Okay ... I have made some progress, but it's not ideal.
Currently I've hacked the GPMC DT driver (gpmc_probe_dt(), etc) so it now handles setting up the
chip selects and timings for NOR devices, e.g.
gpmc: gpmc@50000000 {
status = "okay";
ranges = <0 0 0x08000000 0x08000000>; /* CS0: NOR 16M */
nor@0,0 {
compatible = "spansion,s29gl064n90t", "cfi-flash";
reg = <0 0 0>;
bank-width = <2>;
gpmc,sync-clk = <0>;
gpmc,cs-on = <10>;
gpmc,cs-rd-off = <150>;
gpmc,cs-wr-off = <150>;
gpmc,adv-on = <10>;
gpmc,adv-rd-off = <10>;
gpmc,adv-wr-off = <10>;
gpmc,oe-on = <30>;
gpmc,oe-off = <150>;
gpmc,we-on = <30>;
gpmc,we-off = <150>;
gpmc,rd-cycle = <150>;
gpmc,wr-cycle = <150>;
gpmc,access = <130>;
gpmc,page-burst-access = <10>;
gpmc,cycle2cycle-diff = <1>;
gpmc,cycle2cycle-same = <1>;
gpmc,cycle2cycle-delay = <10>;
gpmc,wr-data-mux-bus = <60>;
};
};
But the physmap driver (of_flash_probe()) is unable to use this information. It seems that although
I can call of_flash_probe() from my NOR setup code, the platform_device being reference is wrong.
The platform_device passed to my gpmc_probe_nor_child() routine from gpmc_probe_dt() points to my
gpmc entry (above), but the physmap probe requires its own DT entry (rather than a node child such
as my NOR entry with the GPMC device entry).
So I need to have any extra entry in the DT file as follows:-
nor-flash@08000000 {
compatible = "spansion,s29gl064n90t", "cfi-flash";
reg = <0x08000000 0x00800000>;
bank-width = <2>;
};
So the GPMC entry handles all the chip select and timing setup, but the 2nd entry is the only one
the physmap driver can see.
Would it be acceptable to re-code of_flash_probe() to allow either a child device_node to be passed
or a platform_device ?
Cheers
Mark J.
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