[Skiboot] [PATCH v2 1/5] npu2-opencapi: Use presence detection
andrew.donnellan at au1.ibm.com
Thu May 31 15:14:31 AEST 2018
On 24/05/18 03:25, Frederic Barrat wrote:
> From: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> Presence detection is not part of the opencapi specification. So each
> platform may choose to implement it the way it wants.
> All current platforms implement it through an i2c device where we can
> query a pin to know if a device is connected or not. ZZ and Zaius have
> a similar design and even use the same i2c information and pin
> However, presence detection on older ZZ planar (older than v4) doesn't
> work, so we don't activate it for now, until our lab systems are
> upgraded and it's better tested.
> Presence detection on witherspoon is still being worked on. It's
> shaping up to be quite different, so we may have to revisit the topic
> in a later patch.
> Signed-off-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
Andrew Donnellan OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com IBM Australia Limited
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