Messages in this thread | | | Subject | Re: [PATCH v6 19/23] drivers/fsi: Add GPIO based FSI master | From | Jeremy Kerr <> | Date | Thu, 11 May 2017 09:58:16 +0800 |
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Hi Chris,
> I don't think we'd want this per master. The lock is for the 'top' > master issuing commands. Only the top master can initiate any > transactions on the bus to any devices connected downstream. Downstream > masters such as hub masters, etc... cannot initiate a command.
I think what Joel meant there was that we have it per *GPIO* master; if there are two GPIO masters on a system, there's no need to provide mutual exclusion to each (separate) set of GPIOs.
To implement this, we'd just move the lock into struct fsi_master_gpio.
Cheers,
Jeremy
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