spi: amlogic-spifc-a1: Support per spi-mem operation frequency switches

Every ->exec_op() call correctly configures the spi bus speed to the
maximum allowed frequency for the memory using the constant spi default
parameter. Since we can now have per-operation constraints, let's use
the value that comes from the spi-mem operation structure instead. In
case there is no specific limitation for this operation, the default spi
device value will be given anyway.

The per-operation frequency capability is thus advertised to the spi-mem
core.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://patch.msgid.link/20241224-winbond-6-11-rc1-quad-support-v2-5-ad218dbc406f@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: miquelraynal

drivers/spi/spi-amlogic-spifc-a1.c

@@ -259,7 +259,7 @@ static int amlogic_spifc_a1_exec_op(struct spi_mem *mem,
 	size_t data_size = op->data.nbytes;
 	int ret;
 
-	ret = amlogic_spifc_a1_set_freq(spifc, mem->spi->max_speed_hz);
+	ret = amlogic_spifc_a1_set_freq(spifc, op->max_freq);
 	if (ret)
 		return ret;
 
@@ -320,6 +320,10 @@ static const struct spi_controller_mem_ops amlogic_spifc_a1_mem_ops = {
 	.adjust_op_size = amlogic_spifc_a1_adjust_op_size,
 };
 
+static const struct spi_controller_mem_caps amlogic_spifc_a1_mem_caps = {
+	.per_op_freq = true,
+};
+
 static int amlogic_spifc_a1_probe(struct platform_device *pdev)
 {
 	struct spi_controller *ctrl;
@@ -356,6 +360,7 @@ static int amlogic_spifc_a1_probe(struct platform_device *pdev)
 	ctrl->bits_per_word_mask = SPI_BPW_MASK(8);
 	ctrl->auto_runtime_pm = true;
 	ctrl->mem_ops = &amlogic_spifc_a1_mem_ops;
+	ctrl->mem_caps = &amlogic_spifc_a1_mem_caps;
 	ctrl->min_speed_hz = SPIFC_A1_MIN_HZ;
 	ctrl->max_speed_hz = SPIFC_A1_MAX_HZ;
 	ctrl->mode_bits = (SPI_RX_DUAL | SPI_TX_DUAL |