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authorRoland Stigge <stigge@antcom.de>2012-09-18 15:53:53 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-09-25 07:06:16 -0400
commit39a6ac11df6579df0361922f05c43f0fac8daa37 (patch)
tree6e8838fc000f9ff56d3f09e9beeb8ea561455e16 /drivers/spi
parent5bee3b94d945851d6cb624a5e6808d9a815ebca0 (diff)
downloadlinux-linaro-stable-39a6ac11df6579df0361922f05c43f0fac8daa37.tar.gz
spi/pl022: Devicetree support w/o platform data
Even with devicetree support, we needed platform data to provide some data, leading to mixed device tree and platform data. This patch makes it possible to provide all that information via device tree. Now, the data must be provided via platform data _or_ device tree completely. Only in case of DMA where a callback specification is necessary (dma_filter()), platform data is the only option. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-pl022.c39
1 files changed, 34 insertions, 5 deletions
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index b6cfb7b3a599..3f2f36c79ab8 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -2029,6 +2029,34 @@ static void pl022_cleanup(struct spi_device *spi)
kfree(chip);
}
+static struct pl022_ssp_controller *
+pl022_platform_data_dt_get(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct pl022_ssp_controller *pd;
+ u32 tmp;
+
+ if (!np) {
+ dev_err(dev, "no dt node defined\n");
+ return NULL;
+ }
+
+ pd = devm_kzalloc(dev, sizeof(struct pl022_ssp_controller), GFP_KERNEL);
+ if (!pd) {
+ dev_err(dev, "cannot allocate platform data memory\n");
+ return NULL;
+ }
+
+ pd->bus_id = -1;
+ of_property_read_u32(np, "num-cs", &tmp);
+ pd->num_chipselect = tmp;
+ of_property_read_u32(np, "pl022,autosuspend-delay",
+ &pd->autosuspend_delay);
+ pd->rt = of_property_read_bool(np, "pl022,rt");
+
+ return pd;
+}
+
static int __devinit
pl022_probe(struct amba_device *adev, const struct amba_id *id)
{
@@ -2041,18 +2069,19 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
dev_info(&adev->dev,
"ARM PL022 driver, device ID: 0x%08x\n", adev->periphid);
- if (platform_info == NULL) {
- dev_err(&adev->dev, "probe - no platform data supplied\n");
+ if (!platform_info && IS_ENABLED(CONFIG_OF))
+ platform_info = pl022_platform_data_dt_get(dev);
+
+ if (!platform_info) {
+ dev_err(dev, "probe: no platform data defined\n");
status = -ENODEV;
goto err_no_pdata;
}
if (platform_info->num_chipselect) {
num_cs = platform_info->num_chipselect;
- } else if (IS_ENABLED(CONFIG_OF)) {
- of_property_read_u32(np, "num-cs", &num_cs);
} else {
- dev_err(&adev->dev, "probe: no chip select defined\n");
+ dev_err(dev, "probe: no chip select defined\n");
status = -ENODEV;
goto err_no_pdata;
}