From: Daniel Palmer <daniel@0x0f.com>
To: Hector Martin <marcan@marcan.st>
Cc: Tony Lindgren <tony@atomide.com>, Arnd Bergmann <arnd@kernel.org>,
DTML <devicetree@vger.kernel.org>, Marc Zyngier <maz@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>, SoC Team <soc@kernel.org>,
Rob Herring <robh+dt@kernel.org>, Olof Johansson <olof@lixom.net>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 18/18] arm64: apple: Add initial Mac Mini 2020 (M1) devicetree
Date: Wed, 10 Feb 2021 21:24:02 +0900 [thread overview]
Message-ID: <CAFr9PXkLRKHguszidJX2Qit0QUJ0QxFi3H=Wp2HDqpfJQYZEVw@mail.gmail.com> (raw)
In-Reply-To: <4dd911d8-ce84-bf4d-3aae-95ef321b4a97@marcan.st>
Hi Hector,
On Wed, 10 Feb 2021 at 20:49, Hector Martin <marcan@marcan.st> wrote:
> > Yeah, just don't use an imaginary dummy index for the reg. Use a real
> > register offset from a clock controller instance base, and a register
> > bit offset too if needed.
>
> I mean for fixed input clocks without any particular numbering, or for
> temporary fake clocks while we figure out the clock controller. Once a
> real clock controller is involved, if there are hardware indexes
> involved that are consistent then of course I'll use those in some way
> that makes sense.
This exact problem exists for MStar/SigmaStar too.
As it stands there is no documentation to show what the actual clock
tree looks like so everything is guess and I need to come up with numbers.
I'm interested to see what the solution to this is as it will come up again
when mainlining chips without documentation.
> The purpose of the clock in this particular case is just to make the
> uart driver work, since it wants to know its reference clock; there is
> work to be done here to figure out the real clock tree
FWIW arm/boot/dts/mstar-v7.dtsi has the same issue: Needs uart,
has no uart clock. In that instance the uart clock setup by u-boot
is passed to the uart driver as a property instead of creating a fake
clock.
Cheers,
Daniel
next prev parent reply other threads:[~2021-02-10 12:28 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-04 20:39 [PATCH 00/18] Apple M1 SoC platform bring-up Hector Martin
2021-02-04 20:39 ` [PATCH 01/18] dt-bindings: vendor-prefixes: add AAPL prefix Hector Martin
2021-02-08 10:27 ` Krzysztof Kozlowski
2021-02-08 17:32 ` Rob Herring
2021-02-08 18:12 ` Krzysztof Kozlowski
2021-02-08 23:17 ` Hector Martin
2021-02-04 20:39 ` [PATCH 02/18] dt-bindings: arm: cpus: Add AAPL,firestorm & icestorm compatibles Hector Martin
2021-02-04 20:39 ` [PATCH 03/18] dt-bindings: arm: AAPL: Add bindings for Apple ARM platforms Hector Martin
2021-02-04 20:39 ` [PATCH 04/18] arm64: Kconfig: Introduce CONFIG_ARCH_APPLE Hector Martin
[not found] ` <87k0rll4i8.wl-maz@kernel.org>
2021-02-07 8:05 ` Hector Martin 'marcan'
2021-02-04 20:39 ` [PATCH 05/18] tty: serial: samsung_tty: add support for Apple UARTs Hector Martin
2021-02-04 23:55 ` kernel test robot
2021-02-05 9:44 ` Hector Martin 'marcan'
2021-02-05 2:19 ` kernel test robot
[not found] ` <87lfc1l4lo.wl-maz@kernel.org>
2021-02-07 9:12 ` Hector Martin 'marcan'
2021-02-07 9:26 ` Hector Martin 'marcan'
2021-02-08 9:36 ` Krzysztof Kozlowski
2021-02-08 16:14 ` Hector Martin
[not found] ` <73116feaa00de9173d1f2c35ce16e08f@kernel.org>
2021-02-08 16:18 ` Hector Martin
[not found] ` <YCFq3DqOzv4//6Vw@kroah.com>
2021-02-08 23:22 ` Hector Martin
2021-02-08 10:54 ` Krzysztof Kozlowski
2021-02-08 16:10 ` Hector Martin
2021-02-08 18:37 ` Krzysztof Kozlowski
2021-02-08 23:23 ` Hector Martin
2021-02-04 20:39 ` [PATCH 06/18] dt-bindings: serial: samsung: Add AAPL,s5l-uart compatible Hector Martin
2021-02-04 20:39 ` [PATCH 07/18] tty: serial: samsung_tty: enable for ARCH_APPLE Hector Martin
[not found] ` <CAK8P3a1n+C5V5J24myy_h67DVp2YTN5Hd=tCWjPUYZcrAX4hCg@mail.gmail.com>
2021-02-04 21:27 ` Hector Martin 'marcan'
2021-02-04 20:39 ` [PATCH 08/18] arm64: cpufeature: Add a feature for FIQ support Hector Martin
[not found] ` <87im75l2lp.wl-maz@kernel.org>
2021-02-07 8:28 ` Hector Martin 'marcan'
[not found] ` <87czxalrwc.wl-maz@kernel.org>
2021-02-08 15:51 ` Hector Martin
2021-02-04 20:39 ` [PATCH 09/18] arm64: cputype: Add CPU types for the Apple M1 big/little cores Hector Martin
2021-02-04 20:39 ` [PATCH 10/18] arm64: Introduce FIQ support Hector Martin
[not found] ` <87h7mpky0f.wl-maz@kernel.org>
[not found] ` <CAK8P3a0-Qk1WAUaCWeX8Zypphpadan3YAOES9t7LFYBOJkXKog@mail.gmail.com>
2021-02-07 8:36 ` Hector Martin 'marcan'
[not found] ` <CAK8P3a1R51_nqfMWG7SxScJNJEQ3qvp-cynABKEDaQ4O9REM=Q@mail.gmail.com>
2021-02-07 15:38 ` Hector Martin 'marcan'
[not found] ` <CAK8P3a1vmUJ0EpzU2+u2gy8WHCVV5ur9u-oTzU2BP=ddbXQeLQ@mail.gmail.com>
2021-02-08 23:34 ` Hector Martin
2021-02-07 8:47 ` Hector Martin 'marcan'
2021-02-04 20:39 ` [PATCH 11/18] arm64: Kconfig: Require FIQ support for ARCH_APPLE Hector Martin
[not found] ` <87ft29kxmp.wl-maz@kernel.org>
2021-02-07 9:23 ` Hector Martin 'marcan'
[not found] ` <2a93bf0df74df8cb022e61d69d1de88e@kernel.org>
2021-02-08 15:48 ` Hector Martin
2021-02-04 20:39 ` [PATCH 12/18] arm64: setup: Use nGnRnE IO mappings for fixmap on Apple platforms Hector Martin
2021-02-04 20:39 ` [PATCH 13/18] arm64: ioremap: use nGnRnE mappings on platforms that require it Hector Martin
[not found] ` <CAK8P3a2Ad+xmmMWgznOHPpxgCXKWFYfpHBqt_49_UuxrwFSq+A@mail.gmail.com>
2021-02-08 23:20 ` Mark Kettenis
2021-02-09 0:25 ` Hector Martin
[not found] ` <CAK8P3a043eO4p2o6tizR2x7a1TZHMqO7TdX53JC4bTZnbQd9iQ@mail.gmail.com>
2021-02-09 9:58 ` Mark Kettenis
2021-02-09 11:22 ` Hector Martin
2021-02-10 12:24 ` Hector Martin
2021-02-10 13:40 ` Mark Kettenis
2021-02-04 20:39 ` [PATCH 14/18] dt-bindings: interrupt-controller: Add DT bindings for apple-aic Hector Martin
2021-02-09 23:07 ` Rob Herring
2021-02-04 20:39 ` [PATCH 15/18] irqchip/apple-aic: Add support for the Apple Interrupt Controller Hector Martin
[not found] ` <CAK8P3a1zbLM0s_GwkJ0AJQ8cocS-zcsWWKhOB7B99OtRYyDE7g@mail.gmail.com>
2021-02-04 22:04 ` Hector Martin 'marcan'
[not found] ` <CAK8P3a14vsLkCujd_XBAOAjL2h878gxkaoKPpaxL4jddZZcc-A@mail.gmail.com>
2021-02-05 7:41 ` Hector Martin 'marcan'
2021-02-05 2:27 ` kernel test robot
2021-02-05 9:45 ` Hector Martin 'marcan'
[not found] ` <87eehqlxlr.wl-maz@kernel.org>
[not found] ` <CAK8P3a25eFFrMG-9QknFZ6Ckc3-gkiLK=jQdnyTMgn-z4X0RHQ@mail.gmail.com>
2021-02-08 11:13 ` Hector Martin 'marcan'
[not found] ` <87a6selrkt.wl-maz@kernel.org>
2021-02-08 15:31 ` Hector Martin
2021-02-09 6:20 ` Hector Martin
2021-02-04 20:39 ` [PATCH 16/18] irqchip/apple-aic: Add SMP / IPI support Hector Martin
2021-02-04 20:39 ` [PATCH 17/18] dt-bindings: display: add AAPL,simple-framebuffer Hector Martin
2021-02-04 20:39 ` [PATCH 18/18] arm64: apple: Add initial Mac Mini 2020 (M1) devicetree Hector Martin
[not found] ` <CAK8P3a3v6emxavbyjFhY+WdvH1t4EPMZSjEsSx0M+cRqjRCO1g@mail.gmail.com>
2021-02-04 21:44 ` Hector Martin 'marcan'
[not found] ` <CAK8P3a2DawQA-PD5aqbkVPB7UxuohN0oe9mJPe8488pUryotJQ@mail.gmail.com>
2021-02-05 7:11 ` Hector Martin 'marcan'
2021-02-08 11:04 ` Krzysztof Kozlowski
2021-02-08 11:56 ` Hector Martin 'marcan'
2021-02-08 12:13 ` Krzysztof Kozlowski
[not found] ` <CAK8P3a0yBC3dui6vcz+NByWD-3LqRj-2MF89jpjb_k8r5xmNRA@mail.gmail.com>
2021-02-08 14:12 ` Hector Martin
2021-02-08 17:58 ` Rob Herring
2021-02-09 0:32 ` Hector Martin
2021-02-08 19:14 ` Rob Herring
2021-02-09 0:49 ` Hector Martin
2021-02-10 10:19 ` Tony Lindgren
2021-02-10 11:07 ` Hector Martin
2021-02-10 11:34 ` Tony Lindgren
2021-02-10 11:43 ` Hector Martin
2021-02-10 12:24 ` Daniel Palmer [this message]
2021-02-10 12:54 ` Tony Lindgren
2021-02-10 12:56 ` Hector Martin
2021-02-10 12:55 ` Krzysztof Kozlowski
2021-02-10 13:19 ` Tony Lindgren
2021-02-10 13:25 ` Krzysztof Kozlowski
[not found] ` <a2825482e2f68c2f8cad7cb564414759@kernel.org>
2021-02-08 14:53 ` Hector Martin
2021-02-05 11:35 ` [PATCH 00/18] Apple M1 SoC platform bring-up Hector Martin 'marcan'
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