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Date: Fri, 14 Mar 2014 09:55:26 +0100
From: Steffen Trumtrar <s.trumtrar@...gutronix.de>
To: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc: Mark Brown <broonie@...nel.org>, Rob Landley <rob@...dley.net>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Steffen Trumtrar <s.trumtrar@...gutronix.de>
Subject: [PATCH] spi: dw-mmio: add oftree support
Allow probing the dw-mmio from devicetree.
Signed-off-by: Steffen Trumtrar <s.trumtrar@...gutronix.de>
---
This was tested on Socfpga and v3.14-rc6
.../devicetree/bindings/spi/spi-dw-mmio.txt | 25 ++++++++++++++++++++++
drivers/spi/spi-dw-mmio.c | 19 +++++++++++++++-
2 files changed, 43 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/spi/spi-dw-mmio.txt
diff --git a/Documentation/devicetree/bindings/spi/spi-dw-mmio.txt b/Documentation/devicetree/bindings/spi/spi-dw-mmio.txt
new file mode 100644
index 0000000..2b9bb90
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi-dw-mmio.txt
@@ -0,0 +1,25 @@
+Synopsys DesignWare SPI master controller.
+
+Required properties:
+- compatible : "snps,dw-spi-mmio"
+- reg : The register base for the controller.
+- interrupts : One interrupt, used by the controller.
+- #address-cells : <1>, as required by generic SPI binding.
+- #size-cells : <0>, also as required by generic SPI binding.
+
+Optional properties:
+- num-chipselects : The number of chipselects.
+
+Child nodes as per the generic SPI binding.
+
+Example:
+
+ spi@...00000 {
+ compatible = "snps,dw-spi-mmio";
+ reg = <0xfff00000 0x1000>;
+ interrupts = <0 154 4>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ num-chipselects = <4>;
+ };
+
diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index 9af56cd..71345e4 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -16,6 +16,8 @@
#include <linux/spi/spi.h>
#include <linux/scatterlist.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include "spi-dw.h"
@@ -32,6 +34,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
struct dw_spi *dws;
struct resource *mem;
int ret;
+ int val;
dwsmmio = devm_kzalloc(&pdev->dev, sizeof(struct dw_spi_mmio),
GFP_KERNEL);
@@ -66,8 +69,15 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
if (ret)
return ret;
- dws->bus_num = 0;
+ dws->bus_num = pdev->id;
dws->num_cs = 4;
+
+ if (pdev->dev.of_node) {
+ if (of_property_read_u32(pdev->dev.of_node, "num-chipselects",
+ &val))
+ dws->num_cs = val;
+ }
+
dws->max_freq = clk_get_rate(dwsmmio->clk);
ret = dw_spi_add_host(&pdev->dev, dws);
@@ -92,12 +102,19 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id dw_spi_mmio_of_match[] = {
+ { .compatible = "snps,dw-spi-mmio", },
+ { /* end of table */}
+};
+MODULE_DEVICE_TABLE(of, dw_spi_mmio_of_match);
+
static struct platform_driver dw_spi_mmio_driver = {
.probe = dw_spi_mmio_probe,
.remove = dw_spi_mmio_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
+ .of_match_table = dw_spi_mmio_of_match,
},
};
module_platform_driver(dw_spi_mmio_driver);
--
1.9.0
--
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