diff mbox series

[v2,7/7] spi: rspi: Fill in controller speed limits

Message ID 20200819125904.20938-8-geert+renesas@glider.be (mailing list archive)
State New, archived
Headers show
Series spi: rspi: Bit rate improvements | expand

Commit Message

Geert Uytterhoeven Aug. 19, 2020, 12:59 p.m. UTC 
Fill in the controller speed limits, so the SPI core can use them for
validating SPI transfers, and adjusting them where needed.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
v2:
  - No changes.

 drivers/spi/spi-rspi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 2b5334e22ae421b5..e39fd38f5180efb3 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -243,6 +243,8 @@  struct spi_ops {
 	int (*transfer_one)(struct spi_controller *ctlr,
 			    struct spi_device *spi, struct spi_transfer *xfer);
 	u16 extra_mode_bits;
+	u16 min_div;
+	u16 max_div;
 	u16 flags;
 	u16 fifo_size;
 	u8 num_hw_ss;
@@ -1181,6 +1183,8 @@  static int rspi_remove(struct platform_device *pdev)
 static const struct spi_ops rspi_ops = {
 	.set_config_register =	rspi_set_config_register,
 	.transfer_one =		rspi_transfer_one,
+	.min_div =		2,
+	.max_div =		4096,
 	.flags =		SPI_CONTROLLER_MUST_TX,
 	.fifo_size =		8,
 	.num_hw_ss =		2,
@@ -1189,6 +1193,8 @@  static const struct spi_ops rspi_ops = {
 static const struct spi_ops rspi_rz_ops = {
 	.set_config_register =	rspi_rz_set_config_register,
 	.transfer_one =		rspi_rz_transfer_one,
+	.min_div =		2,
+	.max_div =		4096,
 	.flags =		SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
 	.fifo_size =		8,	/* 8 for TX, 32 for RX */
 	.num_hw_ss =		1,
@@ -1199,6 +1205,8 @@  static const struct spi_ops qspi_ops = {
 	.transfer_one =		qspi_transfer_one,
 	.extra_mode_bits =	SPI_TX_DUAL | SPI_TX_QUAD |
 				SPI_RX_DUAL | SPI_RX_QUAD,
+	.min_div =		1,
+	.max_div =		4080,
 	.flags =		SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX,
 	.fifo_size =		32,
 	.num_hw_ss =		1,
@@ -1260,6 +1268,7 @@  static int rspi_probe(struct platform_device *pdev)
 	int ret;
 	const struct rspi_plat_data *rspi_pd;
 	const struct spi_ops *ops;
+	unsigned long clksrc;
 
 	ctlr = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
 	if (ctlr == NULL)
@@ -1312,6 +1321,9 @@  static int rspi_probe(struct platform_device *pdev)
 	ctlr->unprepare_message = rspi_unprepare_message;
 	ctlr->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST |
 			  SPI_LOOP | ops->extra_mode_bits;
+	clksrc = clk_get_rate(rspi->clk);
+	ctlr->min_speed_hz = DIV_ROUND_UP(clksrc, ops->max_div);
+	ctlr->max_speed_hz = DIV_ROUND_UP(clksrc, ops->min_div);
 	ctlr->flags = ops->flags;
 	ctlr->dev.of_node = pdev->dev.of_node;
 	ctlr->use_gpio_descriptors = true;