linux-kernel - Re: [PATCH 1/3] serial: 8250: of: Check for CONFIG_SERIAL_8250

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Message-ID: <CA+-6iNxteaMui4XdC-eMctguuZs3T-G85UMuwa7fNUCkJqE1Cw@mail.gmail.com>
Date:   Mon, 23 Nov 2020 10:58:20 -0500
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     Al Cooper <alcooperx@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        Jim Quinlan <jquinlan@...adcom.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE" 
        <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/3] serial: 8250: of: Check for CONFIG_SERIAL_8250_BCM7271

On Fri, Nov 20, 2020 at 2:45 PM Al Cooper <alcooperx@...il.com> wrote:
>
> From: Jim Quinlan <jquinlan@...adcom.com>
>
> This commit has of_platform_serial_probe() check specifically for the
> "brcm,bcm7271-uart" and whether its companion driver is enabled. If it
> is the case, and the clock provider is not ready, we want to make sure
> that when the 8250_bcm7271.c driver returns EPROBE_DEFER, we are not
> getting the UART registered via 8250_of.c.
>
> Signed-off-by: Jim Quinlan <jquinlan@...adcom.com>
> ---
>  drivers/tty/serial/8250/8250_of.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
> index 65e9045dafe6..aa458f3c6644 100644
> --- a/drivers/tty/serial/8250/8250_of.c
> +++ b/drivers/tty/serial/8250/8250_of.c
> @@ -192,6 +192,10 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
>         u32 tx_threshold;
>         int ret;
>
> +       if (IS_ENABLED(CONFIG_SERIAL_8250_BCM7271) &&
> +           of_device_is_compatible(ofdev->dev.of_node, "brcm,bcm7271-uart"))
> +               return -ENODEV;
> +
NOTE: this commit is a "strawman" commit, and I will not be surprised
if it gets quickly NAKed. We have a new idea on how to solve this
issue, and if that not is not viable, will ask for a dialog on this
problem either in this thread or through a separate RFC.

Regards,
Jim Quinlan
Broadcom STB



>         port_type = (unsigned long)of_device_get_match_data(&ofdev->dev);
>         if (port_type == PORT_UNKNOWN)
>                 return -EINVAL;
> --
> 2.17.1
>

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