Add devicetree binding for SPI devices.
Signed-off-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
---
.../devicetree/bindings/input/rmi4/rmi_spi.txt | 57 ++++++++++++++++++++++
drivers/input/rmi4/rmi_spi.c | 44 ++++++++++++++++-
2 files changed, 100 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/input/rmi4/rmi_spi.txt
diff --git a/Documentation/devicetree/bindings/input/rmi4/rmi_spi.txt b/Documentation/devicetree/bindings/input/rmi4/rmi_spi.txt
new file mode 100644
index 0000000..f20366b6
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/rmi4/rmi_spi.txt
@@ -0,0 +1,57 @@
+Synaptics RMI4 SPI Device Binding
+
+The Synaptics RMI4 core is able to support RMI4 devices using differnet
+transports and differnet functions. This file describes the device tree
+bindings for devices using the SPI tranport driver. Complete documentation
+for other transports and functions cen be found ini
+Documentation/devicetree/bindings/input/rmi4.
+
+Required Properties:
+- compatible: syna,rmi-spi
+- reg: Chip select address for the device
+- #address-cells: Set to 1 to indicate that the function child nodes
+ consist of only on uint32 value.
+- #size-cells: Set to 0 to indicate that the function child nodes do not
+ have a size property.
+
+Optional Properties:
+- interrupts: interrupt which the rmi device is connected to.
+- interrupt-parent: The interrupt controller.
+See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+- syna,spi-read-delay: millisecond delay between read byte transfers.
+- syna,spi-write-delay: millisecond delay between write byte transfers.
+
+Function Parameters:
+Parameters specific to RMI functions are contained in child nodes of the rmi device
+ node. Documentation for the parameters of each function can be found in:
+Documentation/devicetree/bindings/input/rmi4/rmi_f*.txt.
+
+
+
+Example:
+ spi@7000d800 {
+ rmi-spi-dev@0 {
+ compatible = "syna,rmi-spi";
+ reg = <0x0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <4000000>;
+ spi-cpha;
+ spi-cpol;
+ interrupt-parent = <&gpio>;
+ interrupts = <TEGRA_GPIO(K, 2) 0x2>;
+ syna,spi-read-delay = <30>;
+
+ rmi-f01@1 {
+ reg = <0x1>;
+ syna,nosleep-mode = <1>;
+ };
+
+ rmi-f11@11 {
+ reg = <0x11>;
+ syna,flip-y;
+ syna,sensor-type = <2>;
+ };
+ };
+ };
diff --git a/drivers/input/rmi4/rmi_spi.c b/drivers/input/rmi4/rmi_spi.c
index 7f9a188..9bdd9cf 100644
--- a/drivers/input/rmi4/rmi_spi.c
+++ b/drivers/input/rmi4/rmi_spi.c
@@ -12,6 +12,7 @@
#include <linux/rmi.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
+#include <linux/of.h>
#include "rmi_driver.h"
#define RMI_SPI_DEFAULT_XFER_BUF_SIZE 64
@@ -322,6 +323,41 @@ static const struct rmi_transport_ops rmi_spi_ops = {
.read_block = rmi_spi_read_block,
};
+#ifdef CONFIG_OF
+static int rmi_spi_of_probe(struct spi_device *spi,
+ struct rmi_device_platform_data *pdata)
+{
+ struct device *dev = &spi->dev;
+ int retval;
+
+ retval = rmi_of_property_read_u32(dev,
+ &pdata->spi_data.read_delay_us,
+ "syna,spi-read-delay", 1);
+ if (retval)
+ return retval;
+
+ retval = rmi_of_property_read_u32(dev,
+ &pdata->spi_data.write_delay_us,
+ "syna,spi-write-delay", 1);
+ if (retval)
+ return retval;
+
+ return 0;
+}
+
+static const struct of_device_id rmi_spi_of_match[] = {
+ { .compatible = "syna,rmi-spi" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rmi_spi_of_match);
+#else
+static inline int rmi_spi_of_probe(struct spi_device *spi,
+ struct rmi_device_platform_data *pdata)
+{
+ return -ENODEV;
+}
+#endif
+
static int rmi_spi_probe(struct spi_device *spi)
{
struct rmi_spi_xport *rmi_spi;
@@ -339,8 +375,13 @@ static int rmi_spi_probe(struct spi_device *spi)
pdata = &rmi_spi->xport.pdata;
- if (spi_pdata)
+ if (spi->dev.of_node) {
+ retval = rmi_spi_of_probe(spi, pdata);
+ if (retval)
+ return retval;
+ } else if (spi_pdata) {
*pdata = *spi_pdata;
+ }
if (pdata->spi_data.bits_per_word)
spi->bits_per_word = pdata->spi_data.bits_per_word;
@@ -407,6 +448,7 @@ static struct spi_driver rmi_spi_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "rmi_spi",
+ .of_match_table = of_match_ptr(rmi_spi_of_match),
},
.id_table = rmi_id,
.probe = rmi_spi_probe,
--
2.5.0
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