+		reg-names = "tx",
+			    "rx";
+
+		interrupt-parent = <&intc>;
+		interrupts = <51>,
+			     <52>;
+		interrupt-names = "mpu_irq0",
+				  "mpu_irq1";
+
+		ti,ssi-cawake-gpio = <&gpio5 23 GPIO_ACTIVE_HIGH>; /* 151 */
+	}
+}

These should be in the omap3.dtsi file and not nested but separate. I'm almost
certain that these are completely independent hardware modules and this
means they can live their own PM life independently.

So can you please do a minimal patch for omap3.dtsi that just sets up
the standard resources separately for both modules the same way we have
for other hardware modules in omap3.dtsi do?

One of them should be called ssi, no idea what the other module name should
be as those register ranges show up as reserved in the docs I have.

In the public documentation of the omaps all SSI related stuff is
missing and memory areas are marked as reserved. I could not find
out how to receive the NDA version, so the following is purely
speculation based on the code.

If I understand it right the HW looks like this:

+-----------------+
|    GDD (DMA)    | <- this one is currently called ssi-controller
+--------+--------+
| Port 1 | Port 2 | <- these are currently called ssi-port
+--------+--------+

I think the GDD part must be enabled while Port 1 or Port 2 is
enabled. The last RFC driver from Carlos did not even split up the
irq/memory areas into different platform devices, but just requested
all of them in one ssi platform device.

The other binding pieces can be added later on as they get are ready.

Sure. They are almost finished btw. I was able to get a gsm network
scan.

-- Sebastian