linux-kernel - Re: [PATCHv2] clocksource: dw_apb_timer_of: add error handling if no clock available

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Date:   Fri, 4 Dec 2020 16:39:39 -0600
From:   Dinh Nguyen <dinguyen@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        Jisheng.Zhang@...aptics.com, arnd@...db.de
Subject: Re: [PATCHv2] clocksource: dw_apb_timer_of: add error handling if no
 clock available



On 12/4/20 2:00 PM, Daniel Lezcano wrote:
> On 04/12/2020 16:36, Dinh Nguyen wrote:
>> commit ("b0fc70ce1f02 arm64: berlin: Select DW_APB_TIMER_OF") added the
>> support for the dw_apb_timer into the arm64 defconfig. However, for some
>> platforms like the Intel Stratix10 and Agilex, the clock manager doesn't
>> get loaded until after the timer driver get loaded. Thus, the driver hits
>> the panic "No clock nor clock-frequency property for" because it cannot
>> properly get the clock.
>>
>> This patch adds the error handling needed for the timer driver so that
>> the kernel can continue booting instead of just hitting the panic.
>>
>> Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
> 
> Did you have time to test the different combinations ?

I did test both versions and did not see any difference between the two. 
On both versions, the kernel was able to continue to boot after trying 
to probe the timer driver.

Dinh