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Message-ID: <E0D41E29EB0DAC4E9F3FF173962E9E940253C6C560@dbde02.ent.ti.com> Date: Thu, 8 Oct 2009 13:11:32 +0530 From: "G, Manjunath Kondaiah" <manjugk@...com> To: Govindraj <govindraj.ti@...il.com>, Tony Lindgren <tony@...mide.com> CC: "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. 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? > > if used as platform data then one has to modify platform data to > switch between the interrupt and DMA mode. > > Regards, > Govindraj.R > > 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 > > > > Regards, > > > > Tony > > -- > > To unsubscribe from this list: send the line "unsubscribe > linux-serial" 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-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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