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Date: Mon, 1 Nov 2021 07:53:52 -0500
From: Rob Herring <robh+dt@...nel.org>
To: Dominique Martinet <dominique.martinet@...ark-techno.com>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
Alessandro Zummo <a.zummo@...ertech.it>,
"open list:REAL TIME CLOCK (RTC) SUBSYSTEM"
<linux-rtc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Marek Vasut <marex@...x.de>
Subject: Re: [PATCH 2/2] rv8803: add irq-gpio optional dts attribute
On Sun, Oct 31, 2021 at 8:40 PM Dominique Martinet
<dominique.martinet@...ark-techno.com> wrote:
>
> Some device cannot be woken up from i2c signal.
> Add a new irq-gpio attribute for devices which have a gpio connected to
> the rv8803 INT line so the rtc can be used for suspend to mem
Please send DT patches to the DT list.
Binding changes should be a separate patch.
>
> Signed-off-by: Dominique Martinet <dominique.martinet@...ark-techno.com>
> ---
>
> Our board does not have an upstream dts so I cannot provide a real
> example for it, but I've tested this on something close to the
> imx8mp-evk.
>
> It should not break anything for people having no alarm at all or using
> the i2c irq.
>
> .../devicetree/bindings/rtc/epson,rx8900.yaml | 5 ++
> drivers/rtc/rtc-rv8803.c | 73 +++++++++++++++++--
> 2 files changed, 73 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml b/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml
> index 29fe39bb08ad..0d7912b984c7 100644
> --- a/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml
> +++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.yaml
> @@ -28,6 +28,10 @@ properties:
>
> trickle-diode-disable: true
>
> + irq-gpio:
> + description: |
> + gpio for INT signal. Set up gpio for irq and device wakeup.
No, use 'interrupts' as interrupt capable GPIO controllers are also an
interrupt provider.
> +
> required:
> - compatible
> - reg
> @@ -45,5 +49,6 @@ examples:
> reg = <0x32>;
> epson,vdet-disable;
> trickle-diode-disable;
> + irq-gpio = <&gpio1 11 GPIO_ACTIVE_LOW>;
> };
> };
> diff --git a/drivers/rtc/rtc-rv8803.c b/drivers/rtc/rtc-rv8803.c
> index 0d5ed38bf60c..1c4b96bc110e 100644
> --- a/drivers/rtc/rtc-rv8803.c
> +++ b/drivers/rtc/rtc-rv8803.c
> @@ -16,6 +16,7 @@
> #include <linux/module.h>
> #include <linux/of_device.h>
> #include <linux/rtc.h>
> +#include <linux/pm_wakeirq.h>
>
> #define RV8803_I2C_TRY_COUNT 4
>
> @@ -509,6 +510,61 @@ static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
> flags);
> }
>
> +static int rv8803_setup_gpio_irq(struct i2c_client *client)
> +{
> + struct device *dev = &client->dev;
> + int err;
> + int irq;
> + unsigned long irqflags;
> + struct gpio_desc *gpiod;
> +
> +
> + gpiod = devm_gpiod_get_from_of_node(dev, dev->of_node, "irq-gpio",
> + 0, GPIOD_IN, "RTC irq pin");
> + if (!gpiod || IS_ERR(gpiod)) {
> + dev_dbg(dev, "no gpio for rtc: skipping\n");
> + return -ENOENT;
> + }
> +
> + irq = gpiod_to_irq(gpiod);
> + if (irq < 0) {
> + dev_err(dev, "gpio found but no irq\n");
> + err = irq;
> + goto error_gpio;
> + }
> +
> + irqflags = IRQF_ONESHOT;
> + irqflags |= gpiod_is_active_low(gpiod) ?
> + IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
> +
> + err = devm_request_threaded_irq(dev, irq, NULL, rv8803_handle_irq,
> + irqflags, "rtc-rv8803-gpio", client);
> + if (err) {
> + dev_warn(dev, "unable to request IRQ\n");
> + goto error_gpio;
> + }
> +
> + err = device_init_wakeup(dev, true);
> + if (err) {
> + dev_warn(dev, "unable to set as wakeup source\n");
> + goto error_irq;
> + }
> +
> + err = dev_pm_set_wake_irq(dev, irq);
> + if (err) {
> + dev_warn(dev, "unable to set wake irq\n");
> + goto error_irq;
> + }
> +
> + return 0;
> +
> +error_irq:
> + devm_free_irq(dev, irq, client);
> +error_gpio:
> + devm_gpiod_put(dev, gpiod);
> + return err;
> +}
> +
> static int rv8803_probe(struct i2c_client *client,
> const struct i2c_device_id *id)
> {
> @@ -524,6 +580,7 @@ static int rv8803_probe(struct i2c_client *client,
> .reg_write = rv8803_nvram_write,
> .priv = client,
> };
> + bool irq_setup = false;
>
> if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
> I2C_FUNC_SMBUS_I2C_BLOCK)) {
> @@ -562,17 +619,23 @@ static int rv8803_probe(struct i2c_client *client,
> if (IS_ERR(rv8803->rtc))
> return PTR_ERR(rv8803->rtc);
>
> - if (client->irq > 0) {
> + if (client->dev.of_node) {
> + err = rv8803_setup_gpio_irq(client);
> + if (!err)
> + irq_setup = true;
> + }
> +
> + if (!irq_setup && client->irq > 0) {
> err = devm_request_threaded_irq(&client->dev, client->irq,
> NULL, rv8803_handle_irq,
> IRQF_TRIGGER_LOW | IRQF_ONESHOT,
> "rv8803", client);
> - if (err) {
> + if (err)
> dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
> - client->irq = 0;
> - }
> + else
> + irq_setup = true;
> }
> - if (!client->irq)
> + if (!irq_setup)
> clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features);
>
> err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
> --
> 2.30.2
>
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