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In-Reply-To: <4eb31178-cf05-24cd-6a75-6628689cef25@os.amperecomputing.com>
From:   Joel Stanley <joel@jms.id.au>
Date:   Tue, 16 Nov 2021 05:24:41 +0000
Message-ID: <CACPK8XfwRNEMFB6fPYn2z22-KBSt90xRhEuKa1jxO_dpkcf24g@mail.gmail.com>
Subject: Re: [PATCH v2 1/3] ARM: dts: aspeed: mtjade: Add some gpios
To:     Quan Nguyen <quan@os.amperecomputing.com>
Cc:     Rob Herring <robh+dt@kernel.org>, Andrew Jeffery <andrew@aj.id.au>,
        devicetree <devicetree@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        linux-aspeed <linux-aspeed@lists.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        OpenBMC Maillist <openbmc@lists.ozlabs.org>,
        Open Source Submission <patches@amperecomputing.com>,
        Phong Vo <phong@os.amperecomputing.com>,
        "Thang Q . Nguyen" <thang@os.amperecomputing.com>
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On Mon, 1 Nov 2021 at 09:32, Quan Nguyen <quan@os.amperecomputing.com> wrote:
>
> 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?

I am not sure why I merged the first patch but not the next two. I
think this was a mistake.

They are queued for merging in v5.17.

>
> [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
> >>>
> >
>