Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751853Ab3GXELH (ORCPT ); Wed, 24 Jul 2013 00:11:07 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:8520 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750906Ab3GXEKO (ORCPT ); Wed, 24 Jul 2013 00:10:14 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Tue, 23 Jul 2013 21:09:05 -0700 From: Richard Zhao To: , , , , , , , CC: , , , , , , , , , , , , Subject: [PATCH 4/9] spi: tegra20-slink: move to generic dma DT binding Date: Wed, 24 Jul 2013 12:09:57 +0800 Message-ID: <1374639002-16753-5-git-send-email-rizhao@nvidia.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1374639002-16753-1-git-send-email-rizhao@nvidia.com> References: <1374639002-16753-1-git-send-email-rizhao@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3923 Lines: 104 - 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 --- .../devicetree/bindings/spi/nvidia,tegra20-slink.txt | 10 +++++++--- drivers/spi/spi-tegra20-slink.c | 16 +++++----------- 2 files changed, 12 insertions(+), 14 deletions(-) diff --git a/Documentation/devicetree/bindings/spi/nvidia,tegra20-slink.txt b/Documentation/devicetree/bindings/spi/nvidia,tegra20-slink.txt index eefe15e..ae43bd1 100644 --- a/Documentation/devicetree/bindings/spi/nvidia,tegra20-slink.txt +++ b/Documentation/devicetree/bindings/spi/nvidia,tegra20-slink.txt @@ -4,8 +4,11 @@ Required properties: - compatible : should be "nvidia,tegra20-slink", "nvidia,tegra30-slink". - reg: Should contain SLINK registers location and length. - interrupts: Should contain SLINK interrupts. -- nvidia,dma-request-selector : The Tegra DMA controller's phandle and - request selector for this SLINK controller. + +Optional properties: +- dmas : The Tegra DMA controller's phandle and request selector for + this SLINK controller. +- dma-names : Should be "rx-tx". Recommended properties: - spi-max-frequency: Definition as per @@ -17,7 +20,8 @@ spi@7000d600 { compatible = "nvidia,tegra20-slink"; 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-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c index 80490cc..278fb04 100644 --- a/drivers/spi/spi-tegra20-slink.c +++ b/drivers/spi/spi-tegra20-slink.c @@ -170,7 +170,7 @@ struct tegra_slink_data { void __iomem *base; phys_addr_t phys; unsigned irq; - int dma_req_sel; + bool use_dma; u32 spi_max_frequency; u32 cur_speed; @@ -629,11 +629,8 @@ static int tegra_slink_init_dma_param(struct tegra_slink_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"); @@ -648,7 +645,6 @@ static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi, return -ENOMEM; } - dma_sconfig.slave_id = tspi->dma_req_sel; if (dma_to_memory) { dma_sconfig.src_addr = tspi->phys + SLINK_RX_FIFO; dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; @@ -1034,11 +1030,9 @@ static irqreturn_t tegra_slink_isr(int irq, void *context_data) static void tegra_slink_parse_dt(struct tegra_slink_data *tspi) { struct device_node *np = tspi->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)) @@ -1132,7 +1126,7 @@ static int tegra_slink_probe(struct platform_device *pdev) tspi->max_buf_size = SLINK_FIFO_DEPTH << 2; tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN; - if (tspi->dma_req_sel) { + if (tspi->use_dma) { ret = tegra_slink_init_dma_param(tspi, true); if (ret < 0) { dev_err(&pdev->dev, "RxDma Init failed, err %d\n", ret); -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/