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spi: imx: remove CLK calculation and check for target mode

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In target mode, the clock signal is controlled by the master. Target does
not need to check, calculate and configure the clock frequency division.
The target can directly use the root clock to sample the SCL signal.

Therefore, remove check, calculation and frequency division function of
the clock for target mode.

Signed-off-by: Carlos Song <carlos.song@nxp.com>
Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251024055211.408440-1-carlos.song@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Clark Wang
2025-10-24 13:52:11 +08:00
committed by Mark Brown
parent 2f538ef9f6
commit 55d03b5b5b
1 changed files with 18 additions and 10 deletions
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28
drivers/spi/spi-imx.c
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@@ -42,6 +42,7 @@ MODULE_PARM_DESC(polling_limit_us,
"time in us to run a transfer in polling mode\n");
#define MXC_RPM_TIMEOUT 2000 /* 2000ms */
#define MXC_SPI_DEFAULT_SPEED 500000 /* 500KHz */
#define MXC_CSPIRXDATA 0x00
#define MXC_CSPITXDATA 0x04
@@ -684,8 +685,11 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
/* set clock speed */
ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET);
ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
spi_imx->spi_bus_clk = clk;
if (!spi_imx->target_mode) {
ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
spi_imx->spi_bus_clk = clk;
}
mx51_configure_cpha(spi_imx, spi);
@@ -1308,15 +1312,18 @@ static int spi_imx_setupxfer(struct spi_device *spi,
if (!t)
return 0;
if (!t->speed_hz) {
if (!spi->max_speed_hz) {
dev_err(&spi->dev, "no speed_hz provided!\n");
return -EINVAL;
if (!spi_imx->target_mode) {
if (!t->speed_hz) {
if (!spi->max_speed_hz) {
dev_err(&spi->dev, "no speed_hz provided!\n");
return -EINVAL;
}
dev_dbg(&spi->dev, "using spi->max_speed_hz!\n");
spi_imx->spi_bus_clk = spi->max_speed_hz;
} else {
spi_imx->spi_bus_clk = t->speed_hz;
}
dev_dbg(&spi->dev, "using spi->max_speed_hz!\n");
spi_imx->spi_bus_clk = spi->max_speed_hz;
} else
spi_imx->spi_bus_clk = t->speed_hz;
}
spi_imx->bits_per_word = t->bits_per_word;
spi_imx->count = t->len;
@@ -1831,6 +1838,7 @@ static int spi_imx_probe(struct platform_device *pdev)
controller->prepare_message = spi_imx_prepare_message;
controller->unprepare_message = spi_imx_unprepare_message;
controller->target_abort = spi_imx_target_abort;
spi_imx->spi_bus_clk = MXC_SPI_DEFAULT_SPEED;
controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_NO_CS |
SPI_MOSI_IDLE_LOW;