another (i suspect) fairly simple question, i've just never had the occasion
to mess around in this part of the code.
if i have a device tree source file containing the snippet:
slave0: slave0-fubar@90000000 {
compatible = "simple-bus";
ranges = <0x0 0x90000000 0x10000000>;
#address-cells = <1>;
#size-cells = <1>;
};
slave1: slave1-fubar@a0000000 {
compatible = "simple-bus";
ranges = <0x0 0xa0000000 0x10000000>;
#address-cells = <1>;
#size-cells = <1>;
};
those two ranges actually represent physical addresses within
an FPGA and, when certain events occur, i want some driver code to
read/write some registers in slave0's address space, so obviously
i'll need to access that device tree entry and effectively ioremap()
slave0's physical address to a usable virtual address.
is there a canonical way to do this? short of manually extracting
the appropriate device tree node and reading that property and calling
ioremap()? is there a wrapper for that sort of operation, which i
imagine must be fairly common?
oh, and a pointer to a good example in the current kernel source
would, of course, be useful.
rday
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