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

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Date:   Thu, 14 Nov 2019 07:57:12 -0600
From:   Timur Tabi <timur@...nel.org>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
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 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?