linux-kernel - Re: [PATCH v4 3/3] serial: amba-pl011: add ACPI support to AMBA probe

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Date:	Mon, 4 Jan 2016 17:13:08 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	Aleksey Makarov <aleksey.makarov@...aro.org>
Cc:	linux-acpi@...r.kernel.org, Russell King <linux@....linux.org.uk>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	lkml <linux-kernel@...r.kernel.org>,
	Vladimir Zapolskiy <vz@...ia.com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 3/3] serial: amba-pl011: add ACPI support to AMBA probe

On Wed, Dec 23, 2015 at 8:19 AM, Aleksey Makarov
<aleksey.makarov@...aro.org> wrote:
> From: Graeme Gregory <graeme.gregory@...aro.org>
>
> In ACPI this device is only defined in SBSA mode so
> if we are coming from ACPI use this mode.
>
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Aleksey Makarov <aleksey.makarov@...aro.org>
> ---
>  drivers/tty/serial/amba-pl011.c | 37 ++++++++++++++++++++++++++-----------
>  1 file changed, 26 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
> index 899a771..974cb9e 100644
> --- a/drivers/tty/serial/amba-pl011.c
> +++ b/drivers/tty/serial/amba-pl011.c
> @@ -2368,18 +2368,33 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
>         if (!uap)
>                 return -ENOMEM;
>
> -       uap->clk = devm_clk_get(&dev->dev, NULL);
> -       if (IS_ERR(uap->clk))
> -               return PTR_ERR(uap->clk);
> -
> -       uap->vendor = vendor;
> -       uap->lcrh_rx = vendor->lcrh_rx;
> -       uap->lcrh_tx = vendor->lcrh_tx;
> -       uap->fifosize = vendor->get_fifosize(dev);
> -       uap->port.irq = dev->irq[0];
> -       uap->port.ops = &amba_pl011_pops;
> +       /* ACPI only defines SBSA variant */
> +       if (has_acpi_companion(&dev->dev)) {
> +               /*
> +                * According to ARM ARMH0011 is currently the only mapping
> +                * of pl011 in ACPI and it's mapped to SBSA UART mode
> +                */
> +               uap->vendor     = &vendor_sbsa;
> +               uap->fifosize   = 32;
> +               uap->port.ops   = &sbsa_uart_pops;
> +               uap->fixed_baud = 115200;

I'm confused by this patch.  We already have code like this in
tty-next, in the form of sbsa_uart_probe():

https://kernel.googlesource.com/pub/scm/linux/kernel/git/gregkh/tty/+/tty-next/drivers/tty/serial/amba-pl011.c#2553

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