linux-kernel - Re: [RFC v2 3/4] ACPI: DBG2: add 16550 UART with 32-bit access

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Date:   Tue, 6 Dec 2016 22:00:38 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Aleksey Makarov <aleksey.makarov@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Russell King <linux@....linux.org.uk>,
        Peter Hurley <peter@...leysoftware.com>,
        Jon Masters <jcm@...hat.com>, Mark Salter <msalter@...hat.com>,
        Duc Dang <dhdang@....com>, Rob Herring <robh@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Lv Zheng <lv.zheng@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>,
        "devel@...ica.org" <devel@...ica.org>
Subject: Re: [RFC v2 3/4] ACPI: DBG2: add 16550 UART with 32-bit access

On Tue, Dec 6, 2016 at 6:58 PM, Aleksey Makarov
<aleksey.makarov@...aro.org> wrote:
> It was suggested to add a new Microsoft Debug Port Table 2
> (DBG2) (the table used to enumerate the various subtypes of serial
> port covered by the SPCR) 16550 UART subtype that may be needed for
> some additional platforms, such as those based upon AppliedMicro
> X-Gene ARMv8 SoCs.  This new subtype would be 16550-compatible
> with 32-bit access.  There already exists 32-bit variant
> ACPI_DBG2_ARM_SBSA_32BIT of SBSA console ACPI_DBG2_ARM_SBSA_GENERIC.
>
> This patch introduces it to Linux kernel.
>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@...aro.org>
> ---
>  include/acpi/actbl2.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
> index c93dbad..f219b04 100644
> --- a/include/acpi/actbl2.h
> +++ b/include/acpi/actbl2.h
> @@ -371,6 +371,7 @@ struct acpi_dbg2_device {
>
>  #define ACPI_DBG2_16550_COMPATIBLE  0x0000
>  #define ACPI_DBG2_16550_SUBSET      0x0001
> +#define ACPI_DBG2_16550_32BIT       0x0002
>  #define ACPI_DBG2_ARM_PL011         0x0003
>  #define ACPI_DBG2_ARM_SBSA_32BIT    0x000D
>  #define ACPI_DBG2_ARM_SBSA_GENERIC  0x000E
> --

This is an ACPICA change and it first needs to be made to the upstream
ACPICA code base.

Thanks,
Rafael