linux-kernel - Re: [PATCH v3 1/6] rtc: zynqmp: declare dependency on arch

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Message-ID: <7786b3e3-15bd-44ee-be05-3ee5aa52743e@amd.com>
Date: Thu, 22 Jan 2026 13:38:22 +0100
From: Michal Simek <michal.simek@....com>
To: Tomas Melin <tomas.melin@...sala.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH v3 1/6] rtc: zynqmp: declare dependency on arch



On 1/22/26 13:25, Tomas Melin wrote:
> Hi,
> 
> On 21/01/2026 14:16, Michal Simek wrote:
>>
>>
>> On 1/19/26 10:51, Tomas Melin wrote:
>>> Driver is compatible with RTC controller found on zynqmp.
>>> Configure dependency to enable building only when zynqmp architecture
>>> is enabled.
>>>
>>> Reported-by: kernel test robot <lkp@...el.com>
>>> Signed-off-by: Tomas Melin <tomas.melin@...sala.com>
>>> ---
>>>    drivers/rtc/Kconfig | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
>>> index 2933c41c77c88e60df721fe65b9c8afb995ae51e..46b497524cbfb5d0c1662dcaddbb6d28b4ae2abe 100644
>>> --- a/drivers/rtc/Kconfig
>>> +++ b/drivers/rtc/Kconfig
>>> @@ -1376,7 +1376,7 @@ config RTC_DRV_OPTEE
>>>    
>>>    config RTC_DRV_ZYNQMP
>>>    	tristate "Xilinx Zynq Ultrascale+ MPSoC RTC"
>>> -	depends on OF && HAS_IOMEM
>>> +	depends on OF && HAS_IOMEM && ARCH_ZYNQMP
>>
>>
>>      arm-linux-gnueabi-ld: drivers/rtc/rtc-zynqmp.o: in function
>> `xlnx_rtc_read_offset':
>>   >> rtc-zynqmp.c:(.text.xlnx_rtc_read_offset+0xd0): undefined reference to
>> `__aeabi_ldivmod'
>>
>> You should use macros like div_u64() to fix it instead of have driver enabled
>> only for ZynqMP.
> I can do it that way if you prefer such approach.

Definitely because this driver could be called from different architectures. 
RISC-V or x86.

Thanks,
Michal