Re: PCIE device tree bindings - Could you help me to understand?

Hi Murali,

On Wed, Mar 6, 2013 at 11:37 PM, Murali Karicheri [off-list ref] wrote:

Hello All,

I am working to develop a PCIE driver that requires DT bindings. Could
someone point me to a documentation or code or explain how to interpret the
following device tree bindings. I understand the reg property only. There is
outbound PCIE memory and inbound PCIE memory. But can't understand the below
bindings for the same. Also how the interrupt mapping works? Below dts

Refer the following links [1] [2] it gives the good explanation for
your above query.

[1] http://devicetree.org/Device_Tree_Usage#PCI_Host_Bridge
[2] http://devicetree.org/MPC5200:PCI

Regards,
--Prabhakar Lad

bindings is copied from powerpc/boot/dts/ep405.dts. Surprisingly I am not
seeing any example pcie bindings on ARM architecture even though there PCI
or PCIE drivers available on ARM. Your help is appreciated.

                PCI0: pci@ec000000 {
                        device_type = "pci";
                        #interrupt-cells = <1>;
                        #size-cells = <2>;
                        #address-cells = <3>;
                        compatible = "ibm,plb405gp-pci", "ibm,plb-pci";
                        primary;
                        reg = <0xeec00000 0x00000008    /* Config space
access */
                               0xeed80000 0x00000004    /* IACK */
                               0xeed80000 0x00000004    /* Special cycle */
                               0xef480000 0x00000040>;  /* 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 = <0x02000000 0x00000000 0x80000000
0x80000000 0x00000000 0x20000000
                                  0x01000000 0x00000000 0x00000000
0xe8000000 0x00000000 0x00010000>;

                        /* Inbound 2GB range starting at 0 */
                        dma-ranges = <0x42000000 0x0 0x0 0x0 0x0
0x80000000>;

                        /* That's all I know about IRQs on that thing ... */
                        interrupt-map-mask = <0xf800 0x0 0x0 0x0>;
                        interrupt-map = <
                                /* USB */
                                0x7000 0x0 0x0 0x0 &UIC0 0x1e 0x8 /* IRQ5 */
                        >;
                };


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