The patch spi: spi-mem: stm32-qspi: add suspend/resume support has been applied to the spi tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From 2e541b64ee5269278fde5c87953a9963a8219ed4 Mon Sep 17 00:00:00 2001 From: Ludovic Barre <ludovic.barre@xxxxxx> Date: Fri, 8 Mar 2019 14:12:21 +0100 Subject: [PATCH] spi: spi-mem: stm32-qspi: add suspend/resume support This patch adds suspend and resume support for spi-stm32-qspi drivers. Signed-off-by: Ludovic Barre <ludovic.barre@xxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> --- drivers/spi/spi-stm32-qspi.c | 39 ++++++++++++++++++++++++++++++++---- 1 file changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c index 7354f9d68dba..3e8ca10011cc 100644 --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -13,6 +13,7 @@ #include <linux/mutex.h> #include <linux/of.h> #include <linux/of_device.h> +#include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/reset.h> #include <linux/sizes.h> @@ -101,6 +102,9 @@ struct stm32_qspi { struct completion data_completion; u32 fmode; + u32 cr_reg; + u32 dcr_reg; + /* * to protect device configuration, could be different between * 2 flash access (bk1, bk2) @@ -355,7 +359,7 @@ static int stm32_qspi_setup(struct spi_device *spi) struct spi_controller *ctrl = spi->master; struct stm32_qspi *qspi = spi_controller_get_devdata(ctrl); struct stm32_qspi_flash *flash; - u32 cr, presc; + u32 presc; if (ctrl->busy) return -EBUSY; @@ -371,11 +375,12 @@ static int stm32_qspi_setup(struct spi_device *spi) flash->presc = presc; mutex_lock(&qspi->lock); - cr = FIELD_PREP(CR_FTHRES_MASK, 3) | CR_SSHIFT | CR_EN; - writel_relaxed(cr, qspi->io_base + QSPI_CR); + qspi->cr_reg = FIELD_PREP(CR_FTHRES_MASK, 3) | CR_SSHIFT | CR_EN; + writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR); /* set dcr fsize to max address */ - writel_relaxed(DCR_FSIZE_MASK, qspi->io_base + QSPI_DCR); + qspi->dcr_reg = DCR_FSIZE_MASK; + writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR); mutex_unlock(&qspi->lock); return 0; @@ -489,6 +494,31 @@ static int stm32_qspi_remove(struct platform_device *pdev) return 0; } +static int __maybe_unused stm32_qspi_suspend(struct device *dev) +{ + struct stm32_qspi *qspi = dev_get_drvdata(dev); + + clk_disable_unprepare(qspi->clk); + pinctrl_pm_select_sleep_state(dev); + + return 0; +} + +static int __maybe_unused stm32_qspi_resume(struct device *dev) +{ + struct stm32_qspi *qspi = dev_get_drvdata(dev); + + pinctrl_pm_select_default_state(dev); + clk_prepare_enable(qspi->clk); + + writel_relaxed(qspi->cr_reg, qspi->io_base + QSPI_CR); + writel_relaxed(qspi->dcr_reg, qspi->io_base + QSPI_DCR); + + return 0; +} + +SIMPLE_DEV_PM_OPS(stm32_qspi_pm_ops, stm32_qspi_suspend, stm32_qspi_resume); + static const struct of_device_id stm32_qspi_match[] = { {.compatible = "st,stm32f469-qspi"}, {} @@ -501,6 +531,7 @@ static struct platform_driver stm32_qspi_driver = { .driver = { .name = "stm32-qspi", .of_match_table = stm32_qspi_match, + .pm = &stm32_qspi_pm_ops, }, }; module_platform_driver(stm32_qspi_driver); -- 2.20.1
