linux-kernel - Re: [PATCH 0/3] 8250: Split Fintek PCIE to UART to independent file

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Date:	Fri, 22 Jan 2016 16:23:50 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Peter Hung <hpeter@...il.com>
Cc:	Rob Groner <rgroner@....com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	gregkh@...uxfoundation.org, jslaby@...e.com,
	heikki.krogerus@...ux.intel.com, peter@...leysoftware.com,
	soeren.grunewald@...y.de, udknight@...il.com,
	adam.lee@...onical.com, arnd@...db.de,
	yamada.masahiro@...ionext.com, mans@...sr.com,
	scottwood@...escale.com, paul.burton@...tec.com,
	matthias.bgg@...il.com, manabian@...il.com, peter.ujfalusi@...com,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	peter_hong@...tek.com.tw,
	Peter Hung <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH 0/3] 8250: Split Fintek PCIE to UART to independent file

On Wed, Jan 20, 2016 at 04:24:36PM +0800, Peter Hung wrote:
> Hi Sudip,
> 
> Sudip Mukherjee 於 2016/1/20 下午 02:22 寫道:
> >On Wed, Jan 20, 2016 at 10:59:28AM +0800, Peter Hung wrote:
> 
> >But my personal opinion, if we move out the serial port related code
> >into a new driver (a new Kconfig symbol) userspace of many system will
> >break if this new symbol is not enabled by the distributions. But in the
> >way I have done the new symbol needs to be enabled only if the user
> >wants to use the GPIO capability. If that is not enabled GPIO cannot be
> >used but it will never break the serial port related code for them.
> >I think we should give a thought to that before splitting out the codes
> >from 8250_pci.
> 
> I agree with your opinion. I'm trying to implement GPIO with 2 ways,
> One is like yours, add platform_device with in 8250_pci.c and implement
> GPIOLIB platform driver with in 'driver/gpio", and the other is trying
> split out from 8250_pci.c to MFD.
> 
> In my personal opinion, the first method is less impact with compatible
> old system.

Looks like no one else is in support of our opinion. Fair enough, I will
split out the related code from 8250_pci and create the MFD driver this
weekend for my hardware.

regards
sudip