linux-kernel - [PATCH 3/9] spi: tegra114: move to generic dma DT binding

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Message-ID: <1374639002-16753-4-git-send-email-rizhao@nvidia.com>
Date:	Wed, 24 Jul 2013 12:09:56 +0800
From:	Richard Zhao <rizhao@...dia.com>
To:	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-spi@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<alsa-devel@...a-project.org>
CC:	<grant.likely@...aro.org>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <swarren@...dotorg.org>, <vinod.koul@...el.com>,
	<djbw@...com>, <broonie@...nel.org>, <gregkh@...uxfoundation.org>,
	<lgirdwood@...il.com>, <rizhao@...dia.com>, <linuxzsc@...il.com>,
	<ldewangan@...dia.com>, <dev@...xeye.de>
Subject: [PATCH 3/9] spi: tegra114: move to generic dma DT binding

- 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@...dia.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@...0d600 {
 	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);
-- 
1.8.1.5

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