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Date: Thu, 25 Jun 2015 10:58:21 +0000
From: "Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
Support Opensource <Support.Opensource@...semi.com>,
Liam Girdwood <lgirdwood@...il.com>,
"Mark Brown" <broonie@...nel.org>,
"Opensource [Steve Twiss]" <stwiss.opensource@...semi.com>
CC: "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH] regulator: da9210: Add optional interrupt support
On 24 June 2015 13:14, Geert Uytterhoeven wrote:
> To: Support Opensource; Liam Girdwood; Mark Brown; Opensource [Steve Twiss]
> Subject: [PATCH] regulator: da9210: Add optional interrupt support
>
> Add optional interrupt support to the da9210 regulator driver, to handle
> over-current, under- and over-voltage, and over-temperature events.
>
> Only the interrupt sources for which we handle events are unmasked, to
> avoid interrupts we cannot handle.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Cc: devicetree@...r.kernel.org
> ---
> I do not have access to the da9210 datasheet, but looked at the da9211 driver.
>
> v2:
> - Only acknowledge unmasked sources,
> - Handle DA9210_E_VMAX using REGULATOR_EVENT_REGULATION_OUT.
> ---
Hi Geert,
https://lkml.org/lkml/2015/2/17/358
I got side-tracked with other things and this one got forgotten ...
I'll take another look at this. A cursory glance from me -- it seems fair and
consistent with the DA9210 data sheet. I'll check with the engineers here.
Regards,
Steve
> .../devicetree/bindings/regulator/da9210.txt | 4 ++
> drivers/regulator/da9210-regulator.c | 75
> ++++++++++++++++++++++
> 2 files changed, 79 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/regulator/da9210.txt
> b/Documentation/devicetree/bindings/regulator/da9210.txt
> index 3297c53cb9152395..7aa9b1fa6b21ca18 100644
> --- a/Documentation/devicetree/bindings/regulator/da9210.txt
> +++ b/Documentation/devicetree/bindings/regulator/da9210.txt
> @@ -5,6 +5,10 @@ Required properties:
> - compatible: must be "dlg,da9210"
> - reg: the i2c slave address of the regulator. It should be 0x68.
>
> +Optional properties:
> +
> +- interrupts: a reference to the DA9210 interrupt, if available.
> +
> Any standard regulator properties can be used to configure the single
> da9210
> DCDC.
>
> diff --git a/drivers/regulator/da9210-regulator.c b/drivers/regulator/da9210-
> regulator.c
> index f0489cb9018b4e78..8e39f7457bc36a07 100644
> --- a/drivers/regulator/da9210-regulator.c
> +++ b/drivers/regulator/da9210-regulator.c
> @@ -22,6 +22,8 @@
> #include <linux/i2c.h>
> #include <linux/module.h>
> #include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> #include <linux/slab.h>
> #include <linux/regulator/driver.h>
> #include <linux/regulator/machine.h>
> @@ -120,6 +122,55 @@ static int da9210_get_current_limit(struct
> regulator_dev *rdev)
> return da9210_buck_limits[sel];
> }
>
> +static irqreturn_t da9210_irq_handler(int irq, void *data)
> +{
> + struct da9210 *chip = data;
> + unsigned int val, handled = 0;
> + int error, ret = IRQ_NONE;
> +
> + error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
> + if (error < 0)
> + goto error_i2c;
> +
> + if (val & DA9210_E_OVCURR) {
> + regulator_notifier_call_chain(chip->rdev,
> +
> REGULATOR_EVENT_OVER_CURRENT,
> + NULL);
> + handled |= DA9210_E_OVCURR;
> + }
> + if (val & DA9210_E_NPWRGOOD) {
> + regulator_notifier_call_chain(chip->rdev,
> +
> REGULATOR_EVENT_UNDER_VOLTAGE,
> + NULL);
> + handled |= DA9210_E_NPWRGOOD;
> + }
> + if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
> + regulator_notifier_call_chain(chip->rdev,
> + REGULATOR_EVENT_OVER_TEMP,
> NULL);
> + handled |= val & (DA9210_E_TEMP_WARN |
> DA9210_E_TEMP_CRIT);
> + }
> + if (val & DA9210_E_VMAX) {
> + regulator_notifier_call_chain(chip->rdev,
> +
> REGULATOR_EVENT_REGULATION_OUT,
> + NULL);
> + handled |= DA9210_E_VMAX;
> + }
> + if (handled) {
> + /* Clear handled events */
> + error = regmap_write(chip->regmap,
> DA9210_REG_EVENT_B, handled);
> + if (error < 0)
> + goto error_i2c;
> +
> + ret = IRQ_HANDLED;
> + }
> +
> + return ret;
> +
> +error_i2c:
> + dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n",
> error);
> + return ret;
> +}
> +
> /*
> * I2C driver interface functions
> */
> @@ -168,6 +219,30 @@ static int da9210_i2c_probe(struct i2c_client *i2c,
> }
>
> chip->rdev = rdev;
> + if (i2c->irq) {
> + error = devm_request_threaded_irq(&i2c->dev, i2c->irq,
> NULL,
> + da9210_irq_handler,
> + IRQF_TRIGGER_LOW |
> + IRQF_ONESHOT |
> IRQF_SHARED,
> + "da9210", chip);
> + if (error) {
> + dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
> + i2c->irq, error);
> + return error;
> + }
> +
> + error = regmap_update_bits(chip->regmap,
> DA9210_REG_MASK_B,
> + DA9210_M_OVCURR |
> DA9210_M_NPWRGOOD |
> + DA9210_M_TEMP_WARN |
> + DA9210_M_TEMP_CRIT |
> DA9210_M_VMAX, 0);
> + if (error < 0) {
> + dev_err(&i2c->dev, "Failed to update mask reg:
> %d\n",
> + error);
> + return error;
> + }
> + } else {
> + dev_warn(&i2c->dev, "No IRQ configured\n");
> + }
>
> i2c_set_clientdata(i2c, chip);
>
> --
> 1.9.1
--
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