[PATCH V3 3/4] serial: bcm2835: add driver for bcm2835-aux-uart

[Eric Anholt]

kernel at martin.sperl.org writes:

> From: Martin Sperl <kernel at martin.sperl.org>
>
> The bcm2835 SOC contains an auxiliary uart, which is very close
> to the ns16550 with some differences.
>
> The big difference is that the uart HW is not using an internal divider
> of 16 but 8, which results in an effictive baud-rate being twice
> the requested baud-rate.
>
> This driver handles this device correctly and handles the difference in
> the HW divider by scaling up the clock by a factor of 2.
>
> The approach to write a separate (wrapper) driver instead of using a
> multiplying clock and "ns16550" as compatibility in the device-tree
> has been recommended by Stephen Warren.
>
> Signed-off-by: Martin Sperl <kernel at martin.sperl.org>

Acked-by: Eric Anholt <eric at anholt.net>
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