spi: amd: Drop redundant check

Both spi and spi-mem cores already take care of checking the minimum and
maximum speed for transfers depending on the controller
capabilities. There is no reason to repeat this check in controller
drivers.

Once this possible error condition removed from the function, it makes
no longer sense to return an int.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://patch.msgid.link/20241224-winbond-6-11-rc1-quad-support-v2-4-ad218dbc406f@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-amd.c

@@ -298,19 +298,16 @@ static const struct amd_spi_freq amd_spi_freq[] = {
 	{ AMD_SPI_MIN_HZ,   F_800KHz,         0},
 };
 
-static int amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
+static void amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
 {
 	unsigned int i, spd7_val, alt_spd;
 
-	if (speed_hz < AMD_SPI_MIN_HZ)
-		return -EINVAL;
-
 	for (i = 0; i < ARRAY_SIZE(amd_spi_freq); i++)
 		if (speed_hz >= amd_spi_freq[i].speed_hz)
 			break;
 
 	if (amd_spi->speed_hz == amd_spi_freq[i].speed_hz)
-		return 0;
+		return;
 
 	amd_spi->speed_hz = amd_spi_freq[i].speed_hz;
 
@@ -329,8 +326,6 @@ static int amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
 		amd_spi_setclear_reg32(amd_spi, AMD_SPI_SPEED_REG, spd7_val,
 				       AMD_SPI_SPD7_MASK);
 	}
-
-	return 0;
 }
 
 static inline int amd_spi_fifo_xfer(struct amd_spi *amd_spi,
@@ -679,9 +674,7 @@ static int amd_spi_exec_mem_op(struct spi_mem *mem,
 
 	amd_spi = spi_controller_get_devdata(mem->spi->controller);
 
-	ret = amd_set_spi_freq(amd_spi, op->max_freq);
-	if (ret)
-		return ret;
+	amd_set_spi_freq(amd_spi, op->max_freq);
 
 	if (amd_spi->version == AMD_SPI_V2)
 		amd_set_spi_addr_mode(amd_spi, op);