- driver: remove use of nvidia,dma-request-selector use dma_request_slave_channel to request channel - if dmas/dma-names are missing, it still supports cpu based transfer - update binding doc and specify dmas/dma-names properties as optional
Signed-off-by: Richard Zhao rizhao@nvidia.com --- .../devicetree/bindings/spi/nvidia,tegra114-spi.txt | 10 +++++++--- drivers/spi/spi-tegra114.c | 16 +++++----------- 2 files changed, 12 insertions(+), 14 deletions(-)
diff --git a/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt index 91ff771..92e1a9a 100644 --- a/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt +++ b/Documentation/devicetree/bindings/spi/nvidia,tegra114-spi.txt @@ -4,11 +4,14 @@ Required properties: - compatible : should be "nvidia,tegra114-spi". - reg: Should contain SPI registers location and length. - interrupts: Should contain SPI interrupts. -- nvidia,dma-request-selector : The Tegra DMA controller's phandle and - request selector for this SPI controller. - This is also require clock named "spi" as per binding document Documentation/devicetree/bindings/clock/clock-bindings.txt
+Optional properties: +- dmas : The Tegra DMA controller's phandle and request selector for + this SPI controller. +- dma-names : Should be "rx-tx". + Recommended properties: - spi-max-frequency: Definition as per Documentation/devicetree/bindings/spi/spi-bus.txt @@ -18,7 +21,8 @@ spi@7000d600 { compatible = "nvidia,tegra114-spi"; reg = <0x7000d600 0x200>; interrupts = <0 82 0x04>; - nvidia,dma-request-selector = <&apbdma 16>; + dmas = <&apbdma 16>; + dma-names = "rx-tx"; spi-max-frequency = <25000000>; #address-cells = <1>; #size-cells = <0>; diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index e8f542a..baff559 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -177,7 +177,7 @@ struct tegra_spi_data { void __iomem *base; phys_addr_t phys; unsigned irq; - int dma_req_sel; + bool use_dma; u32 spi_max_frequency; u32 cur_speed;
@@ -599,11 +599,8 @@ static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi, dma_addr_t dma_phys; int ret; struct dma_slave_config dma_sconfig; - dma_cap_mask_t mask;
- dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); - dma_chan = dma_request_channel(mask, NULL, NULL); + dma_chan = dma_request_slave_channel(tspi->dev, "rx-tx"); if (!dma_chan) { dev_err(tspi->dev, "Dma channel is not available, will try later\n"); @@ -618,7 +615,6 @@ static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi, return -ENOMEM; }
- dma_sconfig.slave_id = tspi->dma_req_sel; if (dma_to_memory) { dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO; dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; @@ -1012,11 +1008,9 @@ static void tegra_spi_parse_dt(struct platform_device *pdev, struct tegra_spi_data *tspi) { struct device_node *np = pdev->dev.of_node; - u32 of_dma[2];
- if (of_property_read_u32_array(np, "nvidia,dma-request-selector", - of_dma, 2) >= 0) - tspi->dma_req_sel = of_dma[1]; + if (of_find_property(np, "dmas", NULL)) + tspi->use_dma = true;
if (of_property_read_u32(np, "spi-max-frequency", &tspi->spi_max_frequency)) @@ -1093,7 +1087,7 @@ static int tegra_spi_probe(struct platform_device *pdev) tspi->max_buf_size = SPI_FIFO_DEPTH << 2; tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;
- if (tspi->dma_req_sel) { + if (tspi->use_dma) { ret = tegra_spi_init_dma_param(tspi, true); if (ret < 0) { dev_err(&pdev->dev, "RxDma Init failed, err %d\n", ret);