Add support for AD8460 #2458

MarielTinaco · 2024-03-15T10:19:54Z

This adds device tree bindings compatible strings, driver support and ZedBoard device trees for AD8460 High Voltage, High Current Arbitrary Waveform Generator DAC.

For more information:
Arbitrary Waveform Generator with Integrated 14-Bit High Speed DAC

This has been tested on the ZedBoard which controls the EVAL-AD8460SDZ evaluation board

nunojsa

Some initial feedback... Also make sure to fix compilation for arm64

Documentation/devicetree/bindings/iio/dac/adi,ad8460.yaml

drivers/iio/dac/ad8460.c

MarielTinaco · 2024-04-04T02:18:55Z

v2

Moved some attributes to debugfs
Applied cleanup magic
Provided missing includes

nunojsa · 2024-04-08T11:24:23Z

@MarielTinaco, sorry for the delay. I did replied to some your questions... Make sure to fix the build errors CI is reporting and push another version of the PULL.

Hint for the future:
If you push directly to ADI git tree and name your branch as staging/..., basic CI will run on your dev branch so you can catch build errors like this before opening (or force push) the PULL . If you do not have access to push into ADI tree, we can have a look.

MarielTinaco · 2024-04-09T01:06:49Z

Hi @nunojsa unfortunately I do not have access to push into the ADI tree. But it will surely come in handy in the future. Thanks!

MarielTinaco · 2024-04-09T01:39:38Z

V3

Fixed CI build errors

MarielTinaco · 2024-04-12T04:55:37Z

V4

Added buffer capability

nunojsa

Main thing we should see now is that limits stuff. I'm not sure but maybe somehow using the hwmon subsystem would make sense. Like that we could actually control those limits over userspace. But for that, I think we would need to be capable to also read the "thing" we're putting limits on...

nunojsa · 2024-04-12T06:53:51Z

Documentation/devicetree/bindings/iio/dac/adi,ad8460.yaml

+
+  clock-names:
+    items:
+      - const: sync_clk


if we just have one clk, we don't really need clock-names...

if I remove the usage of clock-names? how does this affect the way I call sync_clk from the driver?

in the driver code, this is the current implementation

sync_clk = devm_clk_get_enabled(&spi->dev, "sync_clk"); if (IS_ERR(sync_clk)) return dev_err_probe(&spi->dev, PTR_ERR(sync_clk), "Failed to get sync clk\n");

drivers/iio/dac/ad8460.c

nunojsa · 2024-04-12T08:07:21Z

drivers/iio/dac/ad8460.c

+	if (ret)
+		return ret;
+
+	ret = regmap_read(state->regmap, AD8460_CTRL_REG(0x02), &mode);


again... is a read() that bad?

right, I don't think this should interfere with the buffer capture. I should just remove the device claim/release, is that right?

struct iio_dev *indio_dev = arg; struct ad8460_state *state = iio_priv(indio_dev); u32 reg; int ret; ret = regmap_read(state->regmap, AD8460_CTRL_REG(0x02), &reg); if (ret) return ret; *val = FIELD_GET(AD8460_PATTERN_DEPTH_MSK, reg); return 0;

right, I don't think this should interfere with the buffer capture.

With the above in mind, I think so, yes...

drivers/iio/dac/ad8460.c

nunojsa · 2024-04-12T08:12:41Z

drivers/iio/dac/ad8460.c

+			   int *val,
+			   int *val2,
+			   long mask)
+{


can we only get samples while buffering? Or can we just read a single sample (using IIO_CHAN_INFO_RAW)?

Ups, forget this. This is a DAC... And from a quick look on DS, it looks like we don't have any register to control the word to send out (just using that pattern memory stuff)

Pattern depth and pattern memory are configurable settings for the Arbitrary Pattern Generator (APG) mode. Pattern memory is an array like property that is found on the SPI registers.

But taking your words, I'm now thinking if it would make sense to support IIO_CHAN_INFO_RAW where pattern depth is pretty much 1 and we just output a DC voltage. Would that work or does it make sense to you?

Yes, it does make sense to support IIO_CHAN_INFO_RAW this way.

I'll include this in the next revision

yeah, this device has some funny stuff :)

commodo · 2024-04-17T06:36:13Z

drivers/iio/dac/ad8460.c

+	if (ret)
+		return ret;
+
+	ret = ad8460_enable_apg_mode(state, val);


iio_device_release_direct_mode(indio_dev) here?
otherwise we leave it claimed on error;

i take it that I should bump the iio_device_release_direct_mode(indio_dev) up before return like here?

ret = ad8460_enable_apg_mode(state, val); iio_device_release_direct_mode(indio_dev); return ret;

Well, when upstreaming use the new iio_device_claim_direct_scoped(). Then, no need to care about releasing it :)

drivers/iio/dac/ad8460.c

commodo · 2024-04-17T06:38:05Z

drivers/iio/dac/ad8460.c

+static struct iio_chan_spec_ext_info ad8460_ext_info[] = {
+	AD8460_CHAN_EXT_INFO("powerdown", 0, IIO_SEPARATE,
+			     ad8460_read_powerdown, ad8460_write_powerdown),
+	{},


general nitpick (upstream will say): null terminators, don't need a trailing comma

commodo · 2024-04-17T06:40:54Z

drivers/iio/dac/ad8460.c

+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 80 * (2000 / state->rset_ohms) * (state->vref_mv / 1000);


i wonder if it's better to rewrite this formula to prefer multiplications first and divisions later;
integer division tends to lose some precision;
then there can be a comment about the original formula, or reference it to the datasheet

I refactored it this way

case IIO_CHAN_INFO_SCALE: /* vCONVENTIONAL = 80V * (DAC_CODE / 2**14) - 40V * vMAX = 80V * (2**14 / 2**14) - 40V * vMIN = 80V * (0 / 2**14) - 40V * vADJ = vCONVENTIONAL * (2000 / rSET) * (vREF / 1.2) * vSPAN = vADJ_MAX - vADJ_MIN * See datasheet page 49, section FULL-SCALE REDUCTION */ num = 80 * 2000 * state->vref_mv; denom = state->rset_ohms * 1200; *val = DIV_ROUND_CLOSEST_ULL(num, denom); return IIO_VAL_INT;

MarielTinaco · 2024-04-22T09:22:59Z

V5
- remove clock-names
- refactor debugfs init
- handling of GPIO soft reset
- add raw value as channel attribute
- refactor scale calculation

- held off pm_runtime functions due to boot errors
- retained setting of alarm limits and arming device

nunojsa · 2024-04-23T08:53:21Z

Documentation/devicetree/bindings/iio/dac/adi,ad8460.yaml

+  adi,temp-lim-millicelsius:
+    description: Specify the overtemperature limits
+    minimum: 20000
+    maximum: 150000


it seems to me that the above properties will likely not be needed. But if you stick with them, you should set a default: value for them

Removed this attribute

nunojsa · 2024-04-23T08:54:30Z

drivers/iio/dac/ad8460.c

+	if (ret)
+		return ret;
+
+	usleep_range(10, 50);


drivers/iio/dac/ad8460.c

nunojsa · 2024-04-23T08:57:34Z

drivers/iio/dac/ad8460.c

+
+		reg = FIELD_PREP(AD8460_PATTERN_DEPTH_MSK, 0);
+		return regmap_update_bits(state->regmap, AD8460_CTRL_REG(0x02),
+					  AD8460_PATTERN_DEPTH_MSK, reg);


You need to review your locking... You're protecting ad8460_enable_apg_mode() internally and then ad8460_set_hvdac_byte() while the following regmap_update_bits() has no protection (apart from internal regmap lock that won't matter in this case). It seems to me that the complete sequence should be protected.

I see, it seems like a should put locking on the higher level functions or those functions that wrap the other function calls and remove it from the lower level functions

nunojsa · 2024-04-23T08:59:33Z

drivers/iio/dac/ad8460.c

+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:


Also seems to me this should be protected with iio_device_claim_direct_scoped(). If you're buffering, you should not be able to do a write_raw(). Otherwise, buffering will break

Will I be able to use iio_device_claim_direct_scoped() right now? is it supported in this repo yet? Or did you mean that I must have it during upstream and use iio_device_claim_direct_mode/iio_device_release_direct_mode for now?

For now, this is what write raw looks like using the IIO device claim/release

struct ad8460_state *state = iio_priv(indio_dev); unsigned int reg; int ret; switch (mask) { case IIO_CHAN_INFO_RAW: ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; guard(mutex)(&state->lock); ret = ad8460_enable_apg_mode(state, 1); if (ret) return ret; ret = ad8460_set_hvdac_byte(state, 0, val); if (ret) return ret; reg = FIELD_PREP(AD8460_PATTERN_DEPTH_MSK, 0); ret = regmap_update_bits(state->regmap, AD8460_CTRL_REG(0x02), AD8460_PATTERN_DEPTH_MSK, reg); iio_device_release_direct_mode(indio_dev); return ret; default: return -EINVAL; }

Will I be able to use iio_device_claim_direct_scoped() right now? is it supported in this repo yet? Or did you mean that I must have it during upstream and use iio_device_claim_direct_mode/iio_device_release_direct_mode for now?

I think it's only upstream for now...

drivers/iio/dac/ad8460.c

nunojsa · 2024-04-23T09:01:13Z

drivers/iio/dac/ad8460.c

+}
+DEFINE_DEBUGFS_ATTRIBUTE(ad8460_apg_pattern_depth_fops,
+			 ad8460_show_apg_pattern_depth,
+			 ad8460_set_apg_pattern_depth, "%llu\n");


Do we still want the debugfs interface now we have it in write raw? The only justification I see would be to have more words.

I think the pattern_depth can remain on debugfs interface. If setting two integer values at a time, (pattern index and word) is available in write raw, I think pattern_memory can also be removed from debugfs. Maybe the two values of write_raw (val and val2) can be used for this? I'll remove the apg_mode_enable from debugfs now, since it is handled on write raw and pre-enable of buffer.

another option is to be able selection of test patterns instead such as square, ramp, default etc. this can cover both pattern_depth and pattern_memory setting. what do you think?

Hmm not sure what you mean about the last question? Could you clarify it a bit?

drivers/iio/dac/ad8460.c

MarielTinaco · 2024-04-25T12:45:01Z

V6

Fixed guard locking
Used fsleep() for delays
Remove apg_mode_enable from debugfs
Removed Fault protection in default

nunojsa

This already looks good enough to send a first version upstream. So you can take my last review and send it out :). Couple of things to note:

You need to improve your commit message on the patch adding support for the driver. Don't mention via axi. You need a small description of the device (like you have in the bindings patch);
Don't forget to mention the hwmon capabilities and how can we better support them (if still have the intuit of adding them)
And be prepared for some (maybe lots) changes to be asked. This is a very funny part so I expect the upstream review to be equally "funny" :)

drivers/iio/dac/ad8460.c

nunojsa · 2024-04-29T08:21:45Z

drivers/iio/dac/ad8460.c

+
+	state->sync_clk = sync_clk;
+
+	vrefio = devm_regulator_get_optional(&spi->dev, "vrefio");


Yeah, this needs to be on the bindings...

nunojsa · 2024-04-29T08:23:21Z

drivers/iio/dac/ad8460.c

+}
+DEFINE_DEBUGFS_ATTRIBUTE(ad8460_apg_pattern_depth_fops,
+			 ad8460_show_apg_pattern_depth,
+			 ad8460_set_apg_pattern_depth, "%llu\n");


Hmm not sure what you mean about the last question? Could you clarify it a bit?

nunojsa · 2024-04-29T08:26:09Z

drivers/iio/dac/ad8460.c

+static struct iio_chan_spec_ext_info ad8460_ext_info[] = {
+	AD8460_CHAN_EXT_INFO("powerdown", 0, IIO_SEPARATE,
+			     ad8460_read_powerdown, ad8460_write_powerdown),
+	{}


note you may be asked to support powerdown-mode

I see. Although, unlike other devices where the powerdown modes are explicitly stated as part of the SPI register, in this device, I don't think there is an exact equivalent, that comes close to the selections defined in the ABI for powerdown-modes.

I don't think you need to support all of them... Does the datasheet sates something about what happens when you power down. Again, no special need for this now (was just warning that you might get asked for it). You can always argue this upstream and see the reply.

Now that you mention it, it does seem to have a powerdown state when HV sleep is initiated. Device OUT is terminated to 27kohms

"27kohms_to_gnd" doesn't fall under the available selections in the ABI,

are we allowed to create our own entry?

Yes, we're allowed to update the ABI file... You can propose a new entry and support it in the drier and see how it goes :)

gotcha! But since there is only possible powerdown-mode, do I just create an empty setter/getter for it? like here

static const char * const ad8460_powerdown_modes[] = { "27kohm_to_gnd", }; static int ad8460_get_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { return 0; } static int ad8460_set_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, unsigned int type) { return 0; } static const struct iio_enum ad8460_powerdown_mode_enum = { .items = ad8460_powerdown_modes, .num_items = ARRAY_SIZE(ad8460_powerdown_modes), .get = ad8460_get_powerdown_mode, .set = ad8460_set_powerdown_mode, };

I found one such example. stm32-dac

Yeah, but I don't think you're mode is 27kohm_to_gnd. In the datasheet pic you pasted nothing states any ground connection. It says the output goes into high-z (with an impedance of around 27kohm). And that's effectively the three_state mode already supported.

Oh, I see. You're right

nunojsa · 2024-04-29T08:27:22Z

drivers/iio/dac/ad8460.c

+	unsigned int num, denom;
+	int data, ret;
+
+	guard(mutex)(&state->lock);


Why not moving this into the IIO_CHAN_INFO_RAW case?

If clean up magic is moved directly inside the "raw" case, as seen below

switch (mask) { case IIO_CHAN_INFO_RAW: guard(mutex)(&state->lock); ret = ad8460_get_hvdac_byte(state, 0, &data); if (ret) return ret; *val = data; return IIO_VAL_INT;

An error is thrown because there is no declaration before it. So what I did is placed the guard(mutex).. inside the get_hvdac_byte

Use:

scoped_guard(mutex, &state->lock) { ret = ad8460_get_hvdac_byte(state, 0, &data); if (ret) return ret; } ...

and it should work...

nunojsa · 2024-04-29T08:28:11Z

drivers/iio/dac/ad8460.c

+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:


Will I be able to use iio_device_claim_direct_scoped() right now? is it supported in this repo yet? Or did you mean that I must have it during upstream and use iio_device_claim_direct_mode/iio_device_release_direct_mode for now?

I think it's only upstream for now...

drivers/iio/dac/ad8460.c

AD8460 is a 110 V High Voltage, 1 A High Current, Arbitrary Waveform Generator with Integrated 14-Bit High Speed DAC. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

nunojsa

Small notes from me... go ahead and send it upstream (I'll also be on vacations for two weeks so no need to wait.)

nunojsa · 2024-05-06T13:00:11Z

drivers/iio/dac/ad8460.c

+	}
+	fsleep(100);
+
+	return ret;


I think ret can be used without any initialization in case gpio is used.

Refactored the reset function this way. To remove the dependency to ret

static int ad8460_reset(const struct ad8460_state *state) { struct device *dev = &state->spi->dev; struct gpio_desc *gpio; gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(gpio)) return dev_err_probe(dev, PTR_ERR(gpio), "Failed to get reset gpio"); if (gpio) { fsleep(100); gpiod_set_value_cansleep(gpio, 1); } else { return regmap_write(state->regmap, AD8460_CTRL_REG(0x03), 1); } fsleep(100); return 0; }

nunojsa · 2024-05-06T13:01:03Z

drivers/iio/dac/ad8460.c

+	if (ret)
+		return ret;
+
+	*val = (FIELD_GET(AD8460_DATA_BYTE_HIGH_MSK, high) << 8) | low;


double check it but I don't think the parenthesis...

nunojsa · 2024-05-06T13:05:00Z

drivers/iio/dac/ad8460.c

+	char data[16];
+	int ret, val;
+
+	guard(mutex)(&state->lock);


use scoped_guard() and use it in the only place needed... ad8460_set_hvdac_byte()

nunojsa · 2024-05-06T13:05:23Z

drivers/iio/dac/ad8460.c

+	int ret, val;
+	char data[16];
+
+	guard(mutex)(&state->lock);


scoped_guard()

nunojsa · 2024-05-06T13:13:44Z

drivers/iio/dac/ad8460.c

+{
+	struct ad8460_state *state = iio_priv(indio_dev);
+
+	guard(mutex)(&state->lock);


AFAICT, you don't need the mutex lock here. ad8460_enable_apg_mode() only runs against your write_raw() function and the call is protected with iio_device_claim_direct_mode() which used the same internal IIO mutex as the postdisable() and preenable() callbacks. So in this case, the internal IIO lock is fine to guarantee correctness.

nunojsa · 2024-05-06T13:15:03Z

drivers/iio/dac/ad8460.c

+
+		ret = ad8460_enable_apg_mode(state, 1);
+		if (ret)
+			return ret;


You should use the scoped version of iio_device_claim_direct_mode() when upstreaming. But note that in this code you have a deadlock as you're returning without iio_device_release_direct_mode()

I ended up with this refactor

int ret; switch (mask) { case IIO_CHAN_INFO_RAW: ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; ret = ad8460_enable_apg_mode(state, 1); iio_device_release_direct_mode(indio_dev); if (ret) return ret; scoped_guard(mutex, &state->lock) { ret = ad8460_set_hvdac_byte(state, 0, val); if (ret) return ret; reg = FIELD_PREP(AD8460_PATTERN_DEPTH_MSK, 0); ret = regmap_update_bits(state->regmap, AD8460_CTRL_REG(0x02), AD8460_PATTERN_DEPTH_MSK, reg); } return ret; default: return -EINVAL; }

nunojsa · 2024-05-06T13:15:05Z

drivers/iio/dac/ad8460.c

+
+		ret = ad8460_set_hvdac_byte(state, 0, val);
+		if (ret)
+			return ret;


The AD8460 is a 110 V High Voltage, 1 A High Current, Arbitrary Waveform Generator with Integrated 14-Bit High Speed DAC. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

Add entry for the AD8460 driver. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

Add devicetree for AD8460. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

MarielTinaco force-pushed the dev/ad8460 branch 4 times, most recently from 0c03ef0 to 5110eb7 Compare March 18, 2024 11:53

nunojsa reviewed Mar 20, 2024

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MarielTinaco force-pushed the dev/ad8460 branch from 5110eb7 to 4382c75 Compare April 4, 2024 02:16

MarielTinaco requested review from mhennerich, dbogdan, btogorean, chegbeli, buha, amiclaus, rbolboac, danmois, CiprianRegus and machschmitt as code owners April 4, 2024 02:16

MarielTinaco force-pushed the dev/ad8460 branch from 4382c75 to 1e96737 Compare April 4, 2024 03:13

MarielTinaco force-pushed the dev/ad8460 branch 2 times, most recently from dd308cf to 577e6a0 Compare April 9, 2024 01:35

MarielTinaco force-pushed the dev/ad8460 branch from 577e6a0 to 5e5cdb2 Compare April 12, 2024 04:54

nunojsa reviewed Apr 12, 2024

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commodo reviewed Apr 17, 2024

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drivers/iio/dac/ad8460.c Outdated Show resolved Hide resolved

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MarielTinaco force-pushed the dev/ad8460 branch 2 times, most recently from 878e088 to c92d51a Compare April 22, 2024 08:51

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dt-bindings: iio: dac: add ad8460

3d16c10

AD8460 is a 110 V High Voltage, 1 A High Current, Arbitrary Waveform Generator with Integrated 14-Bit High Speed DAC. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

MarielTinaco force-pushed the dev/ad8460 branch from 76d6727 to e995b43 Compare May 6, 2024 10:45

nunojsa reviewed May 6, 2024

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MarielTinaco added 3 commits May 7, 2024 19:31

iio: dac: ad8460: add support for ad8460

73c119d

The AD8460 is a 110 V High Voltage, 1 A High Current, Arbitrary Waveform Generator with Integrated 14-Bit High Speed DAC. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

iio: Kconfig.adi: imply AD8460

bc7305a

Add entry for the AD8460 driver. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

arch: arm: boot: dts: add ad8460

d67518a

Add devicetree for AD8460. Signed-off-by: Mariel Tinaco <Mariel.Tinaco@analog.com>

MarielTinaco force-pushed the dev/ad8460 branch from e995b43 to d67518a Compare May 7, 2024 11:32


		state->sync_clk = sync_clk;

		vrefio = devm_regulator_get_optional(&spi->dev, "vrefio");

Add support for AD8460 #2458

Are you sure you want to change the base?

Add support for AD8460 #2458

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nunojsa Apr 12, 2024 •

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