linux-kernel - Re: [RFC PATCH 3/6] serial: 8250_omap: Add support for AM654 UART controller

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Date:   Tue, 12 Jun 2018 15:06:41 -0600
From:   Rob Herring <robh@...nel.org>
To:     Nishanth Menon <nm@...com>
Cc:     Santosh Shilimkar <ssantosh@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Tony Lindgren <tony@...mide.com>, Vignesh R <vigneshr@...com>,
        Tero Kristo <t-kristo@...com>,
        Russell King <linux@...linux.org.uk>,
        Sudeep Holla <sudeep.holla@....com>,
        Sekhar Nori <nsekhar@...com>
Subject: Re: [RFC PATCH 3/6] serial: 8250_omap: Add support for AM654 UART
 controller

On Tue, Jun 05, 2018 at 01:01:22AM -0500, Nishanth Menon wrote:
> AM654 uses a UART controller that is compatible (partially) with
> existing 8250 UART, however, has a few differences with respect to DMA
> support and control paths. Introduce a base definition that allows us
> to build up the differences in follow on patches.
> 
> Cc: Sekhar Nori <nsekhar@...com>
> Cc: Vignesh R <vigneshr@...com>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
>  Documentation/devicetree/bindings/serial/omap_serial.txt | 1 +
>  drivers/tty/serial/8250/8250_omap.c                      | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/serial/omap_serial.txt b/Documentation/devicetree/bindings/serial/omap_serial.txt
> index 4b0f05adb228..c35d5ece1156 100644
> --- a/Documentation/devicetree/bindings/serial/omap_serial.txt
> +++ b/Documentation/devicetree/bindings/serial/omap_serial.txt
> @@ -1,6 +1,7 @@
>  OMAP UART controller
>  
>  Required properties:
> +- compatible : should be "ti,am654-uart" for AM654 controllers

Not compatible with any existing TI 8250 UARTs?

>  - compatible : should be "ti,omap2-uart" for OMAP2 controllers
>  - compatible : should be "ti,omap3-uart" for OMAP3 controllers
>  - compatible : should be "ti,omap4-uart" for OMAP4 controllers
> diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
> index 1b337fee07ed..a019286f8bb6 100644
> --- a/drivers/tty/serial/8250/8250_omap.c
> +++ b/drivers/tty/serial/8250/8250_omap.c
> @@ -1115,6 +1115,7 @@ static const u8 am3352_habit = OMAP_DMA_TX_KICK | UART_ERRATA_CLOCK_DISABLE;
>  static const u8 dra742_habit = UART_ERRATA_CLOCK_DISABLE;
>  
>  static const struct of_device_id omap8250_dt_ids[] = {
> +	{ .compatible = "ti,am654-uart" },
>  	{ .compatible = "ti,omap2-uart" },
>  	{ .compatible = "ti,omap3-uart" },
>  	{ .compatible = "ti,omap4-uart", .data = &omap4_habit, },
> -- 
> 2.15.1
>