From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: [RFC 02/17] ARM: call clk_of_init from time_init
Date: Tue, 20 Aug 2013 14:57:55 -0600 [thread overview]
Message-ID: <5213D853.7070102@wwwdotorg.org> (raw)
In-Reply-To: <201308202244.56782.arnd@arndb.de>
On 08/20/2013 02:44 PM, Arnd Bergmann wrote:
> On Tuesday 20 August 2013, Stephen Warren wrote:
>> On 08/19/2013 08:04 PM, Sebastian Hesselbarth wrote:
>>> Most DT ARM machs require common clock providers initialized before timers.
>>> Currently, arch/arm machs use .init_time to call clk_of_init right before
>>> clocksource_of_init. This prevents to remove that hook and use the default
>>> hook instead. clk_of_init now checks for multiple calls to it, so add
>>> the call to ARM arch time_init by default.
>>
>> Some SoCs call this function in .init_irq() rather than .init_time().
>> Perhaps we adjust this patch to do that instead. That way, we can
>> presumably get rid of patch 1/17 since we can eliminate any duplicate
>> calls, and adjust patch 14/17 (Tegra board file) to remove its custom
>> call to of_clock_init(NULL)?
>
> I think we should do thinks as late as possible in general. We probably
> need clocks running on most platforms before we can set up timers, so
> it makes sense to do the clocks first, but very few platforms require
> clocks to be running before the interrupt controller is set up.
>
> A nicer solution would be to change the tegra code to not require this
> to be called this early, if at all possible.
Hmm. This probably isn't too hard. I /think/ the only reason the clocks
are initialized early is:
* The PMC HW block is involved in the path of some interrupts (i.e. it
inverts, or not, the IRQ input pin dedicated to the PMIC).
* So, that part of the PMC must be initialized early so that the IRQ
polarity is correct.
* The PMC initialization is currently monolithic, and the PMC has some
clock inputs, so the init routine ends up calling of_clk_get_by_name(),
and hence clocks must be set up early too.
Perhaps if we just separate tegra_pmc_init() into two functions which
initialize different parts of the PMC, we can get rid of the
tegra_dt_init_irq() -> tegra_pmc_init() -> of_clk_get_by_name() call
path, and hence move Tegra's call to of_clk_init() to the typical place.
I'll try it.
next prev parent reply other threads:[~2013-08-20 20:57 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-20 2:04 [RFC 00/17] ARM: provide common arch init for DT clocks Sebastian Hesselbarth
2013-08-20 2:04 ` [RFC 10/17] ARM: nspire: remove custom .init_time hook Sebastian Hesselbarth
[not found] ` <1376964271-22715-7-git-send-email-sebastian.hesselbarth@gmail.com>
2013-08-20 7:26 ` [RFC 06/17] ARM: imx: " Sascha Hauer
2013-08-20 8:48 ` Sebastian Hesselbarth
2013-08-20 9:10 ` Sascha Hauer
2013-08-20 9:20 ` Sebastian Hesselbarth
2013-08-20 10:20 ` Russell King - ARM Linux
2013-08-20 10:37 ` Sebastian Hesselbarth
2013-08-20 10:42 ` Russell King - ARM Linux
2013-08-20 10:46 ` Sebastian Hesselbarth
[not found] ` <1376964271-22715-9-git-send-email-sebastian.hesselbarth@gmail.com>
2013-08-20 12:50 ` [RFC 08/17] ARM: mvebu: " Ezequiel Garcia
2013-08-20 13:12 ` Sebastian Hesselbarth
2013-08-20 14:01 ` Ezequiel Garcia
2013-08-23 10:06 ` Gregory CLEMENT
2013-08-23 10:32 ` Sebastian Hesselbarth
2013-08-23 11:39 ` Gregory CLEMENT
2013-08-23 12:13 ` Sebastian Hesselbarth
2013-08-23 14:23 ` Gregory CLEMENT
2013-08-23 14:34 ` Gregory CLEMENT
[not found] ` <1376964271-22715-3-git-send-email-sebastian.hesselbarth@gmail.com>
2013-08-20 15:46 ` [RFC 02/17] ARM: call clk_of_init from time_init Stephen Warren
2013-08-20 19:47 ` Sebastian Hesselbarth
2013-08-20 19:52 ` Stephen Warren
2013-08-20 20:19 ` Sebastian Hesselbarth
2013-08-21 18:54 ` Arnd Bergmann
2013-08-22 7:25 ` Mike Turquette
2013-08-22 17:28 ` Arnd Bergmann
2013-08-20 20:44 ` Arnd Bergmann
2013-08-20 20:57 ` Stephen Warren [this message]
2013-08-21 18:51 ` Arnd Bergmann
[not found] ` <1376964271-22715-6-git-send-email-sebastian.hesselbarth@gmail.com>
2013-08-20 19:12 ` [RFC 05/17] ARM: highbank: remove custom .init_time hook Rob Herring
2013-08-20 20:01 ` Sebastian Hesselbarth
[not found] ` <1376964271-22715-18-git-send-email-sebastian.hesselbarth@gmail.com>
2013-08-23 0:26 ` [RFC 17/17] clk: zynq: remove call to of_clk_init Sören Brinkmann
2013-08-23 0:59 ` Sören Brinkmann
2013-08-23 7:32 ` Steffen Trumtrar
2013-08-23 16:00 ` Sören Brinkmann
2013-08-23 23:38 ` Steffen Trumtrar
2013-08-26 11:15 ` Michal Simek
2013-08-26 12:07 ` Steffen Trumtrar
2013-08-26 12:53 ` Sebastian Hesselbarth
2013-08-26 15:14 ` Michal Simek
2013-08-26 15:31 ` Steffen Trumtrar
2013-08-26 15:16 ` Sören Brinkmann
2013-08-26 15:33 ` Steffen Trumtrar
2013-08-23 9:30 ` Sebastian Hesselbarth
2013-08-23 17:19 ` Sören Brinkmann
2013-08-23 17:44 ` Sebastian Hesselbarth
2013-08-23 23:22 ` Steffen Trumtrar
2013-08-26 15:20 ` Sören Brinkmann
2013-08-27 21:27 ` [PATCH RFC v2 00/16] ARM: provide common arch init for DT clocks Sebastian Hesselbarth
2013-08-27 21:27 ` [PATCH RFC v2 01/16] ARM: call clk_of_init from time_init Sebastian Hesselbarth
2013-08-27 22:19 ` Sören Brinkmann
2013-08-27 22:58 ` Sebastian Hesselbarth
2013-08-27 23:20 ` Sören Brinkmann
2013-08-29 13:45 ` Arnd Bergmann
2013-09-04 19:32 ` Sebastian Hesselbarth
2013-09-04 20:41 ` Sören Brinkmann
2013-09-04 20:52 ` Sebastian Hesselbarth
2013-09-04 20:59 ` Sören Brinkmann
2013-09-05 9:34 ` Arnd Bergmann
2013-08-27 21:27 ` [PATCH RFC v2 02/16] ARM: dove: remove custom .init_time hook Sebastian Hesselbarth
2013-08-27 21:27 ` [PATCH RFC v2 03/16] ARM: exynos: " Sebastian Hesselbarth
2013-08-27 21:27 ` [PATCH RFC v2 04/16] ARM: highbank: " Sebastian Hesselbarth
2013-08-27 23:13 ` Mike Turquette
2013-08-27 21:27 ` [PATCH RFC v2 05/16] ARM: imx: " Sebastian Hesselbarth
2013-08-29 11:00 ` Shawn Guo
2013-08-27 21:28 ` [PATCH RFC v2 06/16] ARM: kirkwood: " Sebastian Hesselbarth
2013-08-27 21:28 ` [PATCH RFC v2 07/16] ARM: mvebu: " Sebastian Hesselbarth
2013-08-28 6:28 ` Gregory CLEMENT
2013-08-27 21:28 ` [PATCH RFC v2 08/16] ARM: mxs: " Sebastian Hesselbarth
2013-08-27 23:16 ` Mike Turquette
2013-08-29 11:08 ` Shawn Guo
2013-08-29 11:32 ` Sebastian Hesselbarth
2013-08-29 12:58 ` Shawn Guo
2013-08-27 21:28 ` [PATCH RFC v2 09/16] ARM: nspire: " Sebastian Hesselbarth
2013-08-27 21:28 ` [PATCH RFC v2 10/16] ARM: rockchip: " Sebastian Hesselbarth
2013-08-27 21:28 ` [PATCH RFC v2 11/16] ARM: socfpga: remove call to of_clk_init Sebastian Hesselbarth
2013-08-29 15:38 ` Dinh Nguyen
2013-08-29 17:23 ` Arnd Bergmann
2013-08-27 21:28 ` [PATCH RFC v2 12/16] ARM: sti: remove custom .init_time hook Sebastian Hesselbarth
2013-08-29 16:29 ` [STLinux Kernel] " Srinivas KANDAGATLA
2013-08-27 21:28 ` [PATCH RFC v2 13/16] ARM: tegra: split tegra_pmc_init() in two Sebastian Hesselbarth
2013-08-27 21:59 ` Stephen Warren
2013-08-27 22:09 ` Sebastian Hesselbarth
2013-09-11 19:56 ` Stephen Warren
2013-09-12 6:21 ` Sebastian Hesselbarth
2013-09-12 16:32 ` Stephen Warren
2013-08-27 21:28 ` [PATCH RFC v2 14/16] ARM: vexpress: remove custom .init_time hook Sebastian Hesselbarth
2013-08-29 13:35 ` Arnd Bergmann
2013-08-29 18:16 ` Sebastian Hesselbarth
2013-08-30 10:02 ` Jon Medhurst (Tixy)
2013-08-30 11:39 ` Russell King - ARM Linux
2013-08-30 13:12 ` Pawel Moll
2013-08-27 21:28 ` [PATCH RFC v2 15/16] clk: vt8500: remove call to of_clk_init Sebastian Hesselbarth
2013-08-27 23:16 ` Mike Turquette
2013-08-29 13:42 ` Arnd Bergmann
2013-08-27 21:28 ` [PATCH RFC v2 16/16] ARM: zynq: Don't call of_clk_init() Sebastian Hesselbarth
2013-08-29 13:37 ` Arnd Bergmann
2013-08-29 14:21 ` Michal Simek
2013-08-29 17:20 ` Arnd Bergmann
2013-08-29 18:14 ` Michal Simek
2013-08-29 18:20 ` Sebastian Hesselbarth
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