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serial: sh-sci: Add more Serial Port Control/Data Register documentation

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Improve documentation for the SCIFA/SCIFB Serial Port Control and Data
Registers:
  - State clearly that the RTS and CTS lines are active-low,
  - Document the bits related to the serial port's SCK, RXD, and TXD
    pins.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2016-06-03 12:00:07 +02:00 committed by Greg Kroah-Hartman
parent ef5e90e8cc
commit 4780c09f7a
1 changed files with 10 additions and 4 deletions
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14
drivers/tty/serial/sh-sci.h
View file

@ -121,12 +121,18 @@ enum {
#define HSCIF_SRE BIT(15) /* Sampling Rate Register Enable */ #define HSCIF_SRE BIT(15) /* Sampling Rate Register Enable */
/* SCPCR (Serial Port Control Register), SCIFA/SCIFB only */ /* SCPCR (Serial Port Control Register), SCIFA/SCIFB only */
#define SCPCR_RTSC BIT(4) /* Serial Port RTS Pin / Output Pin */ #define SCPCR_RTSC BIT(4) /* Serial Port RTS# Pin / Output Pin */
#define SCPCR_CTSC BIT(3) /* Serial Port CTS Pin / Input Pin */ #define SCPCR_CTSC BIT(3) /* Serial Port CTS# Pin / Input Pin */
#define SCPCR_SCKC BIT(2) /* Serial Port SCK Pin / Output Pin */
#define SCPCR_RXDC BIT(1) /* Serial Port RXD Pin / Input Pin */
#define SCPCR_TXDC BIT(0) /* Serial Port TXD Pin / Output Pin */
/* SCPDR (Serial Port Data Register), SCIFA/SCIFB only */ /* SCPDR (Serial Port Data Register), SCIFA/SCIFB only */
#define SCPDR_RTSD BIT(4) /* Serial Port RTS Output Pin Data */ #define SCPDR_RTSD BIT(4) /* Serial Port RTS# Output Pin Data */
#define SCPDR_CTSD BIT(3) /* Serial Port CTS Input Pin Data */ #define SCPDR_CTSD BIT(3) /* Serial Port CTS# Input Pin Data */
#define SCPDR_SCKD BIT(2) /* Serial Port SCK Output Pin Data */
#define SCPDR_RXDD BIT(1) /* Serial Port RXD Input Pin Data */
#define SCPDR_TXDD BIT(0) /* Serial Port TXD Output Pin Data */
/* /*
* BRG Clock Select Register (Some SCIF and HSCIF) * BRG Clock Select Register (Some SCIF and HSCIF)