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@xxxxxxxxx>
---
v2:
- No changes.
drivers/spi/spi-rspi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
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;
--
2.17.1
