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Re: [PATCH v4 05/11] ppc/pnv: Wire up pca9552 GPIO pins for PCIe hotplug


From: Cédric Le Goater
Subject: Re: [PATCH v4 05/11] ppc/pnv: Wire up pca9552 GPIO pins for PCIe hotplug power control
Date: Wed, 22 Nov 2023 08:44:14 +0100
User-agent: Mozilla Thunderbird

Adding Reza.

On 11/21/23 21:03, Miles Glenn wrote:
On Tue, 2023-11-21 at 19:36 +0100, Cédric Le Goater wrote:
On 11/21/23 00:51, Glenn Miles wrote:
For power10-rainier, a pca9552 device is used for PCIe slot hotplug
power control by the Power Hypervisor code.  The code expects that
some time after it enables power to a PCIe slot by asserting one of
the pca9552 GPIO pins 0-4, it should see a "power good" signal
asserted
on one of pca9552 GPIO pins 5-9.

And this is what OPAL is not doing :

https://github.com/open-power/skiboot/blob/master/platforms/astbmc/rainier.c#L65

Correct ?


Ah, yes, I believe you are correct!
Thanks,

C.





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