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Date: Wed, 26 Oct 2022 14:20:11 +0800
From: Peng Fan <peng.fan@....com>
To: Shenwei Wang <shenwei.wang@....com>
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Dong Aisheng <aisheng.dong@....com>,
Jacky Bai <ping.bai@....com>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, imx@...ts.linux.dev
Subject: Re: [PATCH v3 5/5] gpio: mxc: enable pad wakeup on i.MX8x platforms
On Tue, Oct 25, 2022 at 01:32:44PM -0500, Shenwei Wang wrote:
>On i.MX8QM/QXP/DXL SoCs, even a GPIO is selected as the wakeup source,
>the GPIO block will be powered off when system enters into suspend
>state. This can greatly reduce the power consumption of suspend state
>because the whole partition can be shutdown. This is called PAD wakeup
>feature on i.MX8x platform.
>
>This patch adds the noirq suspend/resume hooks and uses the pad wakeup
>feature as the default wakeup method for GPIO modules on
>i.MX8QM/QXP/DXL platforms.
>
>Signed-off-by: Shenwei Wang <shenwei.wang@....com>
>---
> drivers/gpio/gpio-mxc.c | 91 ++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 90 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
>index c871602fc5ba..a6fe5ed3d320 100644
>--- a/drivers/gpio/gpio-mxc.c
>+++ b/drivers/gpio/gpio-mxc.c
>@@ -24,6 +24,12 @@
> #include <linux/of_device.h>
> #include <linux/bug.h>
>
>+#define IMX_SCU_WAKEUP_OFF 0
>+#define IMX_SCU_WAKEUP_LOW_LVL 4
>+#define IMX_SCU_WAKEUP_FALL_EDGE 5
>+#define IMX_SCU_WAKEUP_RISE_EDGE 6
>+#define IMX_SCU_WAKEUP_HIGH_LVL 7
>+
> /* device type dependent stuff */
> struct mxc_gpio_hwdata {
> unsigned dr_reg;
>@@ -61,6 +67,9 @@ struct mxc_gpio_port {
> u32 both_edges;
> struct mxc_gpio_reg_saved gpio_saved_reg;
> bool power_off;
>+ u32 wakeup_pads;
>+ bool is_pad_wakeup;
>+ u32 pad_type[32];
> const struct mxc_gpio_hwdata *hwdata;
> };
>
>@@ -130,6 +139,9 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
> { .compatible = "fsl,imx31-gpio", .data = &imx31_gpio_hwdata },
> { .compatible = "fsl,imx35-gpio", .data = &imx35_gpio_hwdata },
> { .compatible = "fsl,imx7d-gpio", .data = &imx35_gpio_hwdata },
>+ { .compatible = "fsl,imx8dxl-gpio", .data = &imx35_gpio_hwdata },
>+ { .compatible = "fsl,imx8qm-gpio", .data = &imx35_gpio_hwdata },
>+ { .compatible = "fsl,imx8qxp-gpio", .data = &imx35_gpio_hwdata },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids);
>@@ -203,6 +215,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
> }
>
> writel(1 << gpio_idx, port->base + GPIO_ISR);
>+ port->pad_type[gpio_idx] = type;
>
> return 0;
> }
>@@ -254,6 +267,9 @@ static void mx3_gpio_irq_handler(struct irq_desc *desc)
> struct mxc_gpio_port *port = irq_desc_get_handler_data(desc);
> struct irq_chip *chip = irq_desc_get_chip(desc);
>
>+ if (port->is_pad_wakeup)
>+ return;
>+
> chained_irq_enter(chip, desc);
>
> irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR);
>@@ -306,11 +322,13 @@ static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
> ret = enable_irq_wake(port->irq_high);
> else
> ret = enable_irq_wake(port->irq);
>+ port->wakeup_pads |= (1<<gpio_idx);
"1 << gpio_idx"
> } else {
> if (port->irq_high && (gpio_idx >= 16))
> ret = disable_irq_wake(port->irq_high);
> else
> ret = disable_irq_wake(port->irq);
>+ port->wakeup_pads &= ~(1<<gpio_idx);
"1 << gpio_idx"
> }
>
> return ret;
>@@ -365,7 +383,6 @@ static int mxc_gpio_probe(struct platform_device *pdev)
> return -ENOMEM;
>
> port->dev = &pdev->dev;
>-
> port->hwdata = device_get_match_data(&pdev->dev);
>
> port->base = devm_platform_ioremap_resource(pdev, 0);
>@@ -498,6 +515,77 @@ static void mxc_gpio_restore_regs(struct mxc_gpio_port *port)
> writel(port->gpio_saved_reg.dr, port->base + GPIO_DR);
> }
>
>+static int mxc_gpio_generic_config(struct mxc_gpio_port *port,
>+ unsigned int offset, unsigned long config)
>+{
>+ struct device_node *np = port->dev->of_node;
>+
>+ if (of_device_is_compatible(np, "fsl,imx8dxl-gpio") ||
>+ of_device_is_compatible(np, "fsl,imx8qxp-gpio") ||
>+ of_device_is_compatible(np, "fsl,imx8qm-gpio"))
>+ return gpiochip_generic_config(&port->gc, offset, config);
checkpatch should report warning.
>+
>+ return 0;
>+}
>+
>+static void mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable)
>+{
>+ unsigned long config;
>+ int i, type;
>+
>+ static const u32 pad_type_map[] = {
>+ IMX_SCU_WAKEUP_OFF, /* 0 */
>+ IMX_SCU_WAKEUP_RISE_EDGE, /* IRQ_TYPE_EDGE_RISING */
>+ IMX_SCU_WAKEUP_FALL_EDGE, /* IRQ_TYPE_EDGE_FALLING */
>+ IMX_SCU_WAKEUP_FALL_EDGE, /* IRQ_TYPE_EDGE_BOTH */
>+ IMX_SCU_WAKEUP_HIGH_LVL, /* IRQ_TYPE_LEVEL_HIGH */
>+ IMX_SCU_WAKEUP_OFF, /* 5 */
>+ IMX_SCU_WAKEUP_OFF, /* 6 */
>+ IMX_SCU_WAKEUP_OFF, /* 7 */
>+ IMX_SCU_WAKEUP_LOW_LVL, /* IRQ_TYPE_LEVEL_LOW */
>+ };
>+
>+ for (i = 0; i < 32; i++) {
>+ if ((port->wakeup_pads & (1<<i))) {
>+ type = port->pad_type[i];
>+ if (enable)
>+ config = pad_type_map[type];
>+ else
>+ config = IMX_SCU_WAKEUP_OFF;
>+ mxc_gpio_generic_config(port, i, config);
>+ }
>+ }
>+}
>+
>+static int __maybe_unused mxc_gpio_noirq_suspend(struct device *dev)
>+{
>+ struct platform_device *pdev = to_platform_device(dev);
>+ struct mxc_gpio_port *port = platform_get_drvdata(pdev);
>+
>+ if (port->wakeup_pads > 0) {
>+ mxc_gpio_set_pad_wakeup(port, true);
>+ port->is_pad_wakeup = true;
>+ }
>+
>+ return 0;
>+}
>+
>+static int __maybe_unused mxc_gpio_noirq_resume(struct device *dev)
>+{
>+ struct platform_device *pdev = to_platform_device(dev);
>+ struct mxc_gpio_port *port = platform_get_drvdata(pdev);
>+
>+ if (port->wakeup_pads > 0)
>+ mxc_gpio_set_pad_wakeup(port, false);
>+ port->is_pad_wakeup = false;
>+
>+ return 0;
>+}
>+
>+static const struct dev_pm_ops mxc_gpio_dev_pm_ops = {
>+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mxc_gpio_noirq_suspend, mxc_gpio_noirq_resume)
>+};
>+
> static int mxc_gpio_syscore_suspend(void)
> {
> struct mxc_gpio_port *port;
>@@ -537,6 +625,7 @@ static struct platform_driver mxc_gpio_driver = {
> .name = "gpio-mxc",
> .of_match_table = mxc_gpio_dt_ids,
> .suppress_bind_attrs = true,
>+ .pm = &mxc_gpio_dev_pm_ops,
> },
> .probe = mxc_gpio_probe,
> };
Except the format issue, patch looks good to me.
Regards,
Peng.
>--
>2.34.1
>
--
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