From: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
To: Joel Stanley <joel@jms.id.au>
Cc: "Russell King" <linux@armlinux.org.uk>,
openbmc@lists.ozlabs.org,
"Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] ARM: Add wpcm450_defconfig for Nuvoton WPCM450
Date: Thu, 3 Nov 2022 16:27:42 +0100 [thread overview]
Message-ID: <Y2Pd7vIkOu0ptVMb@probook> (raw)
In-Reply-To: <CACPK8XfnRExua7ZhyAkMNUNwUtmcXrBL3phf9ZMCzpBMN452hw@mail.gmail.com>
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On Wed, Nov 02, 2022 at 10:29:58PM +0000, Joel Stanley wrote:
> On Tue, 1 Nov 2022 at 11:22, Jonathan Neuschäfer <j.neuschaefer@gmx.net> wrote:
> >
> > This defconfig aims to offer a reasonable set of defaults for all
> > systems running on a Nuvoton WPCM450 chip.
>
> I was going to ask if we could instead have a common nuvoton
> defconfig, but this is an ARMv5 part so we can't also select the ARMv7
> npcm750.
Correct.
>
> Reviewed-by: Joel Stanley <joel@jms.id.au>
>
> > +CONFIG_ARM_APPENDED_DTB=y
>
> Do you use this? OpenBMC systems tend to just use FIT, so we don't
> need this option.
I use this, because there is no modern U-Boot port for WPCM450 yet
(as far as I'm aware).
> > +CONFIG_KEXEC=y
I also use kexec, it's useful during development, but I see that it's
not so useful for the BMC usecase.
> > +CONFIG_CPU_FREQ=y
>
> Does the wpcm do frequency scaling? If not you could disable this.
No, as it currently stands the clock driver is read-only except for the
clock gates, and there is no cpufreq. I'll disable this option.
CPU_IDLE could plausibly be implemented on WPCM450, but currently isn't.
Thanks,
Jonathan
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WARNING: multiple messages have this Message-ID (diff)
From: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
To: Joel Stanley <joel@jms.id.au>
Cc: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"Russell King" <linux@armlinux.org.uk>
Subject: Re: [PATCH v3] ARM: Add wpcm450_defconfig for Nuvoton WPCM450
Date: Thu, 3 Nov 2022 16:27:42 +0100 [thread overview]
Message-ID: <Y2Pd7vIkOu0ptVMb@probook> (raw)
In-Reply-To: <CACPK8XfnRExua7ZhyAkMNUNwUtmcXrBL3phf9ZMCzpBMN452hw@mail.gmail.com>
[-- Attachment #1.1: Type: text/plain, Size: 1189 bytes --]
On Wed, Nov 02, 2022 at 10:29:58PM +0000, Joel Stanley wrote:
> On Tue, 1 Nov 2022 at 11:22, Jonathan Neuschäfer <j.neuschaefer@gmx.net> wrote:
> >
> > This defconfig aims to offer a reasonable set of defaults for all
> > systems running on a Nuvoton WPCM450 chip.
>
> I was going to ask if we could instead have a common nuvoton
> defconfig, but this is an ARMv5 part so we can't also select the ARMv7
> npcm750.
Correct.
>
> Reviewed-by: Joel Stanley <joel@jms.id.au>
>
> > +CONFIG_ARM_APPENDED_DTB=y
>
> Do you use this? OpenBMC systems tend to just use FIT, so we don't
> need this option.
I use this, because there is no modern U-Boot port for WPCM450 yet
(as far as I'm aware).
> > +CONFIG_KEXEC=y
I also use kexec, it's useful during development, but I see that it's
not so useful for the BMC usecase.
> > +CONFIG_CPU_FREQ=y
>
> Does the wpcm do frequency scaling? If not you could disable this.
No, as it currently stands the clock driver is read-only except for the
clock gates, and there is no cpufreq. I'll disable this option.
CPU_IDLE could plausibly be implemented on WPCM450, but currently isn't.
Thanks,
Jonathan
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WARNING: multiple messages have this Message-ID (diff)
From: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
To: Joel Stanley <joel@jms.id.au>
Cc: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"Russell King" <linux@armlinux.org.uk>
Subject: Re: [PATCH v3] ARM: Add wpcm450_defconfig for Nuvoton WPCM450
Date: Thu, 3 Nov 2022 16:27:42 +0100 [thread overview]
Message-ID: <Y2Pd7vIkOu0ptVMb@probook> (raw)
In-Reply-To: <CACPK8XfnRExua7ZhyAkMNUNwUtmcXrBL3phf9ZMCzpBMN452hw@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1189 bytes --]
On Wed, Nov 02, 2022 at 10:29:58PM +0000, Joel Stanley wrote:
> On Tue, 1 Nov 2022 at 11:22, Jonathan Neuschäfer <j.neuschaefer@gmx.net> wrote:
> >
> > This defconfig aims to offer a reasonable set of defaults for all
> > systems running on a Nuvoton WPCM450 chip.
>
> I was going to ask if we could instead have a common nuvoton
> defconfig, but this is an ARMv5 part so we can't also select the ARMv7
> npcm750.
Correct.
>
> Reviewed-by: Joel Stanley <joel@jms.id.au>
>
> > +CONFIG_ARM_APPENDED_DTB=y
>
> Do you use this? OpenBMC systems tend to just use FIT, so we don't
> need this option.
I use this, because there is no modern U-Boot port for WPCM450 yet
(as far as I'm aware).
> > +CONFIG_KEXEC=y
I also use kexec, it's useful during development, but I see that it's
not so useful for the BMC usecase.
> > +CONFIG_CPU_FREQ=y
>
> Does the wpcm do frequency scaling? If not you could disable this.
No, as it currently stands the clock driver is read-only except for the
clock gates, and there is no cpufreq. I'll disable this option.
CPU_IDLE could plausibly be implemented on WPCM450, but currently isn't.
Thanks,
Jonathan
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next prev parent reply other threads:[~2022-11-03 15:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-01 11:21 [PATCH v3] ARM: Add wpcm450_defconfig for Nuvoton WPCM450 Jonathan Neuschäfer
2022-11-01 11:21 ` Jonathan Neuschäfer
2022-11-01 11:21 ` Jonathan Neuschäfer
2022-11-02 22:29 ` Joel Stanley
2022-11-02 22:29 ` Joel Stanley
2022-11-03 15:27 ` Jonathan Neuschäfer [this message]
2022-11-03 15:27 ` Jonathan Neuschäfer
2022-11-03 15:27 ` Jonathan Neuschäfer
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