On Friday 16 May 2014 14:30:56 Kishon Vijay Abraham I wrote:

On Wednesday 14 May 2014 06:15 PM, Arnd Bergmann wrote:

quoted

On Wednesday 14 May 2014 11:14:45 Kishon Vijay Abraham I wrote:
/ {
      #address-cells = <1>; // or <2> if you support > 4GB address space
      #size-cells = <1>;

      soc {
              #address-cells <1>;
              #size-cells = <1>;
              ranges;
              dma-ranges;

              ... // all normal devices

              axi at 20000000 {
                      #size-cells = <1>;
                      #address-cells = <1>;
                      dma-ranges; // can access all 4GB outbound
                      ranges = <0 0x20000000 0x10000000>; // 28-bit bus

                      pci at 0 {
                              reg = <0x0    0x1000>, // internal regs
                                    <0x1000 0x2000>; // config space

The internal reg address space starts at 0x51000000. By Using this <0
0x20000000 0x10000000>; as ranges, we are not able to get the memory resource
properly. Can we use multiple ranges? how do we specify which ranges the *reg*
property to use?

Yes, multiple ranges will work fine. You can make up a representation
yourself if you don't know what the hardware really does.

Two possible ways of doing this would be

a)

	/* two separate physical connections represented as one logical bus */
	axi at 20000000 {
		#address-cells = <2>;
		#size-cells = <1>;
		ranges = <0 0 0x20000000 0x10000000>, /* configurable registers */
			 <1 0 0x51000000 0x01000000>; /* PCI host registers */

		pci at 1.0 {
			reg = <1 0 0x01000000>, /* host registers */
				<0 0x1000 0x2000>; /* config space */
		}

	};

b) 

	/* one physical bus, with some address munging */
	axi at 20000000 {
		#address-cells = <1>;
		#size-cells = <1>;
		ranges = <0 0x20000000 0x10000000>, /* configurable registers */
			 <0x51000000 0x51000000 0x01000000>; /* PCI host registers */

		pci at 1.0 {
			reg = <0x51000000 0x01000000>, /* host registers */
				<0x1000 0x2000>; /* config space */
		}

	};

Btw I was using *simple-bus* as compatible to *axi*. Or should I create a new
*axi* driver to create the pcie memory resources myself?

simple-bus is best here, since you don't have a complex bus that needs to
be set up using register accesses or that generates interrupts.

	Arnd