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SubjectRe: [PATCH V9 2/2] mailbox: introduce ARM SMC based mailbox

On 9/24/2019 7:09 PM, Peng Fan wrote:
> From: Peng Fan <>
> This mailbox driver implements a mailbox which signals transmitted data
> via an ARM smc (secure monitor call) instruction. The mailbox receiver
> is implemented in firmware and can synchronously return data when it
> returns execution to the non-secure world again.
> An asynchronous receive path is not implemented.
> This allows the usage of a mailbox to trigger firmware actions on SoCs
> which either don't have a separate management processor or on which such
> a core is not available. A user of this mailbox could be the SCP
> interface.
> Modified from Andre Przywara's v2 patch
> Cc: Andre Przywara <>
> Signed-off-by: Peng Fan <>

Reviewed-by: Florian Fainelli <>

Thanks for your persistence working on this!

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