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Message-ID: <7f9d1ffb0910122354o64b5aa01l3fe33ab78dfb5f23@mail.gmail.com> Date: Tue, 13 Oct 2009 12:24:06 +0530 From: kishore kadiyala <kishorek.kadiyala@...il.com> To: Tony Lindgren <tony@...mide.com> Cc: "G, Manjunath Kondaiah" <manjugk@...com>, Govindraj <govindraj.ti@...il.com>, "Raja, Govindraj" <govindraj.raja@...com>, "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org> Subject: Re: [PATCHv1 1/3] OMAP UART: Adds omap-serial driver support. Tony, On Fri, Oct 9, 2009 at 11:16 PM, Tony Lindgren <tony@...mide.com> wrote: > * G, Manjunath Kondaiah <manjugk@...com> [091008 00:41]: >> >> Govind, >> > -----Original Message----- >> > From: linux-omap-owner@...r.kernel.org >> > [mailto:linux-omap-owner@...r.kernel.org] On Behalf Of Govindraj >> > Sent: Thursday, October 08, 2009 11:44 AM >> > To: Tony Lindgren >> > Cc: Raja, Govindraj; linux-omap@...r.kernel.org; >> > linux-kernel@...r.kernel.org; linux-serial@...r.kernel.org >> > Subject: Re: [PATCHv1 1/3] OMAP UART: Adds omap-serial driver support. >> > >> > On Thu, Oct 8, 2009 at 3:21 AM, Tony Lindgren >> > <tony@...mide.com> wrote: >> > > * Govindraj.R <govindraj.raja@...com> [090924 03:29]: >> > >> From: Govindraj R <govindraj.raja@...com> >> > >> >> > >> This patch adds support for OMAP3430-HIGH SPEED UART Controller. >> > >> >> > >> Signed-off-by: Govindraj R <govindraj.raja@...com> >> > >> Reviewed-by: Alan Cox <alan@...rguk.ukuu.org.uk> >> > >> Reviewed-by: Tony Lindgren <tony@...mide.com> >> > > >> > > You should only add Reviewed-by if Alan or me have replied with it. >> > > >> > > So far I've only replied with some comments that have not yet >> > > been fixed, so we're few more steps from being Reviewd-by. >> > > >> > > <snip> >> > > >> > >> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig >> > >> index 6553833..67a7129 100644 >> > >> --- a/drivers/serial/Kconfig >> > >> +++ b/drivers/serial/Kconfig >> > >> @@ -1359,6 +1359,53 @@ config SERIAL_OF_PLATFORM >> > >> Currently, only 8250 compatible ports are supported, but >> > >> others can easily be added. >> > >> >> > >> +config SERIAL_OMAP >> > >> + bool "OMAP serial port support" >> > >> + depends on ARM && ARCH_OMAP >> > >> + select SERIAL_CORE >> > >> + help >> > >> + If you have a machine based on an Texas Instruments >> > OMAP CPU you >> > >> + can enable its onboard serial ports by enabling this option. >> > >> + >> > >> +config SERIAL_OMAP_CONSOLE >> > >> + bool "Console on OMAP serial port" >> > >> + depends on SERIAL_OMAP >> > >> + select SERIAL_CORE_CONSOLE >> > >> + help >> > >> + If you have enabled the serial port on the Texas >> > Instruments OMAP >> > >> + CPU you can make it the console by answering Y to >> > this option. >> > >> + >> > >> + Even if you say Y here, the currently visible virtual console >> > >> + (/dev/tty0) will still be used as the system console >> > by default, but >> > >> + you can alter that using a kernel command line option such as >> > >> + "console=ttyS0". (Try "man bootparam" or see the >> > documentation of >> > >> + your boot loader (lilo or loadlin) about how to pass >> > options to the >> > >> + kernel at boot time.) >> > >> + >> > >> +config SERIAL_OMAP_DMA_UART1 >> > >> + bool "UART1 DMA support" >> > >> + depends on SERIAL_OMAP >> > >> + help >> > >> + If you have enabled the serial port on the Texas >> > Instruments OMAP >> > >> + CPU you can enable the DMA transfer on UART 1 by answering >> > >> + to this option. >> > >> + >> > >> +config SERIAL_OMAP_DMA_UART2 >> > >> + bool "UART2 DMA support" >> > >> + depends on SERIAL_OMAP >> > >> + help >> > >> + If you have enabled the serial port on the Texas >> > Instruments OMAP >> > >> + CPU you can enable the DMA transfer on UART 2 by answering >> > >> + to this option. >> > >> + >> > >> +config SERIAL_OMAP_DMA_UART3 >> > >> + bool "UART3 DMA support" >> > >> + depends on SERIAL_OMAP >> > >> + help >> > >> + If you have enabled the serial port on the Texas >> > Instruments OMAP >> > >> + CPU you can enable the DMA transfer on UART 3 by answering >> > >> + to this option. >> > >> + >> > >> config SERIAL_OF_PLATFORM_NWPSERIAL >> > >> tristate "NWP serial port driver" >> > >> depends on PPC_OF && PPC_DCR >> > > >> > > There's absolutely no need for having Kconfig options for the DMA >> > > support. Please pass that in platform_data from the board-*.c files. >> > > >> > > This is the third time I'm commenting on the same issue! >> > > >> > > What's the point of posting these patches for review if the issues >> > > don't get solved? >> > >> > >> > The omap-serial uart driver is designed to work either in interrupt >> > mode or in DMA mode, >> > We have provided this option so that one can select interrupt mode or >> > DMA mode based on the uart usage, if somebody is using uart as console >> > then interrupt mode will do, else if used with bluetooth which does >> > huge data transfer then DMA mode can be selected. >> > >> > Don't you think this should be a configurable option using kconfig >> > rather than passing as platform data? > > Nope. I think it should be platform_data and should be possible to override > vith a kernel cmdline option. That's because we support compiling in and > booting many boards the same kernel binary. > >> > if used as platform data then one has to modify platform data to >> > switch between the interrupt and DMA mode. > > How about set some kernel cmdline options if you want to override the > default settings? Using cmdline options, will make specific UART switch dynamically between Non-DMA and DMA mode which is not handled in the driver. how abt using bootargs to share this Mode info ? > >> Usage of UART is board dependent. It's usage will not change dynamically for >> a given board. This can be removed from Kconfig and move it to respective >> board file-> board-*.c > > Or can be changed from kernel cmdline if necessary. > > Regards, > > Tony > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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