how to loop over multiple registers in linux device tree node?

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how to loop over multiple registers in linux device tree node?



I implemented a generic driver, in the driver I just want to go over each registered device and do something.

my driver is generic so I don't want to know anything in advance about the devices.



I have some device tree nodes:


uart0: uart@1000000
compatible = "generic-driver";
reg = <0x1000000 0x1000>,<0x1001000 0x1000>,<0x1002000 0x1000>;
;

uart1: uart@2000000
compatible = "generic-driver";
reg = <0x2000000 0x1000>,<0x2001000 0x1000>,<0x2002000 0x1000>;
;



in the driver I know how to get first offset and size with platform_get_resource, but what if I have multiple ranges?

I saw an option to get it by add reg-names:


reg = <0x2000000 0x1000>,<0x2001000 0x1000>,<0x2002000 0x1000>;
reg-names = "uart0_0","urat0_1","uart0_2";



so in the driver I can use platform_get_resource_byname, but there I need to know in the driver the regs names in advance - but it'll be no more generic - unwanted!!



so my question is, is there a way to loop over these regs without early information in the driver?



Thanks in advance!!





How you are supposed to write a “generic” stuff for different hardware?! You need to know what tho hardware is and what the resources driver is expecting.
– 0andriy
Aug 15 at 17:13





I want to implement a "generic" driver because of it fits my needs. I want ONE driver that will do same work for each registered device. I don't think you're right.
– Tirtsah Dreyfus
Aug 16 at 18:08






There’s no universal or the driver. You’re conceptually wrong.
– 0andriy
Aug 17 at 12:07




1 Answer
1



If you go through the definition for platform_get_resource you will find that the last parameter is the resource number. So, for the example you gave resource numbers will range from 0 to 2.


platform_get_resource



In case you don't know the number of resource then you can run an loop till you get a NULL as response to platform_get_resource.


NULL


platform_get_resource






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