Messages in this thread | | | Date | Sun, 20 Feb 2022 10:54:33 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH AUTOSEL 4.19 03/11] irqchip/sifive-plic: Add missing thead,c900-plic match string |
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Hi!
> [ Upstream commit 1d4df649cbb4b26d19bea38ecff4b65b10a1bbca ] > > The thead,c900-plic has been used in opensbi to distinguish > PLIC [1]. Although PLICs have the same behaviors in Linux, > they are different hardware with some custom initializing in > firmware(opensbi). > > Qute opensbi patch commit-msg by Samuel: > > The T-HEAD PLIC implementation requires setting a delegation bit > to allow access from S-mode. Now that the T-HEAD PLIC has its own > compatible string, set this bit automatically from the PLIC driver, > instead of reaching into the PLIC's MMIO space from another driver. > > [1]: https://github.com/riscv-software-src/opensbi/commit/78c2b19218bd62653b9fb31623a42ced45f38ea6 >
The "thead,c900-plic" string is added into single place in the kernel. This means that a) it will probably not do anything useful in -stable kernels and b) it is certainly missing documentation etc.
In mainline, string is documented in Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
Best regards, Pavel -- http://www.livejournal.com/~pavelmachek [unhandled content-type:application/pgp-signature] | |