linux-kernel - Re: [PATCH v7 1/2] serial: sc16is7xx

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Message-ID: <alpine.LRH.2.03.1404250941590.2625@frank.harvard.edu>
Date:	Fri, 25 Apr 2014 09:44:52 -0400 (EDT)
From:	Charles Coldwell <coldwell@...il.com>
To:	Charles Coldwell <coldwell@...il.com>
cc:	jon@...gle.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	shc_work@...l.ru, Jon Ringle <jringle@...dpoint.com>
Subject: Re: [PATCH v7 1/2] serial: sc16is7xx

On Fri, 25 Apr 2014, Charles Coldwell wrote:

> On Thu, 24 Apr 2014, jon@...gle.org wrote:
> 
> > diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
> > new file mode 100644
> > index 0000000..ed139f5
> > --- /dev/null
> > +++ b/drivers/tty/serial/sc16is7xx.c
> 
> > +
> > +/* SC16IS7XX register definitions */
> > +#define SC16IS7XX_RHR_REG		(0x00) /* RX FIFO */
> > +#define SC16IS7XX_THR_REG		(0x00) /* TX FIFO */
> > +#define SC16IS7XX_IER_REG		(0x01) /* Interrupt enable */
> > +#define SC16IS7XX_IIR_REG		(0x02) /* Interrupt Identification */
> > +#define SC16IS7XX_FCR_REG		(0x02) /* FIFO control */
> > +#define SC16IS7XX_LCR_REG		(0x03) /* Line Control */
> > +#define SC16IS7XX_MCR_REG		(0x04) /* Modem Control */
> > +#define SC16IS7XX_LSR_REG		(0x05) /* Line Status */
> > +#define SC16IS7XX_MSR_REG		(0x06) /* Modem Status */
> > +#define SC16IS7XX_SPR_REG		(0x07) /* Scratch Pad */
> 
> Isn't this a lot of duplication?

Actually, the whole thing seems like duplication to me.  The SC16IS7X0 
parts are designed to be 16550-compatible (hence the duplication in the 
register map), and so I would vote for putting the driver into the 
drivers/tty/serial/8250 framework.  There's really not much difference 
between these parts and other 16550 parts except that they are reached 
over the SPI/I2C bus.

-- 
Charles M. Coldwell, W1CMC
"Turn on, log in, tune out"
Belmont, Massachusetts, New England (FN42jj)

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