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spi/omap: Add DT support to McSPI driver 

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-cousson@ti.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Benoit Cousson 2012-02-15 18:37:34 +01:00 committed by Grant Likely
parent 14af60b6fb
commit d5a8003135
2 changed files with 68 additions and 8 deletions
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20
Documentation/devicetree/bindings/spi/omap-spi.txt Normal file
View File

@ -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>;
};

56
drivers/spi/spi-omap2-mcspi.c
View File

@ -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),
};