IIO: AT91: Add DT support to at91_adc driver
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Maxime Ripard
Greg Kroah-Hartman
parent
5d449e4b2f
commit
e364185f3e
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@ -0,0 +1,65 @@
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* AT91's Analog to Digital Converter (ADC)
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Required properties:
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- compatible: Should be "atmel,at91sam9260-adc"
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- reg: Should contain ADC registers location and length
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- interrupts: Should contain the IRQ line for the ADC
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- atmel,adc-channel-base: Offset of the first channel data register
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- atmel,adc-channels-used: Bitmask of the channels muxed and enable for this
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device
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- atmel,adc-drdy-mask: Mask of the DRDY interruption in the ADC
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- atmel,adc-num-channels: Number of channels available in the ADC
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- atmel,adc-startup-time: Startup Time of the ADC in microseconds as
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defined in the datasheet
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- atmel,adc-status-register: Offset of the Interrupt Status Register
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- atmel,adc-trigger-register: Offset of the Trigger Register
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- atmel,adc-vref: Reference voltage in millivolts for the conversions
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Optional properties:
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- atmel,adc-use-external: Boolean to enable of external triggers
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Optional trigger Nodes:
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- Required properties:
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* trigger-name: Name of the trigger exposed to the user
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* trigger-value: Value to put in the Trigger register
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to activate this trigger
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- Optional properties:
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* trigger-external: Is the trigger an external trigger?
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Examples:
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adc0: adc@fffb0000 {
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compatible = "atmel,at91sam9260-adc";
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reg = <0xfffb0000 0x100>;
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interrupts = <20 4>;
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atmel,adc-channel-base = <0x30>;
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atmel,adc-channels-used = <0xff>;
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atmel,adc-drdy-mask = <0x10000>;
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atmel,adc-num-channels = <8>;
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atmel,adc-startup-time = <40>;
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atmel,adc-status-register = <0x1c>;
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atmel,adc-trigger-register = <0x08>;
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atmel,adc-use-external;
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atmel,adc-vref = <3300>;
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trigger@0 {
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trigger-name = "external-rising";
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trigger-value = <0x1>;
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trigger-external;
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};
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trigger@1 {
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trigger-name = "external-falling";
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trigger-value = <0x2>;
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trigger-external;
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};
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trigger@2 {
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trigger-name = "external-any";
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trigger-value = <0x3>;
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trigger-external;
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};
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trigger@3 {
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trigger-name = "continuous";
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trigger-value = <0x6>;
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};
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};
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@ -15,6 +15,8 @@
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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@ -415,6 +417,123 @@ static int at91_adc_read_raw(struct iio_dev *idev,
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return -EINVAL;
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}
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static int at91_adc_probe_dt(struct at91_adc_state *st,
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struct platform_device *pdev)
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{
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struct iio_dev *idev = iio_priv_to_dev(st);
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struct device_node *node = pdev->dev.of_node;
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struct device_node *trig_node;
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int i = 0, ret;
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u32 prop;
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if (!node)
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return -EINVAL;
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st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
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if (of_property_read_u32(node, "atmel,adc-channels-used", &prop)) {
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dev_err(&idev->dev, "Missing adc-channels-used property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->channels_mask = prop;
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if (of_property_read_u32(node, "atmel,adc-num-channels", &prop)) {
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dev_err(&idev->dev, "Missing adc-num-channels property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->num_channels = prop;
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if (of_property_read_u32(node, "atmel,adc-startup-time", &prop)) {
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dev_err(&idev->dev, "Missing adc-startup-time property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->startup_time = prop;
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if (of_property_read_u32(node, "atmel,adc-vref", &prop)) {
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dev_err(&idev->dev, "Missing adc-vref property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->vref_mv = prop;
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st->registers = devm_kzalloc(&idev->dev,
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sizeof(struct at91_adc_reg_desc),
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GFP_KERNEL);
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if (!st->registers) {
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dev_err(&idev->dev, "Could not allocate register memory.\n");
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ret = -ENOMEM;
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goto error_ret;
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}
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if (of_property_read_u32(node, "atmel,adc-channel-base", &prop)) {
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dev_err(&idev->dev, "Missing adc-channel-base property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->registers->channel_base = prop;
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if (of_property_read_u32(node, "atmel,adc-drdy-mask", &prop)) {
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dev_err(&idev->dev, "Missing adc-drdy-mask property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->registers->drdy_mask = prop;
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if (of_property_read_u32(node, "atmel,adc-status-register", &prop)) {
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dev_err(&idev->dev, "Missing adc-status-register property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->registers->status_register = prop;
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if (of_property_read_u32(node, "atmel,adc-trigger-register", &prop)) {
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dev_err(&idev->dev, "Missing adc-trigger-register property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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st->registers->trigger_register = prop;
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st->trigger_number = of_get_child_count(node);
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st->trigger_list = devm_kzalloc(&idev->dev, st->trigger_number *
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sizeof(struct at91_adc_trigger),
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GFP_KERNEL);
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if (!st->trigger_list) {
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dev_err(&idev->dev, "Could not allocate trigger list memory.\n");
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ret = -ENOMEM;
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goto error_ret;
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}
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for_each_child_of_node(node, trig_node) {
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struct at91_adc_trigger *trig = st->trigger_list + i;
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const char *name;
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if (of_property_read_string(trig_node, "trigger-name", &name)) {
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dev_err(&idev->dev, "Missing trigger-name property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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trig->name = name;
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if (of_property_read_u32(trig_node, "trigger-value", &prop)) {
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dev_err(&idev->dev, "Missing trigger-value property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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trig->value = prop;
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trig->is_external = of_property_read_bool(trig_node, "trigger-external");
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i++;
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}
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return 0;
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error_ret:
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return ret;
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}
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static int at91_adc_probe_pdata(struct at91_adc_state *st,
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struct platform_device *pdev)
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{
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@ -456,7 +575,11 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
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st = iio_priv(idev);
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ret = at91_adc_probe_pdata(st, pdev);
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if (pdev->dev.of_node)
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ret = at91_adc_probe_dt(st, pdev);
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else
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ret = at91_adc_probe_pdata(st, pdev);
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if (ret) {
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dev_err(&pdev->dev, "No platform data available.\n");
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ret = -EINVAL;
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@ -657,11 +780,18 @@ static int __devexit at91_adc_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct of_device_id at91_adc_dt_ids[] = {
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{ .compatible = "atmel,at91sam9260-adc" },
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{},
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};
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MODULE_DEVICE_TABLE(of, at91_adc_dt_ids);
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static struct platform_driver at91_adc_driver = {
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.probe = at91_adc_probe,
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.remove = __devexit_p(at91_adc_remove),
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.driver = {
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.name = "at91_adc",
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.of_match_table = of_match_ptr(at91_adc_dt_ids),
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},
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};
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