linux-kernel - Re: [PATCH v3 1/3] tegra, serial8250: add ->handle_break() uart

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Date:	Tue, 10 Apr 2012 10:51:36 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	gregkh@...uxfoundation.org,
	Sudhakar Mamillapalli <sudhakar@...com>,
	Stephen Warren <swarren@...dia.com>,
	linux-kernel@...r.kernel.org, ArndBergmannarnd@...db.de,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-serial@...r.kernel.org, Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Nhan H Mai <nhan.h.mai@...el.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH v3 1/3] tegra, serial8250: add ->handle_break() uart_port op

On Monday 09 April 2012, Dan Williams wrote:
> The "KT" serial port has another use case for a "received break" quirk,
> so before adding another special case to the 8250 core take this
> opportunity to push such quirks out of the core and into a uart_port op.
> 
> Stephen says:
> "If the callback function is to no longer live in 8250.c itself,
>  arch/arm/mach-tegra/devices.c isn't logically a good place to put it,
>  and that file will be going away once we get rid of all the board files
>  and move solely to device tree."
> 
> ...so since 8250_pci.c houses all the quirks for pci serial devices this
> quirk is similarly housed in of_serial.c.  Once the open firmware
> conversion completes the infrastructure details (CONFIG_TEGRA_SERIAL,
> include/linux/of_serial.h, and the export) can all be removed to make
> this self contained to of_serial.c.

Looks much better to me, thanks!

Acked-by: Arnd Bergmann <arnd@...db.de>

> @@ -81,7 +83,9 @@ static struct platform_device trimslice_audio_device = {
>  };
>  
>  static struct platform_device *trimslice_devices[] __initdata = {
> +#if IS_ENABLED(CONFIG_SERIAL_TEGRA)
>  	&debug_uart,
> +#endif
>  	&tegra_sdhci_device1,
>  	&tegra_sdhci_device4,
>  	&tegra_i2s_device1,

FWIW, I'd prefer to see this without the #if, I generally think the devices
that are present should not depend on the drivers that are built into the
kernel. However, since this code is going away soon, I don't care all that
much about it.

	Arnd
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