linux-kernel - Re: [PATCH v2] tty: serial: sc16is7xx

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Message-ID: <20140321082609.GA3801@xps8300>
Date:	Fri, 21 Mar 2014 10:26:09 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	jon@...gle.org
Cc:	gregkh@...uxfoundation.org, jslaby@...e.cz, shc_work@...l.ru,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org, Jon Ringle <jringle@...dpoint.com>
Subject: Re: [PATCH v2] tty: serial: sc16is7xx

Hi,

On Thu, Mar 20, 2014 at 10:05:33AM -0400, jon@...gle.org wrote:
> From: Jon Ringle <jringle@...dpoint.com>
> 
> The SC16IS7xx is a slave I2C-bus/SPI interface to a single-channel
> high performance UART. The SC16IS7xx’s internal register set is
> backward-compatible with the widely used and widely popular 16C450.

So couldn't this be just a probe driver for 8250?

> +/* 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 */

At least there should not be any need to redefine those register or
their bits. Just include serial_reg.h.

Thanks,

-- 
heikki
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