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Date: Fri, 29 Aug 2014 11:56:19 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Nishanth Menon <nm@...com>
Cc: Samuel Ortiz <sameo@...ux.intel.com>,
Mark Brown <broonie@...aro.org>,
Tony Lindgren <tony@...mide.com>, Keerthy <j-keerthy@...com>,
devicetree@...r.kernel.org, linux-omap@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: palmas: Add support for optional wakeup
On Tue, 19 Aug 2014, Nishanth Menon wrote:
> With the recent pinctrl-single changes, omaps can treat wake-up events
> from deeper idle states as interrupts.
>
> Let's add support for the optional second interrupt for wake-up
> events. And then SoC can wakeup and handle the event using it's
> regular handler.
>
> Finally, to pass the wake-up interrupt in the dts file,
> interrupts-extended property needs to be passed.
>
> This is similar in approach to commit 2a0b965cfb6e ("serial: omap: Add
> support for optional wake-up")
>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
> Documentation/devicetree/bindings/mfd/palmas.txt | 20 ++++++++
DT Ack please.
> drivers/mfd/palmas.c | 59 ++++++++++++++++++++++
> include/linux/mfd/palmas.h | 2 +
> 3 files changed, 81 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mfd/palmas.txt b/Documentation/devicetree/bindings/mfd/palmas.txt
> index eda8989..2627842 100644
> --- a/Documentation/devicetree/bindings/mfd/palmas.txt
> +++ b/Documentation/devicetree/bindings/mfd/palmas.txt
> @@ -51,3 +51,23 @@ palmas {
> ....
> };
> }
> +
> +Example: with interrupts extended
> + See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
> + Use pinmux 0x418 as wakeup interrupt and gpio1_0 as interrupt source
> +
> +palmas {
Should this be 'palmas@40 {'?
> + compatible = "ti,twl6035", "ti,palmas";
> + reg = <0x48>
> + interrupt-parent = <&intc>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> + interrupts-extended = <&gpio1 0 IRQ_TYPE_LEVEL_HIGH
> + &pinmux 0x418>;
Can I get a DT Ack, that this is being used correctly? It doesn't
match the syntax given in:
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
> + pmic {
> + compatible = "ti,twl6035-pmic", "ti,palmas-pmic";
> + ....
> + };
> +}
> diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
> index 28cb048..11186ab 100644
> --- a/drivers/mfd/palmas.c
> +++ b/drivers/mfd/palmas.c
> @@ -24,6 +24,7 @@
> #include <linux/mfd/core.h>
> #include <linux/mfd/palmas.h>
> #include <linux/of_device.h>
> +#include <linux/of_irq.h>
>
> static const struct regmap_config palmas_regmap_config[PALMAS_NUM_CLIENTS] = {
> {
> @@ -326,6 +327,16 @@ static struct regmap_irq_chip tps65917_irq_chip = {
> PALMAS_INT1_MASK),
> };
>
> +static irqreturn_t palmas_wake_irq(int irq, void *_palmas)
> +{
> + /*
> + * Return Not handled so that interrupt is disabled.
> + * Level event ensures that the event is eventually handled
> + * by the appropriate chip handler already registered
> + */
This looks okay to me, but could do with a second opinion from someone
who is a little more familier with this kind of h/w.
How does this differ from threading IRQs?
> + return IRQ_NONE;
> +}
> +
> int palmas_ext_control_req_config(struct palmas *palmas,
> enum palmas_external_requestor_id id, int ext_ctrl, bool enable)
> {
> @@ -409,6 +420,7 @@ static void palmas_dt_to_pdata(struct i2c_client *i2c,
> pdata->mux_from_pdata = 1;
> pdata->pad2 = prop;
> }
> + pdata->wakeirq = irq_of_parse_and_map(node, 1);
>
> /* The default for this register is all masked */
> ret = of_property_read_u32(node, "ti,power-ctrl", &prop);
> @@ -521,6 +533,7 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
> i2c_set_clientdata(i2c, palmas);
> palmas->dev = &i2c->dev;
> palmas->irq = i2c->irq;
> + palmas->wakeirq = pdata->wakeirq;
>
> match = of_match_device(of_palmas_match_tbl, &i2c->dev);
>
> @@ -587,6 +600,22 @@ static int palmas_i2c_probe(struct i2c_client *i2c,
> if (ret < 0)
> goto err_i2c;
>
> + if (!palmas->wakeirq)
> + goto no_wake_irq;
> +
> + ret = devm_request_irq(palmas->dev, palmas->wakeirq,
> + palmas_wake_irq,
> + IRQF_ONESHOT | pdata->irq_flags,
> + dev_name(palmas->dev),
> + &palmas);
> + if (ret < 0)
> + goto err_i2c;
> +
> + /* We use wakeirq only during suspend-resume path */
> + device_set_wakeup_capable(palmas->dev, true);
> + disable_irq_nosync(palmas->wakeirq);
> +
> +no_wake_irq:
> no_irq:
> slave = PALMAS_BASE_TO_SLAVE(PALMAS_PU_PD_OD_BASE);
> addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
> @@ -706,6 +735,34 @@ static int palmas_i2c_remove(struct i2c_client *i2c)
> return 0;
> }
>
> +static int palmas_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg)
> +{
> + struct palmas *palmas = i2c_get_clientdata(i2c);
> + struct device *dev = &i2c->dev;
> +
> + if (!palmas->wakeirq)
> + return 0;
> +
> + if (device_may_wakeup(dev))
> + enable_irq(palmas->wakeirq);
> +
> + return 0;
> +}
> +
> +static int palmas_i2c_resume(struct i2c_client *i2c)
> +{
> + struct palmas *palmas = i2c_get_clientdata(i2c);
> + struct device *dev = &i2c->dev;
> +
> + if (!palmas->wakeirq)
> + return 0;
> +
> + if (device_may_wakeup(dev))
> + disable_irq_nosync(palmas->wakeirq);
> +
> + return 0;
> +}
> +
> static const struct i2c_device_id palmas_i2c_id[] = {
> { "palmas", },
> { "twl6035", },
> @@ -721,6 +778,8 @@ static struct i2c_driver palmas_i2c_driver = {
> .of_match_table = of_palmas_match_tbl,
> .owner = THIS_MODULE,
> },
> + .suspend = palmas_i2c_suspend,
> + .resume = palmas_i2c_resume,
> .probe = palmas_i2c_probe,
> .remove = palmas_i2c_remove,
> .id_table = palmas_i2c_id,
> diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
> index fb0390a..e8cf4c2 100644
> --- a/include/linux/mfd/palmas.h
> +++ b/include/linux/mfd/palmas.h
> @@ -75,6 +75,7 @@ struct palmas {
> /* IRQ Data */
> int irq;
> u32 irq_mask;
> + int wakeirq;
> struct mutex irq_lock;
> struct regmap_irq_chip_data *irq_data;
>
> @@ -377,6 +378,7 @@ struct palmas_clk_platform_data {
>
> struct palmas_platform_data {
> int irq_flags;
> + int wakeirq;
> int gpio_base;
>
> /* bit value to be loaded to the POWER_CTRL register */
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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