On Mon, Jan 13, 2014 at 10:17:04AM +0000, Lothar Waßmann wrote:
> This patch allows the edt-ft5x06 multitouch panel driver to be
> configured via DT.
>
> Signed-off-by: Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx>
> ---
> .../bindings/input/touchscreen/edt-ft5x06.txt | 31 ++++
> drivers/input/touchscreen/edt-ft5x06.c | 145 +++++++++++++++----
> 2 files changed, 145 insertions(+), 31 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> new file mode 100644
> index 0000000..629dbdd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
> @@ -0,0 +1,31 @@
> +* EDT FT5x06 Multiple Touch Controller
> +
> +Required properties:
> +- compatible: must be "edt,ft5x06"
> +- reg: i2c slave address
> +- interrupt-parent: the phandle for the interrupt controller
> +- interrupts: touch controller interrupt
> +
> +Optional properties:
> +- reset-gpios: the gpio pin to be used for resetting the controller
> +- wakeup-gpios: the gpio pin to be used for waking up the controller
> +
> + The following properties provide default values for the
> + corresponding parameters configurable via sysfs
> + (see Documentation/input/edt-ft5x06.txt)
The sysfs interface shouldn't matter for the binding, it's a Linux
detail. There's no reason for it to be mentioned in the binding.
> +- threshold: allows setting the "click"-threshold in the range from 20 to 80.
> +- gain: sensitivity (0..31) (lower value -> higher sensitivity)
> +- offset: edge compensation (0..31)
> +- report_rate: report rate (3..14)
s/_/-/ on property names please. Also, it may make sense to prefix these
as they're rather generic sounding names.
Could you elaborate on these a litle please? What units are each of
these in? Why does it make sense to have them in the dt?
> +
> +Example:
> +
> + edt_ft5x06@38 {
> + compatible = "edt,ft5x06";
> + reg = <0x38>;
> + interrupt-parent = <&gpio2>;
> + interrupts = <5 0>;
> + wakeup-gpios = <&gpio1 9 0>;
> + reset-gpios = <&gpio2 6 1>;
> + wakeup-gpios = <&gpio4 9 0>;
> + };
One of those wakeup-gpios properties should go.
[...]
> +#define EDT_GET_PROP(name, reg) { \
> + const u32 *prop = of_get_property(np, #name, NULL); \
> + if (prop) \
> + edt_ft5x06_register_write(tsdata, reg, be32_to_cpu(*prop)); \
> +}
Use of_property_read_u32, which does endianness conversion and property
length checking (which you're not doing). Sparse _will_ complain here
because you've not maintained the __be32 annotation.
> +static void edt_ft5x06_ts_get_dt_defaults(struct device_node *np,
> + struct edt_ft5x06_ts_data *tsdata)
> +{
> + EDT_GET_PROP(threshold, WORK_REGISTER_THRESHOLD);
> + EDT_GET_PROP(gain, WORK_REGISTER_GAIN);
> + EDT_GET_PROP(offset, WORK_REGISTER_OFFSET);
> + EDT_GET_PROP(report_rate, WORK_REGISTER_REPORT_RATE);
These should probably have sanity checks given you've described valid
ranges in the documentation.
[...]
> +static int edt_ft5x06_i2c_ts_probe_dt(struct device *dev,
> + struct edt_ft5x06_ts_data *tsdata)
> +{
> + int ret;
> + struct device_node *np = dev->of_node;
> + enum of_gpio_flags gpio_flags;
> +
> + if (!np)
> + return -ENODEV;
> +
> + /*
> + * irq_pin is not needed for DT setup.
> + * irq is associated via 'interrupts' property in DT
> + */
> + tsdata->irq_pin = -EINVAL;
> +
> + ret = of_get_named_gpio_flags(np, "reset-gpios", 0, &gpio_flags);
> + tsdata->reset_pin = ret;
> +
> + ret = of_get_named_gpio_flags(np, "wake-gpios", 0, &gpio_flags);
> + tsdata->wake_pin = ret;
Shouldn't that be "wakeup-gpios"?
Do you not need the value of flags? I'm not that familiar with the GPIO
subsystem, and it feels odd to rtequest the flags and throw them away.
Thanks,
Mark.
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