From 8a6553ecdf976d6a34664bd491f0ea74a15aa982 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Thu, 5 Dec 2019 09:34:01 +0100 Subject: spi: stm32: Switch to use GPIO descriptors for CS This switches the STM32 SPI driver over to using GPIO descriptors for chip select. Instead of the callbacks for picking the GPIO lines using the legacy API we just let the core handle it all using descriptors. Cc: Fabien Dessenne Cc: Amelie Delaunay Cc: Cezary Gapinski Signed-off-by: Linus Walleij Link: https://lore.kernel.org/r/20191205083401.27077-1-linus.walleij@linaro.org Signed-off-by: Mark Brown --- drivers/spi/spi-stm32.c | 47 +++-------------------------------------------- 1 file changed, 3 insertions(+), 44 deletions(-) (limited to 'drivers/spi/spi-stm32.c') diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index b222ce8d083e..7d75632c4151 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -9,7 +9,6 @@ #include #include #include -#include #include #include #include @@ -973,29 +972,6 @@ static irqreturn_t stm32h7_spi_irq_thread(int irq, void *dev_id) return IRQ_HANDLED; } -/** - * stm32_spi_setup - setup device chip select - */ -static int stm32_spi_setup(struct spi_device *spi_dev) -{ - int ret = 0; - - if (!gpio_is_valid(spi_dev->cs_gpio)) { - dev_err(&spi_dev->dev, "%d is not a valid gpio\n", - spi_dev->cs_gpio); - return -EINVAL; - } - - dev_dbg(&spi_dev->dev, "%s: set gpio%d output %s\n", __func__, - spi_dev->cs_gpio, - (spi_dev->mode & SPI_CS_HIGH) ? "low" : "high"); - - ret = gpio_direction_output(spi_dev->cs_gpio, - !(spi_dev->mode & SPI_CS_HIGH)); - - return ret; -} - /** * stm32_spi_prepare_msg - set up the controller to transfer a single message */ @@ -1810,7 +1786,7 @@ static int stm32_spi_probe(struct platform_device *pdev) struct spi_master *master; struct stm32_spi *spi; struct resource *res; - int i, ret; + int ret; master = spi_alloc_master(&pdev->dev, sizeof(struct stm32_spi)); if (!master) { @@ -1898,7 +1874,7 @@ static int stm32_spi_probe(struct platform_device *pdev) master->bits_per_word_mask = spi->cfg->get_bpw_mask(spi); master->max_speed_hz = spi->clk_rate / spi->cfg->baud_rate_div_min; master->min_speed_hz = spi->clk_rate / spi->cfg->baud_rate_div_max; - master->setup = stm32_spi_setup; + master->use_gpio_descriptors = true; master->prepare_message = stm32_spi_prepare_msg; master->transfer_one = stm32_spi_transfer_one; master->unprepare_message = stm32_spi_unprepare_msg; @@ -1928,29 +1904,12 @@ static int stm32_spi_probe(struct platform_device *pdev) goto err_dma_release; } - if (!master->cs_gpios) { + if (!master->cs_gpiods) { dev_err(&pdev->dev, "no CS gpios available\n"); ret = -EINVAL; goto err_dma_release; } - for (i = 0; i < master->num_chipselect; i++) { - if (!gpio_is_valid(master->cs_gpios[i])) { - dev_err(&pdev->dev, "%i is not a valid gpio\n", - master->cs_gpios[i]); - ret = -EINVAL; - goto err_dma_release; - } - - ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i], - DRIVER_NAME); - if (ret) { - dev_err(&pdev->dev, "can't get CS gpio %i\n", - master->cs_gpios[i]); - goto err_dma_release; - } - } - dev_info(&pdev->dev, "driver initialized\n"); return 0; -- cgit From 0a454258febb73e4c60d7f5d9a02d1a8c64fdfb8 Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Thu, 12 Dec 2019 15:55:50 +0200 Subject: spi: stm32: Use dma_request_chan() instead dma_request_slave_channel() dma_request_slave_channel() is a wrapper on top of dma_request_chan() eating up the error code. By using dma_request_chan() directly the driver can support deferred probing against DMA. Signed-off-by: Peter Ujfalusi Link: https://lore.kernel.org/r/20191212135550.4634-10-peter.ujfalusi@ti.com Signed-off-by: Mark Brown --- drivers/spi/spi-stm32.c | 32 ++++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 10 deletions(-) (limited to 'drivers/spi/spi-stm32.c') diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 7d75632c4151..e041f9c4ec47 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -1879,17 +1879,29 @@ static int stm32_spi_probe(struct platform_device *pdev) master->transfer_one = stm32_spi_transfer_one; master->unprepare_message = stm32_spi_unprepare_msg; - spi->dma_tx = dma_request_slave_channel(spi->dev, "tx"); - if (!spi->dma_tx) + spi->dma_tx = dma_request_chan(spi->dev, "tx"); + if (IS_ERR(spi->dma_tx)) { + ret = PTR_ERR(spi->dma_tx); + spi->dma_tx = NULL; + if (ret == -EPROBE_DEFER) + goto err_clk_disable; + dev_warn(&pdev->dev, "failed to request tx dma channel\n"); - else + } else { master->dma_tx = spi->dma_tx; + } + + spi->dma_rx = dma_request_chan(spi->dev, "rx"); + if (IS_ERR(spi->dma_rx)) { + ret = PTR_ERR(spi->dma_rx); + spi->dma_rx = NULL; + if (ret == -EPROBE_DEFER) + goto err_dma_release; - spi->dma_rx = dma_request_slave_channel(spi->dev, "rx"); - if (!spi->dma_rx) dev_warn(&pdev->dev, "failed to request rx dma channel\n"); - else + } else { master->dma_rx = spi->dma_rx; + } if (spi->dma_tx || spi->dma_rx) master->can_dma = stm32_spi_can_dma; @@ -1901,26 +1913,26 @@ static int stm32_spi_probe(struct platform_device *pdev) if (ret) { dev_err(&pdev->dev, "spi master registration failed: %d\n", ret); - goto err_dma_release; + goto err_pm_disable; } if (!master->cs_gpiods) { dev_err(&pdev->dev, "no CS gpios available\n"); ret = -EINVAL; - goto err_dma_release; + goto err_pm_disable; } dev_info(&pdev->dev, "driver initialized\n"); return 0; +err_pm_disable: + pm_runtime_disable(&pdev->dev); err_dma_release: if (spi->dma_tx) dma_release_channel(spi->dma_tx); if (spi->dma_rx) dma_release_channel(spi->dma_rx); - - pm_runtime_disable(&pdev->dev); err_clk_disable: clk_disable_unprepare(spi->clk); err_master_put: -- cgit