linux-kernel - Re: [PATCH v4 32/47] serial: ucc_uart: use of_property_read_u32() in ucc_uart

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Date:   Fri, 15 Nov 2019 09:01:08 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Timur Tabi <timur@...nel.org>
Cc:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Scott Wood <oss@...error.net>, linux-serial@...r.kernel.org
Subject: Re: [PATCH v4 32/47] serial: ucc_uart: use of_property_read_u32() in
 ucc_uart_probe()

On 14/11/2019 14.57, Timur Tabi wrote:
> On Fri, Nov 8, 2019 at 7:03 AM Rasmus Villemoes
> <linux@...musvillemoes.dk> wrote:
>>
>> -       if (*iprop)
>> -               qe_port->port.uartclk = *iprop;
>> +       if (val)
>> +               qe_port->port.uartclk = val;
>>         else {
>>                 /*
>>                  * Older versions of U-Boot do not initialize the brg-frequency
>>                  * property, so in this case we assume the BRG frequency is
>>                  * half the QE bus frequency.
>>                  */
> 
> This bug in older U-Boots is definitely PowerPC-specific, so could you
> change this so that it reports an error on ARM if brg-frequency is
> zero, and displays a warning on PowerPC?
> 

That would be a separate patch, this patch is only concerned with
eliminating the implicit assumption of the host being big-endian. And
there's already been some pushback to adding arch-specific ifdefs (which
I agree with, but as I responded there see as the lesser evil), so
unless there's a very good reason to add that complexity, I'd rather not.

Rasmus