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[13/17] spi/atmel_spi: add function to read the spi data from the dts

Message ID 1352710357-3265-14-git-send-email-wenyou.yang@atmel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Wenyou Yang Nov. 12, 2012, 8:52 a.m. UTC 
The spi data include: dma_type and version.
dma_type to decide the SPI xfer mode: = 1(pdc), = 2(dmaengine), 0(no dma, using PIO)
version to give the SPI ip version.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Cc: grant.likely@secretlab.ca
Cc: rob@landley.net
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-doc@vger.kernel.org
Cc: spi-devel-general@lists.sourceforge.net
---
 .../devicetree/bindings/spi/spi_atmel.txt          |    4 +++
 drivers/spi/spi-atmel.c                            |   28 ++++++++++++++++++++
 2 files changed, 32 insertions(+)
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Patch

diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt b/Documentation/devicetree/bindings/spi/spi_atmel.txt
index 20cdc91..a1ceeb5 100644
--- a/Documentation/devicetree/bindings/spi/spi_atmel.txt
+++ b/Documentation/devicetree/bindings/spi/spi_atmel.txt
@@ -6,6 +6,8 @@  Required properties:
 - interrupts: Should contain macb interrupt
 - cs-gpio: Should contain the GPIOs used for chipselect.
 - dma-mask: device coherent dma mask.
+- dma_type: The dma type supported by the spi of SoC: = 0 (no used), = 1 (pdc), = 2 (dma)
+- version: The version of the spi IP.
 
 spi0: spi@f0000000 {
 	#address-cells = <1>;
@@ -19,5 +21,7 @@  spi0: spi@f0000000 {
 		    &pioB 3 0 /* conflicts with ERXDV */
 		   >;
 	dma-mask = <0xffffffff>;
+	dma_type = <1>;
+	version = <2>;
 	status = "disabled";
 };
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 568df5b..791800e 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1467,6 +1467,30 @@  static void atmel_spi_cleanup(struct spi_device *spi)
 	kfree(asd);
 }
 
+static int of_get_atmel_spi_data(struct device_node *np, struct atmel_spi *as)
+{
+	const __be32	*val;
+
+	val = of_get_property(np, "dma_type", NULL);
+	if (!val) {
+		pr_err("%s: have no 'dma_type' property\n",
+						np->full_name);
+		return -EINVAL;
+	}
+
+	as->data.dma_type = be32_to_cpup(val);
+
+	val = of_get_property(np, "version", NULL);
+	if (!val) {
+		pr_err("%s: have no 'version' property\n", np->full_name);
+		return -EINVAL;
+	}
+
+	as->data.version = be32_to_cpup(val);
+
+	return 0;
+}
+
 /*-------------------------------------------------------------------------*/
 
 static int __devinit atmel_spi_probe(struct platform_device *pdev)
@@ -1535,6 +1559,10 @@  static int __devinit atmel_spi_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_unmap_regs;
 
+	ret = of_get_atmel_spi_data(pdev->dev.of_node, as);
+	if (ret)
+		goto out_unmap_regs;
+
 	/* Initialize the hardware */
 	clk_enable(clk);
 	spi_writel(as, CR, SPI_BIT(SWRST));