linux-kernel - Re: [PATCH 3/3] serial: pl011: add acpi

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Message-ID: <CAHp75VcnEOB8_GMwi894XJXN+CtJr_vDxGMP0GHw4JhALynDyw@mail.gmail.com>
Date:	Mon, 25 Jan 2016 16:21:19 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Aleksey Makarov <aleksey.makarov@...aro.org>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Jiri Slaby <jslaby@...e.com>,
	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
Subject: Re: [PATCH 3/3] serial: pl011: add acpi_match for amba-pl011.c

On Mon, Jan 25, 2016 at 1:45 PM, Aleksey Makarov
<aleksey.makarov@...aro.org> wrote:
> Add an implementation of acpi_match() to the pl011 driver.
> It allows to check if the console matches one specified with
> ACPI SPCR table.

I don't know Rafael's opinion on this, but I would split it to extend
ACPI header first with reference to newest revision of Microsoft
document.

>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@...aro.org>
> ---
>  drivers/tty/serial/amba-pl011.c | 14 ++++++++++++++
>  include/acpi/actbl2.h           |  4 ++++
>  2 files changed, 18 insertions(+)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 899a771..3f4aa1b 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2189,12 +2189,26 @@ static int __init pl011_console_setup(struct console *co, char *options)
>         return uart_set_options(&uap->port, co, baud, parity, bits, flow);
>  }
>
> +static int __init pl011_console_acpi_match(struct console *co,
> +                                          struct acpi_table_spcr *spcr)
> +{
> +       struct uart_amba_port *uap = amba_ports[co->index];
> +
> +       if (spcr->interface_type == ACPI_DBG2_ARM_PL011 &&
> +           spcr->serial_port.space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY &&
> +           spcr->serial_port.address == (u64)uap->port.mapbase)
> +               return 0;
> +
> +       return -ENODEV;
> +}
> +
>  static struct uart_driver amba_reg;
>  static struct console amba_console = {
>         .name           = "ttyAMA",
>         .write          = pl011_console_write,
>         .device         = uart_console_device,
>         .setup          = pl011_console_setup,
> +       .acpi_match     = pl011_console_acpi_match,
>         .flags          = CON_PRINTBUFFER,
>         .index          = -1,
>         .data           = &amba_reg,
> diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
> index 6e28f54..ce4cb37 100644
> --- a/include/acpi/actbl2.h
> +++ b/include/acpi/actbl2.h
> @@ -371,6 +371,10 @@ struct acpi_dbg2_device {
>
>  #define ACPI_DBG2_16550_COMPATIBLE  0x0000
>  #define ACPI_DBG2_16550_SUBSET      0x0001
> +#define ACPI_DBG2_ARM_PL011         0x0003
> +#define ACPI_DBG2_ARM_SBSA_GENERIC  0x000e
> +#define ACPI_DBG2_ARM_DCC           0x000f
> +#define ACPI_DBG2_DCM2835           0x0010
>
>  #define ACPI_DBG2_1394_STANDARD     0x0000
>
> --
> 2.7.0
>



-- 
With Best Regards,
Andy Shevchenko