Re: [PATCH v2 1/8] ppc/pnv: Add pca9552 to powernv10 for PCIe hotplug power control

[Miles Glenn <milesg@linux.vnet.ibm.com>]

On Mon, 2023-11-13 at 10:05 +0100, Cédric Le Goater wrote:
> On 11/10/23 20:49, Glenn Miles wrote:
> > The Power Hypervisor code expects to see a pca9552 device connected
> > to the 3rd PNV I2C engine on port 1 at I2C address 0x63 (or left-
> > justified address of 0xC6).  This is used by hypervisor code to
> > control PCIe slot power during hotplug events.
> > 
> > Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
> > ---
> > Based-on: <20231024181144.4045056-3-milesg@linux.vnet.ibm.com>
> > [PATCH v3 2/2] misc/pca9552: Let external devices set pca9552
> > inputs
> 
> Has this series been reviewed / merged ? If not, I would include the
> patches in this one.
> 

It has been reviewed but not yet merged.

-Glenn

> >   hw/ppc/Kconfig | 1 +
> >   hw/ppc/pnv.c   | 7 +++++++
> >   2 files changed, 8 insertions(+)
> > 
> > diff --git a/hw/ppc/Kconfig b/hw/ppc/Kconfig
> > index 56f0475a8e..f77ca773cf 100644
> > --- a/hw/ppc/Kconfig
> > +++ b/hw/ppc/Kconfig
> > @@ -32,6 +32,7 @@ config POWERNV
> >       select XIVE
> >       select FDT_PPC
> >       select PCI_POWERNV
> > +    select PCA9552
> >   
> >   config PPC405
> >       bool
> > diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> > index 9c29727337..7afaf1008f 100644
> > --- a/hw/ppc/pnv.c
> > +++ b/hw/ppc/pnv.c
> > @@ -1877,6 +1877,13 @@ static void
> > pnv_chip_power10_realize(DeviceState *dev, Error **errp)
> >                                 qdev_get_gpio_in(DEVICE(&chip10-
> > >psi),
> >                                                  PSIHB9_IRQ_SBE_I2C
> > ));
> >       }
> > +
> > +    /*
> > +     * Add a PCA9552 I2C device for PCIe hotplug control
> > +     * to engine 2, bus 1, address 0x63
> > +     */
> > +    i2c_slave_create_simple(chip10->i2c[2].busses[1], "pca9552",
> > 0x63);
> > +
> 
> Are all POWER10 chips wired this way (on rainier, denali, etc) ?
> or is this device board specific ? If this is the case, then we
> should introduce a new custom powernv10 machine. Please take a
> look at the Aspeed machines for an example.
> 
> 
> Thanks,
> 
> C.
> 
> 
> 
> >   }
> >   
> >   static uint32_t pnv_chip_power10_xscom_pcba(PnvChip *chip,
> > uint64_t addr)