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Subject[PATCH 2/2] irqchip: imx-intmux: add runtime PM support
Date
Add runtime PM support for intmux interrupt controller.

Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
drivers/irqchip/irq-imx-intmux.c | 31 +++++++++++++++++++++++++------
1 file changed, 25 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-imx-intmux.c b/drivers/irqchip/irq-imx-intmux.c
index 6095f76c4f0d..a631815c7bb4 100644
--- a/drivers/irqchip/irq-imx-intmux.c
+++ b/drivers/irqchip/irq-imx-intmux.c
@@ -53,6 +53,7 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
+#include <linux/pm_runtime.h>

#define CHANIER(n) (0x10 + (0x40 * n))
#define CHANIPR(n) (0x20 + (0x40 * n))
@@ -60,6 +61,7 @@
#define CHAN_MAX_NUM 0x8

struct intmux_irqchip_data {
+ struct irq_chip chip;
int chanidx;
int irq;
struct irq_domain *domain;
@@ -123,8 +125,10 @@ static struct irq_chip imx_intmux_irq_chip = {
static int imx_intmux_irq_map(struct irq_domain *h, unsigned int irq,
irq_hw_number_t hwirq)
{
- irq_set_chip_data(irq, h->host_data);
- irq_set_chip_and_handler(irq, &imx_intmux_irq_chip, handle_level_irq);
+ struct intmux_irqchip_data *data = h->host_data;
+
+ irq_set_chip_data(irq, data);
+ irq_set_chip_and_handler(irq, &data->chip, handle_level_irq);

return 0;
}
@@ -244,6 +248,10 @@ static int imx_intmux_probe(struct platform_device *pdev)
return -ENOMEM;
}

+ pm_runtime_get_noresume(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
ret = clk_prepare_enable(data->ipg_clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret);
@@ -251,6 +259,8 @@ static int imx_intmux_probe(struct platform_device *pdev)
}

for (i = 0; i < channum; i++) {
+ data->irqchip_data[i].chip = imx_intmux_irq_chip;
+ data->irqchip_data[i].chip.parent_device = &pdev->dev;
data->irqchip_data[i].chanidx = i;

data->irqchip_data[i].irq = irq_of_parse_and_map(np, i);
@@ -279,6 +289,12 @@ static int imx_intmux_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, data);

+ /*
+ * Let pm_runtime_put() disable clock.
+ * If CONFIG_PM is not enabled, the clock will stay powered.
+ */
+ pm_runtime_put(&pdev->dev);
+
return 0;
out:
clk_disable_unprepare(data->ipg_clk);
@@ -300,7 +316,7 @@ static int imx_intmux_remove(struct platform_device *pdev)
irq_domain_remove(data->irqchip_data[i].domain);
}

- clk_disable_unprepare(data->ipg_clk);
+ pm_runtime_disable(&pdev->dev);

return 0;
}
@@ -322,7 +338,7 @@ static void imx_intmux_restore_regs(struct intmux_data *data)
writel_relaxed(data->saved_reg[i], data->regs + CHANIER(i));
}

-static int imx_intmux_suspend(struct device *dev)
+static int imx_intmux_runtime_suspend(struct device *dev)
{
struct intmux_data *data = dev_get_drvdata(dev);

@@ -332,7 +348,7 @@ static int imx_intmux_suspend(struct device *dev)
return 0;
}

-static int imx_intmux_resume(struct device *dev)
+static int imx_intmux_runtime_resume(struct device *dev)
{
struct intmux_data *data = dev_get_drvdata(dev);
int ret;
@@ -349,7 +365,10 @@ static int imx_intmux_resume(struct device *dev)
#endif

static const struct dev_pm_ops imx_intmux_pm_ops = {
- SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_intmux_suspend, imx_intmux_resume)
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(imx_intmux_runtime_suspend,
+ imx_intmux_runtime_resume, NULL)
};

static const struct of_device_id imx_intmux_id[] = {
--
2.17.1
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