diff options
| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi_pl022.txt | 7 | ||||
| -rw-r--r-- | drivers/spi/spi-pl022.c | 39 |
2 files changed, 41 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi_pl022.txt b/Documentation/devicetree/bindings/spi/spi_pl022.txt index 877f832c30ae..f158fd31cfda 100644 --- a/Documentation/devicetree/bindings/spi/spi_pl022.txt +++ b/Documentation/devicetree/bindings/spi/spi_pl022.txt @@ -10,6 +10,13 @@ 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,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. 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; } |