Messages in this thread | | | From | Arnd Bergmann <> | Date | Wed, 16 Sep 2020 13:02:24 +0200 | Subject | Re: [PATCH V4 2/2] dt-bindings: mailbox: add doorbell support to ARM MHU |
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On Wed, Sep 16, 2020 at 11:39 AM Viresh Kumar <viresh.kumar@linaro.org> wrote: > > From: Sudeep Holla <sudeep.holla@arm.com> > > The ARM MHU's reference manual states following: > > "The MHU drives the signal using a 32-bit register, with all 32 bits > logically ORed together. The MHU provides a set of registers to enable > software to set, clear, and check the status of each of the bits of this > register independently. The use of 32 bits for each interrupt line > enables software to provide more information about the source of the > interrupt. For example, each bit of the register can be associated with > a type of event that can contribute to raising the interrupt." > > This patch thus extends the MHU controller's DT binding to add support > for doorbell mode. > > Though the same MHU hardware controller is used in the two modes, A new > compatible string is added here to represent the combination of the MHU > hardware and the firmware sitting on the other side (which expects each > bit to represent a different signal now). > > Reviewed-by: Rob Herring <robh@kernel.org> > Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> > Co-developed-by: Viresh Kumar <viresh.kumar@linaro.org> > Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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