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[Backport v4.3-branch] drivers: flash: stm32 qspi: Make delayed data sampling configurable #99403

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[Backport v4.3-branch] drivers: flash: stm32 qspi: Make delayed data sampling configurable #99403

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29c2583
dts: bindings: stm32 qspi: add ssht-enable property
azo-trackunit Nov 6, 2025
5b974ad
boards: stm32: set ssht-enable property on all qspi dual-flash boards
azo-trackunit Nov 6, 2025
8b35c7d
drivers: flash: stm32 qspi: Make delayed data sampling configurable
azo-trackunit Nov 6, 2025
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1 change: 1 addition & 0 deletions boards/st/stm32h745i_disco/stm32h745i_disco_stm32h745xx_m7.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,7 @@
&quadspi_bk2_io0_ph2
&quadspi_bk2_io1_ph3>;
dual-flash;
ssht-enable;
status = "okay";

mt25ql512ab1: qspi-nor-flash-1@0 {
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1 change: 1 addition & 0 deletions boards/st/stm32h747i_disco/stm32h747i_disco_stm32h747xx_m7.dts
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Expand Up @@ -251,6 +251,7 @@ zephyr_udc0: &usbotg_hs {
&quadspi_bk2_io2_pg9 &quadspi_bk2_io3_pg14>;
pinctrl-names = "default";
dual-flash;
ssht-enable;
status = "okay";

mt25ql512ab1: qspi-nor-flash-1@0 {
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1 change: 1 addition & 0 deletions boards/st/stm32h750b_dk/stm32h750b_dk-common.dtsi
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Expand Up @@ -169,6 +169,7 @@
* and accessed simultaneously, 4bits sent to/received from each.
*/
dual-flash;
ssht-enable;
status = "okay";

ext_flash_ctrl: qspi-flash-controller@0 {
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1 change: 1 addition & 0 deletions boards/st/stm32h757i_eval/stm32h757i_eval_stm32h757xx_m7.dts
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Expand Up @@ -265,6 +265,7 @@ zephyr_udc0: &usbotg_hs {
&quadspi_bk2_io2_pg9 &quadspi_bk2_io3_pg14>;
pinctrl-names = "default";
dual-flash;
ssht-enable;
status = "okay";

mt25ql512ab1: qspi-nor-flash-1@0 {
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5 changes: 3 additions & 2 deletions drivers/flash/flash_stm32_qspi.c
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Expand Up @@ -1631,7 +1631,6 @@ static int flash_stm32_qspi_init(const struct device *dev)
dev_data->hqspi.Init.ClockPrescaler = prescaler;
/* Give a bit position from 0 to 31 to the HAL init minus 1 for the DCR1 reg */
dev_data->hqspi.Init.FlashSize = find_lsb_set(dev_cfg->flash_size) - 2;
dev_data->hqspi.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_HALFCYCLE;
dev_data->hqspi.Init.ChipSelectHighTime = dev_cfg->cs_high_time - 1;
#if STM32_QSPI_DOUBLE_FLASH
dev_data->hqspi.Init.DualFlash = QSPI_DUALFLASH_ENABLE;
Expand Down Expand Up @@ -1840,7 +1839,9 @@ static struct flash_stm32_qspi_data flash_stm32_qspi_dev_data = {
.Instance = (QUADSPI_TypeDef *)DT_REG_ADDR(STM32_QSPI_NODE),
.Init = {
.FifoThreshold = STM32_QSPI_FIFO_THRESHOLD,
.SampleShifting = QSPI_SAMPLE_SHIFTING_NONE,
.SampleShifting = DT_PROP(STM32_QSPI_NODE, ssht_enable)
? QSPI_SAMPLE_SHIFTING_HALFCYCLE
: QSPI_SAMPLE_SHIFTING_NONE,
.ChipSelectHighTime = QSPI_CS_HIGH_TIME_1_CYCLE,
.ClockMode = QSPI_CLOCK_MODE_0,
},
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7 changes: 7 additions & 0 deletions dts/bindings/qspi/st,stm32-qspi.yaml
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Expand Up @@ -60,6 +60,13 @@ properties:
For example
dma-names = "tx_rx";

ssht-enable:
type: boolean
description: |
Enables Sample Shifting half-cycle.

It is recommended to be enabled in STR mode and disabled in DTR mode.

dual-flash:
type: boolean
description: |
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