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drivers: spi_nxp_lpspi: Add tristate output config

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Add DT property to configure the LPSPI instance to use tristated output
instead of retained output when PCS is negated.

Turn on the config on a couple boards for test coverage.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
This commit is contained in:
Declan Snyder 2025-01-16 11:21:06 -06:00 • committed by Benjamin Cabé
commit 31a2b4f374
5 changed files with 13 additions and 0 deletions
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1
boards/nxp/mimxrt1050_evk/mimxrt1050_evk.dtsi
View file

@ -166,6 +166,7 @@ zephyr_lcdif: &lcdif {
dma-names = "rx", "tx"; dma-names = "rx", "tx";
pinctrl-0 = <&pinmux_lpspi1>; pinctrl-0 = <&pinmux_lpspi1>;
pinctrl-names = "default"; pinctrl-names = "default";
tristate-output;
}; };
&lpspi3 { &lpspi3 {

1
boards/nxp/mimxrt1064_evk/mimxrt1064_evk.dts
View file

@ -304,6 +304,7 @@ zephyr_udc0: &usb1 {
/* DMA channels 0 and 1, muxed to LPSPI1 RX and TX */ /* DMA channels 0 and 1, muxed to LPSPI1 RX and TX */
dmas = <&edma0 0 13>, <&edma0 1 14>; dmas = <&edma0 0 13>, <&edma0 1 14>;
dma-names = "rx", "tx"; dma-names = "rx", "tx";
tristate-output;
pinctrl-0 = <&pinmux_lpspi1>; pinctrl-0 = <&pinmux_lpspi1>;
pinctrl-names = "default"; pinctrl-names = "default";
}; };

2
drivers/spi/spi_nxp_lpspi/spi_nxp_lpspi_common.c
View file

@ -89,6 +89,8 @@ int spi_mcux_configure(const struct device *dev, const struct spi_config *spi_cf
master_config.lastSckToPcsDelayInNanoSec = config->sck_pcs_delay; master_config.lastSckToPcsDelayInNanoSec = config->sck_pcs_delay;
master_config.betweenTransferDelayInNanoSec = config->transfer_delay; master_config.betweenTransferDelayInNanoSec = config->transfer_delay;
master_config.pinCfg = config->data_pin_config; master_config.pinCfg = config->data_pin_config;
master_config.dataOutConfig = config->output_config ? kLpspiDataOutTristate :
kLpspiDataOutRetained;
LPSPI_MasterInit(base, &master_config, clock_freq); LPSPI_MasterInit(base, &master_config, clock_freq);
LPSPI_SetDummyData(base, 0); LPSPI_SetDummyData(base, 0);

2
drivers/spi/spi_nxp_lpspi/spi_nxp_lpspi_priv.h
View file

@ -41,6 +41,7 @@ struct spi_mcux_config {
uint32_t transfer_delay; uint32_t transfer_delay;
const struct pinctrl_dev_config *pincfg; const struct pinctrl_dev_config *pincfg;
lpspi_pin_config_t data_pin_config; lpspi_pin_config_t data_pin_config;
bool output_config;
}; };
#ifdef CONFIG_SPI_MCUX_LPSPI_DMA #ifdef CONFIG_SPI_MCUX_LPSPI_DMA
@ -118,6 +119,7 @@ int spi_mcux_release(const struct device *dev, const struct spi_config *spi_cfg)
DT_INST_PROP(n, transfer_delay)), \ DT_INST_PROP(n, transfer_delay)), \
.pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \ .pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
.data_pin_config = DT_INST_ENUM_IDX(n, data_pin_config), \ .data_pin_config = DT_INST_ENUM_IDX(n, data_pin_config), \
.output_config = DT_INST_PROP(n, tristate_output), \
}; };
#define SPI_NXP_LPSPI_COMMON_INIT(n) \ #define SPI_NXP_LPSPI_COMMON_INIT(n) \

7
dts/bindings/spi/nxp,lpspi.yaml
View file

@ -43,3 +43,10 @@ properties:
description: | description: |
Configures which pins (SDO and SDI) are used for input and output data Configures which pins (SDO and SDI) are used for input and output data
during single bit transfers. during single bit transfers.
tristate-output:
type: boolean
description:
Configures whether or not the output data is tristated between accesses
(when PCS is negated). If set, the output will be tristated when PCS is negated,
otherwise the output line retains the last value when PCS is negated.