Even with devicetree support, we needed platform data to provide some data like
bus_id and enable_dma, 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 callback specification (dma_filter()), platform data is
necessary.
Signed-off-by: Roland Stigge <sti...@antcom.de>
---
Documentation/devicetree/bindings/spi/spi_pl022.txt | 9 ++++
drivers/spi/spi-pl022.c | 41 +++++++++++++++++---
2 files changed, 45 insertions(+), 5 deletions(-)
--- linux-2.6.orig/Documentation/devicetree/bindings/spi/spi_pl022.txt
+++ linux-2.6/Documentation/devicetree/bindings/spi/spi_pl022.txt
@@ -10,6 +10,15 @@ Optional properties:
- cs-gpios : should specify GPIOs used for chipselects.
The gpios will be referred to as reg = <index> in the SPI child nodes.
If unspecified, a single SPI device without a chip select can be used.
+- pl022,bus-id : Bus ID (0, 1, ...)
+- pl022,enable-dma : enables DMA driven transfers (boolean)
+- pl022,autosuspend-delay : delay in ms following transfer completion before
+ the runtime power management system suspends the
+ device. A setting of 0 indicates no delay and the
+ device will be suspended immediately
+- pl022,rt : indicates the controller should run the message pump with realtime
+ priority to minimise the transfer latency on the bus (boolean)
+
SPI slave nodes must be children of the SPI master node and can
contain the following properties.
--- linux-2.6.orig/drivers/spi/spi-pl022.c
+++ linux-2.6/drivers/spi/spi-pl022.c
@@ -2024,6 +2024,36 @@ static void pl022_cleanup(struct spi_dev
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;
+ }
+
+ of_property_read_u32(np, "pl022,bus-id", &tmp);
+ pd->bus_id = tmp;
+ of_property_read_u32(np, "num-cs", &tmp);
+ pd->num_chipselect = tmp;
+ pd->enable_dma = of_property_read_bool(np, "pl022,enable-dma") ? 1 : 0;
+ 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)
{
@@ -2036,18 +2066,19 @@ pl022_probe(struct amba_device *adev, co
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;
}
--
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