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spi: sh-msiof: Document frame start sync pulse mode

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Unused, but nice to have it documented.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/3d3acaab4a4125106a0655d28c09c050341c5eeb.1747401908.git.geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>
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Geert Uytterhoeven 2025-05-16 15:32:23 +02:00 committed by Mark Brown
parent acb47aa9b1
commit 8f836868d8
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drivers/spi/spi-sh-msiof.c
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@ -86,6 +86,7 @@ struct sh_msiof_spi_priv {
/* SITMDR1 and SIRMDR1 */
#define SIMDR1_TRMD BIT(31) /* Transfer Mode (1 = Master mode) */
#define SIMDR1_SYNCMD GENMASK(29, 28) /* SYNC Mode */
#define SIMDR1_SYNCMD_PULSE 0U /* Frame start sync pulse */
#define SIMDR1_SYNCMD_SPI 2U /* Level mode/SPI */
#define SIMDR1_SYNCMD_LR 3U /* L/R mode */
#define SIMDR1_SYNCAC BIT(25) /* Sync Polarity (1 = Active-low) */