[PATCH 13/17] spi/atmel_spi: add function to read the spi data from the dts
From: Wenyou Yang <hidden>
Date: 2012-11-12 08:52:33
Also in:
linux-arm-kernel, linux-spi
Subsystem:
microchip spi driver, open firmware and flattened device tree bindings, spi subsystem, the rest · Maintainers:
Ryan Wanner, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Mark Brown, Linus Torvalds
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 <redacted> Cc: grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org Cc: rob-VoJi6FS/r0vR7s880joybQ@public.gmane.org Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Cc: linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org --- .../devicetree/bindings/spi/spi_atmel.txt | 4 +++ drivers/spi/spi-atmel.c | 28 ++++++++++++++++++++ 2 files changed, 32 insertions(+)
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));
--
1.7.9.5
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