[3/3] spi: spi-fsl-lpspi: support effective_speed_hz

Commit Message

Stefan Wahren Sept. 30, 2024, 9:30 a.m. UTC

Setting spi_transfer->effective_speed_hz in transfer_one so that
SPI client driver can use it.

Signed-off-by: Stefan Wahren <[e-mail]>
---
 drivers/spi/spi-fsl-lpspi.c | 6 ++++++
 1 file changed, 6 insertions(+)

--
2.34.1

Patch

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 3b5aa91079ae..5d55ef4d4ba6 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -92,6 +92,7 @@  struct lpspi_config {
 	u8 prescale;
 	u16 mode;
 	u32 speed_hz;
+	u32 effective_speed_hz;
 };

 struct fsl_lpspi_data {
@@ -351,6 +352,9 @@  static int fsl_lpspi_set_bitrate(struct fsl_lpspi_data *fsl_lpspi)
 	writel(scldiv | (scldiv << 8) | ((scldiv >> 1) << 16),
 					fsl_lpspi->base + IMX7ULP_CCR);

+	fsl_lpspi->config.effective_speed_hz = perclk_rate / (scldiv + 2) *
+					       (1 << prescale);
+
 	dev_dbg(fsl_lpspi->dev, "perclk=%u, speed=%u, prescale=%u, scldiv=%d\n",
 		perclk_rate, config.speed_hz, prescale, scldiv);

@@ -750,6 +754,8 @@  static int fsl_lpspi_transfer_one(struct spi_controller *controller,
 	if (ret < 0)
 		return ret;

+	t->effective_speed_hz = fsl_lpspi->config.effective_speed_hz;
+
 	fsl_lpspi_set_cmd(fsl_lpspi);
 	fsl_lpspi->is_first_byte = false;