Messages in this thread | | | Date | Tue, 19 Oct 2021 17:37:34 +0700 | Subject | Re: [PATCH v2 1/3] ARM: dts: aspeed: mtjade: Add some gpios | From | Thang Nguyen <> |
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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. Can you give an example of the suggested change? > >> >> 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. [Thang] The BMC_I2C4_O_EN GPIO is used in kernel only which enabling access to all I2C devices in I2C4 bus, like FRU EEPROM. As it is used as gpio-hog, no userspace access is allowed/intended. It can't be configured in userspace as FRU EEPROM is probed only in kernel boot. > > 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. [Thang] I am aware of this GPIO naming convention document. But I think it is to define common name for special GPIOs that applications can use.
>> >> 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. [Thang] is there any application to use this pin name? > >> /*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 >>
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