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Subject: Re: [PATCH v2 1/3] ARM: dts: aspeed: mtjade: Add some gpios
From: Quan Nguyen <quan@os.amperecomputing.com>
To: Joel Stanley <joel@jms.id.au>
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 <openbmc-bounces+openbmc=archiver.kernel.org@lists.ozlabs.org>

Dear Joel,

I found this patch appears in linux-next tree as in [1], can we expect 
the remain two patches in this patchset ([2] and [3]) will be merged soon?

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20211029&id=0b32c1b4071c482f2cf98b717cfc7380423ec619

[2] https://www.spinics.net/lists/kernel/msg4115571.html
[3] https://www.spinics.net/lists/kernel/msg4115572.html

Thanks,
- Quan

On 25/10/2021 11:44, Quan Nguyen wrote:
> On 19/10/2021 13:46, Joel Stanley wrote:
>> On Tue, 19 Oct 2021 at 06:02, Quan Nguyen 
>> <quan@os.amperecomputing.com> wrote:
>>>
>>> Add S0_SCP_AUTH_FAIL, S1_SCP_AUTH_FAIL gpios to indicates firmware
>>> authentication fail on each socket.
>>
>> These use the gpio-keys API to expose the GPIOs. I think OpenBMC is
>> moving away from this abstraction, and instead reading the GPIOs with
>> the gpio chardev interface.
>>
> Thanks Joel for the review,
> Yes, will switch to use gpio chardev interface and will remove these 
> gpio-keys defined in next version
> 
>>>
>>> Add gpio RTC_BAT_SEN_EN to enable RTC battery adc sensor.
>>>
>>> Add BMC_I2C4_O_EN gpio to go high at boot to enable access to I2C4 bus.
>>
>> OpenBMC has started a process to document GPIOs that are exposed to
>> userspace, initially so a common userspace can be used across
>> machines. I like doing it for the additional reason that it provides
>> consistency in the naming.
>>
>> https://github.com/openbmc/docs/blob/master/designs/device-tree-gpio-naming.md 
>>
>>
>> If you could take a look at that document and add your GPIOs where
>> possible, and then update the device tree.
>>
> 
> There is on-going discussion about naming of the RTC voltage sensing 
> enable gpio pin in [1], So I'd like to address this change later in 
> separate patch when this is settled. Hence, I will remove this changes 
> in next version.
> 
> [1] https://gerrit.openbmc-project.xyz/c/openbmc/docs/+/48018
> 
> About the BMC_I2C4_O_EN, this is needed as gpio-hog to make the i2c bus 
> accessible at boot time so I will keep this in next version.
> In fact, I'm still a bit of confuse if this pin needs a common name as 
> it is just to enable the bus access and does not serve for any 
> particular common purpose.
> 
> Thanks,
> - Quan
> 
>>>
>>> Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
>>> Signed-off-by: Thang Nguyen <thang@os.amperecomputing.com>
>>> ---
>>> v2:
>>>    - None
>>>
>>>   .../arm/boot/dts/aspeed-bmc-ampere-mtjade.dts | 21 ++++++++++++++++++-
>>>   1 file changed, 20 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dts 
>>> b/arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dts
>>> index 57b0c45a2298..3515d55bd312 100644
>>> --- a/arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dts
>>> +++ b/arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dts
>>> @@ -86,6 +86,18 @@ S0_cpu_fault {
>>>                          linux,code = <ASPEED_GPIO(J, 1)>;
>>>                  };
>>>
>>> +               S0_scp_auth_fail {
>>> +                       label = "S0_SCP_AUTH_FAIL";
>>> +                       gpios = <&gpio ASPEED_GPIO(J, 2) 
>>> GPIO_ACTIVE_LOW>;
>>> +                       linux,code = <ASPEED_GPIO(J, 2)>;
>>> +               };
>>> +
>>> +               S1_scp_auth_fail {
>>> +                       label = "S1_SCP_AUTH_FAIL";
>>> +                       gpios = <&gpio ASPEED_GPIO(Z, 5) 
>>> GPIO_ACTIVE_LOW>;
>>> +                       linux,code = <ASPEED_GPIO(Z, 5)>;
>>> +               };
>>> +
>>>                  S1_overtemp {
>>>                          label = "S1_OVERTEMP";
>>>                          gpios = <&gpio ASPEED_GPIO(Z, 6) 
>>> GPIO_ACTIVE_LOW>;
>>> @@ -590,7 +602,7 @@ &gpio {
>>>          /*Q0-Q7*/       "","","","","","UID_BUTTON","","",
>>>          /*R0-R7*/       "","","BMC_EXT_HIGHTEMP_L","OCP_AUX_PWREN",
>>>                          "OCP_MAIN_PWREN","RESET_BUTTON","","",
>>> -       /*S0-S7*/       "","","","","","","","",
>>> +       /*S0-S7*/       "","","","","RTC_BAT_SEN_EN","","","",
>>
>> I suggest you create a proposal to call this one
>> battery-voltage-read-enable. I know that some of the IBM machines
>> intend to have this same GPIO.
>>
>>>          /*T0-T7*/       "","","","","","","","",
>>>          /*U0-U7*/       "","","","","","","","",
>>>          /*V0-V7*/       "","","","","","","","",
>>> @@ -604,4 +616,11 @@ &gpio {
>>>                          "S1_BMC_DDR_ADR","","","","",
>>>          /*AC0-AC7*/     
>>> "SYS_PWR_GD","","","","","BMC_READY","SLAVE_PRESENT_L",
>>>                          "BMC_OCP_PG";
>>> +
>>> +       i2c4_o_en {
>>> +               gpio-hog;
>>> +               gpios = <ASPEED_GPIO(Y, 2) GPIO_ACTIVE_HIGH>;
>>> +               output-high;
>>> +               line-name = "BMC_I2C4_O_EN";
>>> +       };
>>>   };
>>> -- 
>>> 2.28.0
>>>
>