spi: sh-msiof: Correct SIMDR2_GRPMASK

The Group Output Mask is not a single bit, but a bit field, containing
one bit for each of the four possible groups.  Correct the definition.

Note that this change has no direct impact, as the driver only uses
the first group.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/ad268d67807cb7e544eddaf7a056793482a965d4.1747401908.git.geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: geertu

drivers/spi/spi-sh-msiof.c

@@ -102,7 +102,7 @@ struct sh_msiof_spi_priv {
 /* SITMDR2 and SIRMDR2 */
 #define SIMDR2_BITLEN1		GENMASK(28, 24)	/* Data Size (8-32 bits) */
 #define SIMDR2_WDLEN1		GENMASK(23, 16)	/* Word Count (1-64/256 (SH, A1))) */
-#define SIMDR2_GRPMASK1		BIT(0)		/* Group Output Mask 1 (SH, A1) */
+#define SIMDR2_GRPMASK		GENMASK(3, 0)	/* Group Output Mask 1-4 (SH, A1) */
 
 /* SITSCR and SIRSCR */
 #define SISCR_BRPS		GENMASK(12, 8)	/* Prescaler Setting (1-32) */
@@ -400,7 +400,7 @@ static void sh_msiof_spi_set_mode_regs(struct sh_msiof_spi_priv *p,
 	if (tx_buf || (p->ctlr->flags & SPI_CONTROLLER_MUST_TX))
 		sh_msiof_write(p, SITMDR2, dr2);
 	else
-		sh_msiof_write(p, SITMDR2, dr2 | SIMDR2_GRPMASK1);
+		sh_msiof_write(p, SITMDR2, dr2 | SIMDR2_GRPMASK);
 
 	if (rx_buf)
 		sh_msiof_write(p, SIRMDR2, dr2);