linux-kernel - [PATCH v2] pinctrl: qcom: spmi-gpio: Make IRQCHIP immutable

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Message-Id: <20220830081212.164709-1-manivannan.sadhasivam@linaro.org>
Date:   Tue, 30 Aug 2022 13:42:12 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     linus.walleij@...aro.org, bjorn.andersson@...aro.org
Cc:     robimarko@...il.com, linux-arm-msm@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        maz@...nel.org, johan+linaro@...nel.org, steev@...i.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2] pinctrl: qcom: spmi-gpio: Make IRQCHIP immutable

The IRQCHIP implementation used inside the gpiochips are not supposed to
be changed during runtime. So let's make the one inside the spmi-gpio
gpiochip immutable.

This fixes the below warning during boot:
gpio gpiochip0: (c440000.spmi:pmic@0:gpio@...0): not an immutable chip, please consider fixing it!

Separate callbacks need to be provided for irq_{mask/unmask} pointers since
the callbacks are supposed to mask/unmask the corresponding parent IRQ in
addition to changing the gpio_desc flags.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---

Changes in v2:

* Added new callbacks for irq_{mask/unmask} for masking/unmasking the parent
  IRQ that was missing in v1. (Thanks to Marc)
* Modified the commit message accordingly.

 drivers/pinctrl/qcom/pinctrl-spmi-gpio.c | 38 +++++++++++++++++-------
 1 file changed, 28 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
index ccaf40a9c0e6..d40e3b2d38cc 100644
--- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
@@ -171,7 +171,6 @@ struct pmic_gpio_state {
 	struct regmap	*map;
 	struct pinctrl_dev *ctrl;
 	struct gpio_chip chip;
-	struct irq_chip irq;
 	u8 usid;
 	u8 pid_base;
 };
@@ -985,6 +984,33 @@ static int pmic_gpio_populate_parent_fwspec(struct gpio_chip *chip,
 	return 0;
 }
 
+static void pmic_gpio_irq_mask(struct irq_data *data)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+
+	irq_chip_mask_parent(data);
+	gpiochip_disable_irq(gc, data->hwirq);
+}
+
+static void pmic_gpio_irq_unmask(struct irq_data *data)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
+
+	irq_chip_unmask_parent(data);
+	gpiochip_enable_irq(gc, data->hwirq);
+}
+
+static const struct irq_chip spmi_gpio_irq_chip = {
+	.name		= "spmi-gpio",
+	.irq_ack	= irq_chip_ack_parent,
+	.irq_mask	= pmic_gpio_irq_mask,
+	.irq_unmask	= pmic_gpio_irq_unmask,
+	.irq_set_type	= irq_chip_set_type_parent,
+	.irq_set_wake	= irq_chip_set_wake_parent,
+	.flags		= IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int pmic_gpio_probe(struct platform_device *pdev)
 {
 	struct irq_domain *parent_domain;
@@ -1078,16 +1104,8 @@ static int pmic_gpio_probe(struct platform_device *pdev)
 	if (!parent_domain)
 		return -ENXIO;
 
-	state->irq.name = "spmi-gpio",
-	state->irq.irq_ack = irq_chip_ack_parent,
-	state->irq.irq_mask = irq_chip_mask_parent,
-	state->irq.irq_unmask = irq_chip_unmask_parent,
-	state->irq.irq_set_type = irq_chip_set_type_parent,
-	state->irq.irq_set_wake = irq_chip_set_wake_parent,
-	state->irq.flags = IRQCHIP_MASK_ON_SUSPEND,
-
 	girq = &state->chip.irq;
-	girq->chip = &state->irq;
+	gpio_irq_chip_set_chip(girq, &spmi_gpio_irq_chip);
 	girq->default_type = IRQ_TYPE_NONE;
 	girq->handler = handle_level_irq;
 	girq->fwnode = of_node_to_fwnode(state->dev->of_node);
-- 
2.25.1