Add device tree support to the OMAP2+ McSPI driver.
Add the bindings documentation.
Based on original code from Rajendra.
Signed-off-by: Benoit Cousson <b-cous...@ti.com>
Cc: Grant Likely <grant.lik...@secretlab.ca>
Cc: Rajendra Nayak <rna...@ti.com>
---
Documentation/devicetree/bindings/spi/omap-spi.txt | 20 +++++++
drivers/spi/spi-omap2-mcspi.c | 56 +++++++++++++++++---
2 files changed, 68 insertions(+), 8 deletions(-)
create mode 100644 Documentation/devicetree/bindings/spi/omap-spi.txt
diff --git a/Documentation/devicetree/bindings/spi/omap-spi.txt
b/Documentation/devicetree/bindings/spi/omap-spi.txt
new file mode 100644
index 0000000..81df374
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/omap-spi.txt
@@ -0,0 +1,20 @@
+OMAP2+ McSPI device
+
+Required properties:
+- compatible :
+ - "ti,omap2-spi" for OMAP2 & OMAP3.
+ - "ti,omap4-spi" for OMAP4+.
+- ti,spi-num-cs : Number of chipselect supported by the instance.
+- ti,hwmods: Name of the hwmod associated to the McSPI
+
+
+Example:
+
+mcspi1: mcspi@1 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "ti,omap4-mcspi";
+ ti,hwmods = "mcspi1";
+ ti,spi-num-cs = <4>;
+};
+
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 0b0dfb7..bb9274c 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -34,6 +34,8 @@
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/spi/spi.h>
@@ -1079,15 +1081,39 @@ static int omap_mcspi_runtime_resume(struct device *dev)
return 0;
}
+static struct omap2_mcspi_platform_config omap2_pdata = {
+ .regs_offset = 0,
+};
+
+static struct omap2_mcspi_platform_config omap4_pdata = {
+ .regs_offset = OMAP4_MCSPI_REG_OFFSET,
+};
+
+static const struct of_device_id omap_mcspi_of_match[] = {
+ {
+ .compatible = "ti,omap2-mcspi",
+ .data = &omap2_pdata,
+ },
+ {
+ .compatible = "ti,omap4-mcspi",
+ .data = &omap4_pdata,
+ },
+ { },
+};
+MODULE_DEVICE_TABLE(of, omap_mcspi_of_match);
static int __init omap2_mcspi_probe(struct platform_device *pdev)
{
struct spi_master *master;
- struct omap2_mcspi_platform_config *pdata = pdev->dev.platform_data;
+ struct omap2_mcspi_platform_config *pdata;
struct omap2_mcspi *mcspi;
struct resource *r;
int status = 0, i;
char wq_name[20];
+ u32 regs_offset = 0;
+ static int bus_num = 1;
+ struct device_node *node = pdev->dev.of_node;
+ const struct of_device_id *match;
master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
if (master == NULL) {
@@ -1098,13 +1124,26 @@ static int __init omap2_mcspi_probe(struct
platform_device *pdev)
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
- if (pdev->id != -1)
- master->bus_num = pdev->id;
-
master->setup = omap2_mcspi_setup;
master->transfer = omap2_mcspi_transfer;
master->cleanup = omap2_mcspi_cleanup;
- master->num_chipselect = pdata->num_cs;
+ master->dev.of_node = node;
+
+ match = of_match_device(omap_mcspi_of_match, &pdev->dev);
+ if (match) {
+ u32 num_cs = 1; /* default number of chipselect */
+ pdata = match->data;
+
+ of_property_read_u32(node, "ti,spi-num-cs", &num_cs);
+ master->num_chipselect = num_cs;
+ master->bus_num = bus_num++;
+ } else {
+ pdata = pdev->dev.platform_data;
+ master->num_chipselect = pdata->num_cs;
+ if (pdev->id != -1)
+ master->bus_num = pdev->id;
+ }
+ regs_offset = pdata->regs_offset;
dev_set_drvdata(&pdev->dev, master);
@@ -1124,8 +1163,8 @@ static int __init omap2_mcspi_probe(struct
platform_device *pdev)
goto free_master;
}
- r->start += pdata->regs_offset;
- r->end += pdata->regs_offset;
+ r->start += regs_offset;
+ r->end += regs_offset;
mcspi->phys = r->start;
if (!request_mem_region(r->start, resource_size(r),
dev_name(&pdev->dev))) {
@@ -1285,7 +1324,8 @@ static struct platform_driver omap2_mcspi_driver = {
.driver = {
.name = "omap2_mcspi",
.owner = THIS_MODULE,
- .pm = &omap2_mcspi_pm_ops
+ .pm = &omap2_mcspi_pm_ops,
+ .of_match_table = omap_mcspi_of_match,
},
.remove = __exit_p(omap2_mcspi_remove),
};
--
1.7.0.4
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