spi: sh-msiof: SIFCTR bitfield conversion

Convert MSIOF FIFO Control Register field accesses to use the
FIELD_PREP() bitfield access macro.

This gets rid of explicit shifts and custom field preparation macros.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/0bf4c366381a8999c9755285272897300852bc18.1747401908.git.geert+renesas@glider.be
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: geertu

drivers/spi/spi-sh-msiof.c

@@ -135,30 +135,26 @@ struct sh_msiof_spi_priv {
 #define SICTR_RXRST		BIT(0)		/* Receive Reset */
 
 /* SIFCTR */
-#define SIFCTR_TFWM_MASK	GENMASK(31, 29)	/* Transmit FIFO Watermark */
-#define SIFCTR_TFWM_64		(0UL << 29)	/*  Transfer Request when 64 empty stages */
-#define SIFCTR_TFWM_32		(1UL << 29)	/*  Transfer Request when 32 empty stages */
-#define SIFCTR_TFWM_24		(2UL << 29)	/*  Transfer Request when 24 empty stages */
-#define SIFCTR_TFWM_16		(3UL << 29)	/*  Transfer Request when 16 empty stages */
-#define SIFCTR_TFWM_12		(4UL << 29)	/*  Transfer Request when 12 empty stages */
-#define SIFCTR_TFWM_8		(5UL << 29)	/*  Transfer Request when 8 empty stages */
-#define SIFCTR_TFWM_4		(6UL << 29)	/*  Transfer Request when 4 empty stages */
-#define SIFCTR_TFWM_1		(7UL << 29)	/*  Transfer Request when 1 empty stage */
-#define SIFCTR_TFUA_MASK	GENMASK(26, 20) /* Transmit FIFO Usable Area */
-#define SIFCTR_TFUA_SHIFT	20
-#define SIFCTR_TFUA(i)		((i) << SIFCTR_TFUA_SHIFT)
-#define SIFCTR_RFWM_MASK	GENMASK(15, 13)	/* Receive FIFO Watermark */
-#define SIFCTR_RFWM_1		(0 << 13)	/*  Transfer Request when 1 valid stages */
-#define SIFCTR_RFWM_4		(1 << 13)	/*  Transfer Request when 4 valid stages */
-#define SIFCTR_RFWM_8		(2 << 13)	/*  Transfer Request when 8 valid stages */
-#define SIFCTR_RFWM_16		(3 << 13)	/*  Transfer Request when 16 valid stages */
-#define SIFCTR_RFWM_32		(4 << 13)	/*  Transfer Request when 32 valid stages */
-#define SIFCTR_RFWM_64		(5 << 13)	/*  Transfer Request when 64 valid stages */
-#define SIFCTR_RFWM_128		(6 << 13)	/*  Transfer Request when 128 valid stages */
-#define SIFCTR_RFWM_256		(7 << 13)	/*  Transfer Request when 256 valid stages */
-#define SIFCTR_RFUA_MASK	GENMASK(12, 4)	/* Receive FIFO Usable Area (0x40 = full) */
-#define SIFCTR_RFUA_SHIFT	4
-#define SIFCTR_RFUA(i)		((i) << SIFCTR_RFUA_SHIFT)
+#define SIFCTR_TFWM		GENMASK(31, 29)	/* Transmit FIFO Watermark */
+#define SIFCTR_TFWM_64		0U		/*  Transfer Request when 64 empty stages */
+#define SIFCTR_TFWM_32		1U		/*  Transfer Request when 32 empty stages */
+#define SIFCTR_TFWM_24		2U		/*  Transfer Request when 24 empty stages */
+#define SIFCTR_TFWM_16		3U		/*  Transfer Request when 16 empty stages */
+#define SIFCTR_TFWM_12		4U		/*  Transfer Request when 12 empty stages */
+#define SIFCTR_TFWM_8		5U		/*  Transfer Request when 8 empty stages */
+#define SIFCTR_TFWM_4		6U		/*  Transfer Request when 4 empty stages */
+#define SIFCTR_TFWM_1		7U		/*  Transfer Request when 1 empty stage */
+#define SIFCTR_TFUA		GENMASK(26, 20) /* Transmit FIFO Usable Area */
+#define SIFCTR_RFWM		GENMASK(15, 13)	/* Receive FIFO Watermark */
+#define SIFCTR_RFWM_1		0U		/*  Transfer Request when 1 valid stages */
+#define SIFCTR_RFWM_4		1U		/*  Transfer Request when 4 valid stages */
+#define SIFCTR_RFWM_8		2U		/*  Transfer Request when 8 valid stages */
+#define SIFCTR_RFWM_16		3U		/*  Transfer Request when 16 valid stages */
+#define SIFCTR_RFWM_32		4U		/*  Transfer Request when 32 valid stages */
+#define SIFCTR_RFWM_64		5U		/*  Transfer Request when 64 valid stages */
+#define SIFCTR_RFWM_128		6U		/*  Transfer Request when 128 valid stages */
+#define SIFCTR_RFWM_256		7U		/*  Transfer Request when 256 valid stages */
+#define SIFCTR_RFUA		GENMASK(12, 4)	/* Receive FIFO Usable Area (0x40 = full) */
 
 /* SISTR */
 #define SISTR_TFEMP		BIT(29) /* Transmit FIFO Empty */
@@ -811,7 +807,9 @@ static int sh_msiof_dma_once(struct sh_msiof_spi_priv *p, const void *tx,
 	}
 
 	/* 1 stage FIFO watermarks for DMA */
-	sh_msiof_write(p, SIFCTR, SIFCTR_TFWM_1 | SIFCTR_RFWM_1);
+	sh_msiof_write(p, SIFCTR,
+		       FIELD_PREP(SIFCTR_TFWM, SIFCTR_TFWM_1) |
+		       FIELD_PREP(SIFCTR_RFWM, SIFCTR_RFWM_1));
 
 	/* setup msiof transfer mode registers (32-bit words) */
 	sh_msiof_spi_set_mode_regs(p, tx, rx, 32, len / 4);