linux-kernel - Re: [net-next: PATCH v3 1/1] ACPI: SPCR: Add new 16550-compatible Serial Port Subtype

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Message-ID: <CAPv3WKctDU7WOxHzeHc49-G_h42qX-pUpinJN2CVHNoRH86QHw@mail.gmail.com>
Date:   Mon, 21 Jun 2021 22:06:58 +0200
From:   Marcin Wojtas <mw@...ihalf.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        devel@...ica.org
Subject: Re: [net-next: PATCH v3 1/1] ACPI: SPCR: Add new 16550-compatible
 Serial Port Subtype

Apologies for the patch prefix, of course it's a first version and
unrelated to the networking subsystem.

Best regards,
Marcin


pon., 21 cze 2021 o 22:05 Marcin Wojtas <mw@...ihalf.com> napisał(a):
>
> The Microsoft Debug Port Table 2 (DBG2) specification revision
> May 31, 2017 adds support for 16550-compatible Serial Port
> Subtype with parameters defined in Generic Address Structure (GAS) [1]
>
> Add its support in SPCR parsing routine.
>
> [1] https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/acpi-debug-port-table
>
> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
> ---
>  include/acpi/actbl1.h | 1 +
>  drivers/acpi/spcr.c   | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
> index ce59903c2695..f746012eba8d 100644
> --- a/include/acpi/actbl1.h
> +++ b/include/acpi/actbl1.h
> @@ -498,6 +498,7 @@ struct acpi_dbg2_device {
>  #define ACPI_DBG2_ARM_SBSA_GENERIC  0x000E
>  #define ACPI_DBG2_ARM_DCC           0x000F
>  #define ACPI_DBG2_BCM2835           0x0010
> +#define ACPI_DBG2_16550_WITH_GAS    0x0012
>
>  #define ACPI_DBG2_1394_STANDARD     0x0000
>
> diff --git a/drivers/acpi/spcr.c b/drivers/acpi/spcr.c
> index 88460bacd5ae..25c2d0be953e 100644
> --- a/drivers/acpi/spcr.c
> +++ b/drivers/acpi/spcr.c
> @@ -136,6 +136,7 @@ int __init acpi_parse_spcr(bool enable_earlycon, bool enable_console)
>                 break;
>         case ACPI_DBG2_16550_COMPATIBLE:
>         case ACPI_DBG2_16550_SUBSET:
> +       case ACPI_DBG2_16550_WITH_GAS:
>                 uart = "uart";
>                 break;
>         default:
> --
> 2.29.0
>