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spi: stm32-ospi: Make usage of reset_control_acquire/release() API

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As ospi reset is consumed by both OMM and OSPI drivers, use the reset
acquire/release mechanism which ensure exclusive reset usage.

This avoid to call reset_control_get/put() in OMM driver each time
we need to reset OSPI children and guarantee the reset line stays
deasserted.

During resume, OMM driver takes temporarily control of reset.

Fixes: 79b8a705e2 ("spi: stm32: Add OSPI driver")
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://patch.msgid.link/20250609-b4-upstream_ospi_reset_update-v6-1-5b602b567e8a@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Patrice Chotard 2025-06-09 17:05:04 +02:00 • committed by Mark Brown
parent e51a086117
commit cf2c3eceb7
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GPG key ID: 24D68B725D5487D0
1 changed files with 18 additions and 6 deletions
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24
drivers/spi/spi-stm32-ospi.c
View file

@ -804,7 +804,7 @@ static int stm32_ospi_get_resources(struct platform_device *pdev)
return ret;
}
ospi->rstc = devm_reset_control_array_get_exclusive(dev);
ospi->rstc = devm_reset_control_array_get_exclusive_released(dev);
if (IS_ERR(ospi->rstc))
return dev_err_probe(dev, PTR_ERR(ospi->rstc),
"Can't get reset\n");
@ -936,11 +936,13 @@ static int stm32_ospi_probe(struct platform_device *pdev)
if (ret < 0)
goto err_pm_enable;
if (ospi->rstc) {
reset_control_assert(ospi->rstc);
udelay(2);
reset_control_deassert(ospi->rstc);
}
ret = reset_control_acquire(ospi->rstc);
if (ret)
return dev_err_probe(dev, ret, "Can not acquire reset %d\n", ret);
reset_control_assert(ospi->rstc);
udelay(2);
reset_control_deassert(ospi->rstc);
ret = spi_register_controller(ctrl);
if (ret) {
@ -987,6 +989,8 @@ static void stm32_ospi_remove(struct platform_device *pdev)
if (ospi->dma_chrx)
dma_release_channel(ospi->dma_chrx);
reset_control_release(ospi->rstc);
pm_runtime_put_sync_suspend(ospi->dev);
pm_runtime_force_suspend(ospi->dev);
}
@ -997,6 +1001,8 @@ static int __maybe_unused stm32_ospi_suspend(struct device *dev)
pinctrl_pm_select_sleep_state(dev);
reset_control_release(ospi->rstc);
return pm_runtime_force_suspend(ospi->dev);
}
@ -1016,6 +1022,12 @@ static int __maybe_unused stm32_ospi_resume(struct device *dev)
if (ret < 0)
return ret;
ret = reset_control_acquire(ospi->rstc);
if (ret) {
dev_err(dev, "Can not acquire reset\n");
return ret;
}
writel_relaxed(ospi->cr_reg, regs_base + OSPI_CR);
writel_relaxed(ospi->dcr_reg, regs_base + OSPI_DCR1);
pm_runtime_mark_last_busy(ospi->dev);