linux-kernel - Re: [PATCH v8 05/26] clocksource: Add driver for the Ingenic JZ47xx OST

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Date:   Wed, 23 Jan 2019 14:25:53 -0300
From:   Paul Cercueil <paul@...pouillou.net>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Mathieu Malaterre <malat@...ian.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Ezequiel Garcia <ezequiel@...labora.co.uk>,
        PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>,
        linux-pwm@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-watchdog@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-clk@...r.kernel.org, od@...c.me,
        Maarten ter Huurne <maarten@...ewalker.org>
Subject: Re: [PATCH v8 05/26] clocksource: Add driver for the Ingenic JZ47xx
 OST

Hi,

Le mer. 23 janv. 2019 à 11:31, Guenter Roeck <linux@...ck-us.net> a 
écrit :
> On 1/23/19 4:58 AM, Mathieu Malaterre wrote:
>> On Wed, Dec 12, 2018 at 11:09 PM Paul Cercueil 
>> <paul@...pouillou.net> wrote:
>>> 
>>> From: Maarten ter Huurne <maarten@...ewalker.org>
>>> 
>>> OST is the OS Timer, a 64-bit timer/counter with buffered reading.
>>> 
>>> SoCs before the JZ4770 had (if any) a 32-bit OST; the JZ4770 and
>>> JZ4780 have a 64-bit OST.
>>> 
>>> This driver will register both a clocksource and a sched_clock to 
>>> the
>>> system.
>>> 
>>> Signed-off-by: Maarten ter Huurne <maarten@...ewalker.org>
>>> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>>> ---
>>> 
>>> Notes:
>>>       v5: New patch
>>> 
>>>       v6: - Get rid of SoC IDs; pass pointer to 
>>> ingenic_ost_soc_info as
>>>             devicetree match data instead.
>>>           - Use device_get_match_data() instead of the of_* variant
>>>           - Handle error of dev_get_regmap() properly
>>> 
>>>       v7: Fix section mismatch by using 
>>> builtin_platform_driver_probe()
>>> 
>>>       v8: builtin_platform_driver_probe() does not work anymore in
>>>           4.20-rc6? The probe function won't be called. Work around 
>>> this
>>>           for now by using late_initcall.
>>> 
> 
> Did anyone notice this ? Either something is wrong with the driver, or
> with the kernel core. Hacking around it seems like the worst possible
> "solution".

I can confirm it still happens on 5.0-rc3.

Just to explain what I'm doing:

My ingenic-timer driver probes with builtin_platform_driver_probe (this 
works),
and then calls of_platform_populate to probe its children. This driver,
ingenic-ost, is one of them, and will fail to probe with
builtin_platform_driver_probe.

-Paul