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spi/davinci: add OF support for the spi controller

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This adds OF support to DaVinci SPI controller to configure platform
data through device bindings. Also replaces clk_enable() with
of clk_prepare_enable() as well as clk_disable() with
clk_disable_unprepare().

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Murali Karicheri 2012-12-11 16:20:39 -05:00 committed by Grant Likely
parent 830379e048
commit aae7147dfc
1 changed files with 88 additions and 14 deletions
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102
drivers/spi/spi-davinci.c
View file

@ -28,6 +28,8 @@
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/edma.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/slab.h>
@ -135,7 +137,7 @@ struct davinci_spi {
int dma_rx_chnum;
int dma_tx_chnum;
struct davinci_spi_platform_data *pdata;
struct davinci_spi_platform_data pdata;
void (*get_rx)(u32 rx_data, struct davinci_spi *);
u32 (*get_tx)(struct davinci_spi *);
@ -213,7 +215,7 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
bool gpio_chipsel = false;
dspi = spi_master_get_devdata(spi->master);
pdata = dspi->pdata;
pdata = &dspi->pdata;
if (pdata->chip_sel && chip_sel < pdata->num_chipselect &&
pdata->chip_sel[chip_sel] != SPI_INTERN_CS)
@ -392,7 +394,7 @@ static int davinci_spi_setup(struct spi_device *spi)
struct davinci_spi_platform_data *pdata;
dspi = spi_master_get_devdata(spi->master);
pdata = dspi->pdata;
pdata = &dspi->pdata;
/* if bits per word length is zero then set it default 8 */
if (!spi->bits_per_word)
@ -534,7 +536,7 @@ static int davinci_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
struct scatterlist sg_rx, sg_tx;
dspi = spi_master_get_devdata(spi->master);
pdata = dspi->pdata;
pdata = &dspi->pdata;
spicfg = (struct davinci_spi_config *)spi->controller_data;
if (!spicfg)
spicfg = &davinci_spi_default_cfg;
@ -758,6 +760,70 @@ static int davinci_spi_request_dma(struct davinci_spi *dspi)
return r;
}
#if defined(CONFIG_OF)
static const struct of_device_id davinci_spi_of_match[] = {
{
.compatible = "ti,dm644x-spi",
},
{
.compatible = "ti,da8xx-spi",
.data = (void *)SPI_VERSION_2,
},
{ },
};
MODULE_DEVICE_TABLE(of, davini_spi_of_match);
/**
* spi_davinci_get_pdata - Get platform data from DTS binding
* @pdev: ptr to platform data
* @dspi: ptr to driver data
*
* Parses and populates pdata in dspi from device tree bindings.
*
* NOTE: Not all platform data params are supported currently.
*/
static int spi_davinci_get_pdata(struct platform_device *pdev,
struct davinci_spi *dspi)
{
struct device_node *node = pdev->dev.of_node;
struct davinci_spi_platform_data *pdata;
unsigned int num_cs, intr_line = 0;
const struct of_device_id *match;
pdata = &dspi->pdata;
pdata->version = SPI_VERSION_1;
match = of_match_device(of_match_ptr(davinci_spi_of_match),
&pdev->dev);
if (!match)
return -ENODEV;
/* match data has the SPI version number for SPI_VERSION_2 */
if (match->data == (void *)SPI_VERSION_2)
pdata->version = SPI_VERSION_2;
/*
* default num_cs is 1 and all chipsel are internal to the chip
* indicated by chip_sel being NULL. GPIO based CS is not
* supported yet in DT bindings.
*/
num_cs = 1;
of_property_read_u32(node, "num-cs", &num_cs);
pdata->num_chipselect = num_cs;
of_property_read_u32(node, "ti,davinci-spi-intr-line", &intr_line);
pdata->intr_line = intr_line;
return 0;
}
#else
#define davinci_spi_of_match NULL
static struct davinci_spi_platform_data
*spi_davinci_get_pdata(struct platform_device *pdev,
struct davinci_spi *dspi)
{
return -ENODEV;
}
#endif
/**
* davinci_spi_probe - probe function for SPI Master Controller
* @pdev: platform_device structure which contains plateform specific data
@ -780,12 +846,6 @@ static int davinci_spi_probe(struct platform_device *pdev)
int i = 0, ret = 0;
u32 spipc0;
pdata = pdev->dev.platform_data;
if (pdata == NULL) {
ret = -ENODEV;
goto err;
}
master = spi_alloc_master(&pdev->dev, sizeof(struct davinci_spi));
if (master == NULL) {
ret = -ENOMEM;
@ -800,6 +860,19 @@ static int davinci_spi_probe(struct platform_device *pdev)
goto free_master;
}
if (pdev->dev.platform_data) {
pdata = pdev->dev.platform_data;
dspi->pdata = *pdata;
} else {
/* update dspi pdata with that from the DT */
ret = spi_davinci_get_pdata(pdev, dspi);
if (ret < 0)
goto free_master;
}
/* pdata in dspi is now updated and point pdata to that */
pdata = &dspi->pdata;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (r == NULL) {
ret = -ENOENT;
@ -807,7 +880,6 @@ static int davinci_spi_probe(struct platform_device *pdev)
}
dspi->pbase = r->start;
dspi->pdata = pdata;
mem = request_mem_region(r->start, resource_size(r), pdev->name);
if (mem == NULL) {
@ -843,8 +915,9 @@ static int davinci_spi_probe(struct platform_device *pdev)
ret = -ENODEV;
goto put_master;
}
clk_enable(dspi->clk);
clk_prepare_enable(dspi->clk);
master->dev.of_node = pdev->dev.of_node;
master->bus_num = pdev->id;
master->num_chipselect = pdata->num_chipselect;
master->setup = davinci_spi_setup;
@ -927,7 +1000,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
dma_release_channel(dspi->dma_rx);
dma_release_channel(dspi->dma_tx);
free_clk:
clk_disable(dspi->clk);
clk_disable_unprepare(dspi->clk);
clk_put(dspi->clk);
put_master:
spi_master_put(master);
@ -963,7 +1036,7 @@ static int davinci_spi_remove(struct platform_device *pdev)
spi_bitbang_stop(&dspi->bitbang);
clk_disable(dspi->clk);
clk_disable_unprepare(dspi->clk);
clk_put(dspi->clk);
spi_master_put(master);
free_irq(dspi->irq, dspi);
@ -978,6 +1051,7 @@ static struct platform_driver davinci_spi_driver = {
.driver = {
.name = "spi_davinci",
.owner = THIS_MODULE,
.of_match_table = davinci_spi_of_match,
},
.probe = davinci_spi_probe,
.remove = davinci_spi_remove,