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Define mode macros for CPOL and CPHA, and define SPI_MODE_* in terms 

of CPOL and CPHA.  Add SPI_FREQ_*() helper macros to make setting the
transfer frequency less error prone.
This commit is contained in:
thorpej 2024-02-23 23:45:54 +00:00
parent df634e507d
commit 57a3fc47c2
1 changed files with 13 additions and 5 deletions
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18
sys/dev/spi/spivar.h
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@ -1,4 +1,4 @@
/* $NetBSD: spivar.h,v 1.12 2022/01/19 13:33:11 thorpej Exp $ */
/* $NetBSD: spivar.h,v 1.13 2024/02/23 23:45:54 thorpej Exp $ */
/*-
* Copyright (c) 2006 Urbana-Champaign Independent Media Center.
@ -55,16 +55,24 @@
struct spi_handle;
struct spi_transfer;
#define SPI_MODE_CPHA __BIT(0)
#define SPI_MODE_CPOL __BIT(1)
/*
* De facto standard latching modes.
*/
#define SPI_MODE_0 0 /* CPOL = 0, CPHA = 0 */
#define SPI_MODE_1 1 /* CPOL = 0, CPHA = 1 */
#define SPI_MODE_2 2 /* CPOL = 1, CPHA = 0 */
#define SPI_MODE_3 3 /* CPOL = 1, CPHA = 1 */
#define SPI_MODE_0 0
#define SPI_MODE_1 SPI_MODE_CPHA
#define SPI_MODE_2 SPI_MODE_CPOL
#define SPI_MODE_3 (SPI_MODE_CPHA | SPI_MODE_CPOL)
/* Philips' Microwire is just Mode 0 */
#define SPI_MODE_MICROWIRE SPI_MODE_0
/* SPI transfer speed helper macros -- converts to Hz for spi_configure(). */
#define SPI_FREQ_kHz(x) ((x) * 1000)
#define SPI_FREQ_MHz(x) ((x) * 1000000)
struct spi_controller {
void *sct_cookie; /* controller private data */
int sct_nslaves;