Staging/iio/adc/touchscreen/MXS: provide devicetree adaption
This is an RFC for the new touchscreen properties. Signed-off-by: Juergen Beisert <jbe@pengutronix.de> Tested-by: Marek Vasut <marex@denx.de> Acked-by: Marek Vasut <marex@denx.de> Tested-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org> CC: linux-arm-kernel@lists.infradead.org CC: linux-input@vger.kernel.org CC: devel@driverdev.osuosl.org CC: Marek Vasut <marex@denx.de> CC: Fabio Estevam <fabio.estevam@freescale.com> CC: devicetree@vger.kernel.org
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@ -1,7 +1,8 @@
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* Freescale i.MX28 LRADC device driver
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Required properties:
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- compatible: Should be "fsl,imx28-lradc"
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- compatible: Should be "fsl,imx23-lradc" for i.MX23 SoC and "fsl,imx28-lradc"
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for i.MX28 SoC
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- reg: Address and length of the register set for the device
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- interrupts: Should contain the LRADC interrupts
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@ -9,13 +10,38 @@ Optional properties:
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- fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
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to LRADC. Valid value is either 4 or 5. If this
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property is not present, then the touchscreen is
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disabled.
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disabled. 5 wires is valid for i.MX28 SoC only.
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- fsl,ave-ctrl: number of samples per direction to calculate an average value.
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Allowed value is 1 ... 31, default is 4
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- fsl,ave-delay: delay between consecutive samples. Allowed value is
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1 ... 2047. It is used if 'fsl,ave-ctrl' > 1, counts at
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2 kHz and its default is 2 (= 1 ms)
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- fsl,settling: delay between plate switch to next sample. Allowed value is
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1 ... 2047. It counts at 2 kHz and its default is
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10 (= 5 ms)
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Examples:
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Example for i.MX23 SoC:
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lradc@80050000 {
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compatible = "fsl,imx23-lradc";
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reg = <0x80050000 0x2000>;
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interrupts = <36 37 38 39 40 41 42 43 44>;
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status = "okay";
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fsl,lradc-touchscreen-wires = <4>;
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fsl,ave-ctrl = <4>;
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fsl,ave-delay = <2>;
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fsl,settling = <10>;
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};
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Example for i.MX28 SoC:
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lradc@80050000 {
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compatible = "fsl,imx28-lradc";
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reg = <0x80050000 0x2000>;
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interrupts = <10 14 15 16 17 18 19
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20 21 22 23 24 25>;
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interrupts = <10 14 15 16 17 18 19 20 21 22 23 24 25>;
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status = "okay";
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fsl,lradc-touchscreen-wires = <5>;
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fsl,ave-ctrl = <4>;
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fsl,ave-delay = <2>;
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fsl,settling = <10>;
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};
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@ -183,6 +183,10 @@
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lradc@80050000 {
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status = "okay";
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fsl,lradc-touchscreen-wires = <4>;
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fsl,ave-ctrl = <4>;
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fsl,ave-delay = <2>;
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fsl,settling = <10>;
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};
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i2c0: i2c@80058000 {
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@ -1224,10 +1224,45 @@ MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
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static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
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struct device_node *lradc_node)
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{
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/* TODO retrieve from device tree */
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int ret;
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u32 ts_wires = 0, adapt;
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ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
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&ts_wires);
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if (ret)
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return -ENODEV; /* touchscreen feature disabled */
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switch (ts_wires) {
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case 4:
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lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
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break;
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case 5:
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if (lradc->soc == IMX28_LRADC) {
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lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
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break;
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}
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/* fall through an error message for i.MX23 */
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default:
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dev_err(lradc->dev,
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"Unsupported number of touchscreen wires (%d)\n",
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ts_wires);
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return -EINVAL;
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}
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lradc->over_sample_cnt = 4;
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ret = of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt);
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if (ret == 0)
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lradc->over_sample_cnt = adapt;
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lradc->over_sample_delay = 2;
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ret = of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt);
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if (ret == 0)
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lradc->over_sample_delay = adapt;
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lradc->settling_delay = 10;
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ret = of_property_read_u32(lradc_node, "fsl,settling", &adapt);
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if (ret == 0)
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lradc->settling_delay = adapt;
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return 0;
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}
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@ -1243,7 +1278,6 @@ static int mxs_lradc_probe(struct platform_device *pdev)
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struct mxs_lradc *lradc;
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struct iio_dev *iio;
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struct resource *iores;
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uint32_t ts_wires = 0;
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int ret = 0, touch_ret;
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int i;
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@ -1277,25 +1311,6 @@ static int mxs_lradc_probe(struct platform_device *pdev)
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touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
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/* Check if touchscreen is enabled in DT. */
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ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
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&ts_wires);
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if (ret)
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dev_info(dev, "Touchscreen not enabled.\n");
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else if (ts_wires == 4)
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lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
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else if (ts_wires == 5)
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lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
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else
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dev_warn(dev, "Unsupported number of touchscreen wires (%d)\n",
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ts_wires);
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if ((lradc->soc == IMX23_LRADC) && (ts_wires == 5)) {
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dev_warn(dev, "No support for 5 wire touches on i.MX23\n");
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dev_warn(dev, "Falling back to 4 wire\n");
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ts_wires = 4;
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}
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/* Grab all IRQ sources */
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for (i = 0; i < of_cfg->irq_count; i++) {
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lradc->irq[i] = platform_get_irq(pdev, i);
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