system power control

[Bills, Jason M]

On 8/7/2020 6:19 PM, Zhao Kun wrote:
> Thank you, Jason. Could you share with me any example of defining those 
> GPIOs in device tree for x86-power-control? I can’t find any in 
> aspeed-bmc-intel-s2600wf.dts.

Sorry for not sending link before.  You can find our DTS implementation 
here: 
https://github.com/Intel-BMC/openbmc/blob/intel/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0001-arm-dts-add-DTS-for-Intel-ast2500-platforms.patch.

> 
> Thanks.
> 
> Best regards,
> 
> Kun Zhao
> 
> /*
> 
> zkxz at hotmail.com <mailto:zkxz at hotmail.com>
> 
> */
> 
> *From: *Bills, Jason M <mailto:jason.m.bills at linux.intel.com>
> *Sent: *Friday, August 7, 2020 10:12 AM
> *To: *openbmc at lists.ozlabs.org <mailto:openbmc at lists.ozlabs.org>
> *Subject: *Re: system power control
> 
> 
> 
> On 8/6/2020 11:43 PM, Zhao Kun wrote:
>  > Hi,
>  >
>  > I’m new to learn how to make OpenBMC work on a X86 based system.
>  > Currently I met a problem of mapping the GPIOs about power
>  > on/off/reset/status into OpenBMC logic. I understand when user issue a
>  > power on request through any user interfaces like RESTful, IPMI, etc.,
>  > some service (phosphor-state-manager?) will be triggered to check
>  > current status and roll out corresponding systemd services to do the
>  > job. (please correct me if I’m wrong)
>  >
>  > But I’m just confused on how those services actually toggle or check the
>  > GPIOs, there seems be many choices,
>  >
>  >  1. Device tree?
>  >  2. Using Workbook gpio_defs.json?
>  >  3. Create some services calling platform specific scripts to operate
>  >     GPIO or I2C devices?
>  >  4. Using x86-power-control?
>  >
>  > So what’s the most recommended way to do it? Really appreciated If
>  > anyone can share some lights.
> On Intel reference platforms, we use x86-power-control and configure the
> GPIO names using device tree.
> 
>  >
>  > I thought there must be a mechanism to consume some kind of
>  > configuration file as the hardware abstraction layer. So I guess it
>  > might be gpio_defs.json or device tree.
>  >
>  > Thanks.
>  >
>  > Best regards,
>  >
>  > Kun Zhao
>  >
>  > /*
>  >
>  > zkxz at hotmail.com <mailto:zkxz at hotmail.com>
>  >
>  > */
>  >
>