Input: synaptics-rmi4 - add device tree support to the SPI transport driver
Add devicetree binding for SPI devices. Signed-off-by: Andrew Duggan <aduggan@synaptics.com> Acked-by: Rob Herring <robh@kernel.org> Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Tested-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Andrew Duggan
Dmitry Torokhov
parent
8d99758dee
commit
48147b9768
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@ -0,0 +1,57 @@
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Synaptics RMI4 SPI Device Binding
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The Synaptics RMI4 core is able to support RMI4 devices using different
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transports and different functions. This file describes the device tree
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bindings for devices using the SPI transport driver. Complete documentation
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for other transports and functions can be found in
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Documentation/devicetree/bindings/input/rmi4.
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Required Properties:
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- compatible: syna,rmi4-spi
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- reg: Chip select address for the device
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- #address-cells: Set to 1 to indicate that the function child nodes
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consist of only on uint32 value.
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- #size-cells: Set to 0 to indicate that the function child nodes do not
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have a size property.
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Optional Properties:
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- interrupts: interrupt which the rmi device is connected to.
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- interrupt-parent: The interrupt controller.
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See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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- spi-rx-delay-us: microsecond delay after a read transfer.
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- spi-tx-delay-us: microsecond delay after a write transfer.
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Function Parameters:
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Parameters specific to RMI functions are contained in child nodes of the rmi device
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node. Documentation for the parameters of each function can be found in:
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Documentation/devicetree/bindings/input/rmi4/rmi_f*.txt.
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Example:
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spi@7000d800 {
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rmi4-spi-dev@0 {
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compatible = "syna,rmi4-spi";
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reg = <0x0>;
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#address-cells = <1>;
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#size-cells = <0>;
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spi-max-frequency = <4000000>;
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spi-cpha;
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spi-cpol;
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interrupt-parent = <&gpio>;
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interrupts = <TEGRA_GPIO(K, 2) 0x2>;
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spi-rx-delay-us = <30>;
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rmi4-f01@1 {
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reg = <0x1>;
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syna,nosleep-mode = <1>;
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};
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rmi4-f11@11 {
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reg = <0x11>;
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touchscreen-inverted-y;
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syna,sensor-type = <2>;
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};
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};
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};
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@ -61,6 +61,8 @@ contain the following properties.
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used for MOSI. Defaults to 1 if not present.
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- spi-rx-bus-width - (optional) The bus width(number of data wires) that
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used for MISO. Defaults to 1 if not present.
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- spi-rx-delay-us - (optional) Microsecond delay after a read transfer.
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- spi-tx-delay-us - (optional) Microsecond delay after a write transfer.
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Some SPI controllers and devices support Dual and Quad SPI transfer mode.
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It allows data in the SPI system to be transferred in 2 wires(DUAL) or 4 wires(QUAD).
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@ -13,6 +13,7 @@
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/irq.h>
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#include <linux/of.h>
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#include "rmi_driver.h"
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#define RMI_SPI_DEFAULT_XFER_BUF_SIZE 64
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@ -360,6 +361,41 @@ static int rmi_spi_init_irq(struct spi_device *spi)
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return 0;
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}
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#ifdef CONFIG_OF
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static int rmi_spi_of_probe(struct spi_device *spi,
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struct rmi_device_platform_data *pdata)
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{
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struct device *dev = &spi->dev;
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int retval;
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retval = rmi_of_property_read_u32(dev,
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&pdata->spi_data.read_delay_us,
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"spi-rx-delay-us", 1);
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if (retval)
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return retval;
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retval = rmi_of_property_read_u32(dev,
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&pdata->spi_data.write_delay_us,
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"spi-tx-delay-us", 1);
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if (retval)
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return retval;
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return 0;
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}
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static const struct of_device_id rmi_spi_of_match[] = {
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{ .compatible = "syna,rmi4-spi" },
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{},
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};
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MODULE_DEVICE_TABLE(of, rmi_spi_of_match);
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#else
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static inline int rmi_spi_of_probe(struct spi_device *spi,
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struct rmi_device_platform_data *pdata)
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{
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return -ENODEV;
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}
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#endif
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static int rmi_spi_probe(struct spi_device *spi)
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{
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struct rmi_spi_xport *rmi_spi;
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@ -377,8 +413,13 @@ static int rmi_spi_probe(struct spi_device *spi)
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pdata = &rmi_spi->xport.pdata;
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if (spi_pdata)
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if (spi->dev.of_node) {
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retval = rmi_spi_of_probe(spi, pdata);
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if (retval)
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return retval;
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} else if (spi_pdata) {
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*pdata = *spi_pdata;
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}
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if (pdata->spi_data.bits_per_word)
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spi->bits_per_word = pdata->spi_data.bits_per_word;
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@ -532,6 +573,7 @@ static struct spi_driver rmi_spi_driver = {
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.driver = {
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.name = "rmi4_spi",
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.pm = &rmi_spi_pm,
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.of_match_table = of_match_ptr(rmi_spi_of_match),
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},
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.id_table = rmi_id,
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.probe = rmi_spi_probe,
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