[PATCH v3 0/5] This patch set did some clean up and add runtime pm support for flexspi driver

[PATCH v3 0/5] This patch set did some clean up and add runtime pm support for flexspi driver

[Haibo Chen]

PATCH1/3/4 to clean up the code, make the code more readable
PATCH2 add the runtime pm support
PATCH5 use devm_add_action_or_reset() to replace remove() callback, this can avoid
       oops when do bind/unbind test

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
Changes in v3:
- change the PATCH2, switch to use RUNTIME_PM_OPS instead of SET_RUNTIME_PM_OPS
  remove CONFIG_PM/CONFIG_PM_SLEEP, and use pm_ptr for PM ops
- fix a type for PATCH5
- Link to v2: https://lore.kernel.org/r/20250424-flexspipatch-v2-0-e9eb643e2286@nxp.com

Changes in v2:
- only change the PATCH2, add #ifdef CONFIG_PM_SLEEP for nxp_fspi_suspend() to avoid build error
  if CONFIG_PM=n and CONFIG_PM_SLEEP=y, no change for all other patches.
- Link to v1: https://lore.kernel.org/r/20250423-flexspipatch-v1-0-292e530509d3@nxp.com

---
Haibo Chen (4):
      spi: spi-nxp-fspi: remove the goto in probe
      spi: spi-nxp-fspi: enable runtime pm for fspi
      spi: spi-nxp-fspi: use guard(mutex) to simplify the code
      spi: spi-nxp-fspi: remove the unchecked return value for nxp_fspi_clk_disable_unprep

Han Xu (1):
      spi: nxp-fspi: use devm instead of remove for driver detach

 drivers/spi/spi-nxp-fspi.c | 189 ++++++++++++++++++++++++++-------------------
 1 file changed, 108 insertions(+), 81 deletions(-)
---
base-commit: 393d0c54cae31317deaa9043320c5fd9454deabc
change-id: 20250421-flexspipatch-1cf724d4213d

Best regards,
-- 
Haibo Chen <haibo.chen@nxp.com>

[PATCH v3 1/5] spi: spi-nxp-fspi: remove the goto in probe

[Haibo Chen]

Remove all the goto in probe to simplify the driver.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/spi/spi-nxp-fspi.c | 87 ++++++++++++++--------------------------------
 1 file changed, 27 insertions(+), 60 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index bad6b30bab0ecb90d0aaf603b6de5bc834d19de6..00da184be88a026bf562c9808e18e2335a0959e9 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -1161,10 +1161,10 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	struct resource *res;
 	struct nxp_fspi *f;
-	int ret;
+	int ret, irq;
 	u32 reg;
 
-	ctlr = spi_alloc_host(&pdev->dev, sizeof(*f));
+	ctlr = devm_spi_alloc_host(&pdev->dev, sizeof(*f));
 	if (!ctlr)
 		return -ENOMEM;
 
@@ -1174,10 +1174,8 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	f = spi_controller_get_devdata(ctlr);
 	f->dev = dev;
 	f->devtype_data = (struct nxp_fspi_devtype_data *)device_get_match_data(dev);
-	if (!f->devtype_data) {
-		ret = -ENODEV;
-		goto err_put_ctrl;
-	}
+	if (!f->devtype_data)
+		return -ENODEV;
 
 	platform_set_drvdata(pdev, f);
 
@@ -1186,11 +1184,8 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 		f->iobase = devm_platform_ioremap_resource(pdev, 0);
 	else
 		f->iobase = devm_platform_ioremap_resource_byname(pdev, "fspi_base");
-
-	if (IS_ERR(f->iobase)) {
-		ret = PTR_ERR(f->iobase);
-		goto err_put_ctrl;
-	}
+	if (IS_ERR(f->iobase))
+		return PTR_ERR(f->iobase);
 
 	/* find the resources - controller memory mapped space */
 	if (is_acpi_node(dev_fwnode(f->dev)))
@@ -1198,11 +1193,8 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	else
 		res = platform_get_resource_byname(pdev,
 				IORESOURCE_MEM, "fspi_mmap");
-
-	if (!res) {
-		ret = -ENODEV;
-		goto err_put_ctrl;
-	}
+	if (!res)
+		return -ENODEV;
 
 	/* assign memory mapped starting address and mapped size. */
 	f->memmap_phy = res->start;
@@ -1211,69 +1203,46 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	/* find the clocks */
 	if (dev_of_node(&pdev->dev)) {
 		f->clk_en = devm_clk_get(dev, "fspi_en");
-		if (IS_ERR(f->clk_en)) {
-			ret = PTR_ERR(f->clk_en);
-			goto err_put_ctrl;
-		}
+		if (IS_ERR(f->clk_en))
+			return PTR_ERR(f->clk_en);
 
 		f->clk = devm_clk_get(dev, "fspi");
-		if (IS_ERR(f->clk)) {
-			ret = PTR_ERR(f->clk);
-			goto err_put_ctrl;
-		}
-
-		ret = nxp_fspi_clk_prep_enable(f);
-		if (ret) {
-			dev_err(dev, "can not enable the clock\n");
-			goto err_put_ctrl;
-		}
+		if (IS_ERR(f->clk))
+			return PTR_ERR(f->clk);
 	}
 
+	/* find the irq */
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return dev_err_probe(dev, irq, "Failed to get irq source");
+
+	ret = nxp_fspi_clk_prep_enable(f);
+	if (ret)
+		return dev_err_probe(dev, ret, "Can't enable the clock\n");
+
 	/* Clear potential interrupts */
 	reg = fspi_readl(f, f->iobase + FSPI_INTR);
 	if (reg)
 		fspi_writel(f, reg, f->iobase + FSPI_INTR);
 
-	/* find the irq */
-	ret = platform_get_irq(pdev, 0);
-	if (ret < 0)
-		goto err_disable_clk;
+	nxp_fspi_default_setup(f);
 
-	ret = devm_request_irq(dev, ret,
+	ret = devm_request_irq(dev, irq,
 			nxp_fspi_irq_handler, 0, pdev->name, f);
 	if (ret) {
-		dev_err(dev, "failed to request irq: %d\n", ret);
-		goto err_disable_clk;
+		nxp_fspi_clk_disable_unprep(f);
+		return dev_err_probe(dev, ret, "Failed to request irq\n");
 	}
 
-	mutex_init(&f->lock);
+	devm_mutex_init(dev, &f->lock);
 
 	ctlr->bus_num = -1;
 	ctlr->num_chipselect = NXP_FSPI_MAX_CHIPSELECT;
 	ctlr->mem_ops = &nxp_fspi_mem_ops;
 	ctlr->mem_caps = &nxp_fspi_mem_caps;
-
-	nxp_fspi_default_setup(f);
-
 	ctlr->dev.of_node = np;
 
-	ret = devm_spi_register_controller(&pdev->dev, ctlr);
-	if (ret)
-		goto err_destroy_mutex;
-
-	return 0;
-
-err_destroy_mutex:
-	mutex_destroy(&f->lock);
-
-err_disable_clk:
-	nxp_fspi_clk_disable_unprep(f);
-
-err_put_ctrl:
-	spi_controller_put(ctlr);
-
-	dev_err(dev, "NXP FSPI probe failed\n");
-	return ret;
+	return devm_spi_register_controller(&pdev->dev, ctlr);
 }
 
 static void nxp_fspi_remove(struct platform_device *pdev)
@@ -1285,8 +1254,6 @@ static void nxp_fspi_remove(struct platform_device *pdev)
 
 	nxp_fspi_clk_disable_unprep(f);
 
-	mutex_destroy(&f->lock);
-
 	if (f->ahb_addr)
 		iounmap(f->ahb_addr);
 }

-- 
2.34.1

[PATCH v3 2/5] spi: spi-nxp-fspi: enable runtime pm for fspi

[Haibo Chen]

Enable the runtime PM in fspi driver.
Also for system PM, On some board like i.MX8ULP-EVK board,
after system suspend, IOMUX module will lost power, so all
the pinctrl setting will lost when system resume back, need
driver to save/restore the pinctrl setting.

Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/spi/spi-nxp-fspi.c | 93 +++++++++++++++++++++++++++++++++++++---------
 1 file changed, 76 insertions(+), 17 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 00da184be88a026bf562c9808e18e2335a0959e9..f7c3330a19009223cbffae8673d264246418e561 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -48,6 +48,8 @@
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
 #include <linux/pm_qos.h>
 #include <linux/regmap.h>
 #include <linux/sizes.h>
@@ -57,6 +59,9 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/spi-mem.h>
 
+/* runtime pm timeout */
+#define FSPI_RPM_TIMEOUT 50	/* 50ms */
+
 /* Registers used by the driver */
 #define FSPI_MCR0			0x00
 #define FSPI_MCR0_AHB_TIMEOUT(x)	((x) << 24)
@@ -394,6 +399,8 @@ struct nxp_fspi {
 	struct mutex lock;
 	struct pm_qos_request pm_qos_req;
 	int selected;
+#define FSPI_NEED_INIT		(1 << 0)
+	int flags;
 };
 
 static inline int needs_ip_only(struct nxp_fspi *f)
@@ -927,6 +934,13 @@ static int nxp_fspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 
 	mutex_lock(&f->lock);
 
+	err = pm_runtime_get_sync(f->dev);
+	if (err < 0) {
+		mutex_unlock(&f->lock);
+		dev_err(f->dev, "Failed to enable clock %d\n", __LINE__);
+		return err;
+	}
+
 	/* Wait for controller being ready. */
 	err = fspi_readl_poll_tout(f, f->iobase + FSPI_STS0,
 				   FSPI_STS0_ARB_IDLE, 1, POLL_TOUT, true);
@@ -955,8 +969,10 @@ static int nxp_fspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	/* Invalidate the data in the AHB buffer. */
 	nxp_fspi_invalid(f);
 
-	mutex_unlock(&f->lock);
+	pm_runtime_mark_last_busy(f->dev);
+	pm_runtime_put_autosuspend(f->dev);
 
+	mutex_unlock(&f->lock);
 	return err;
 }
 
@@ -1216,9 +1232,14 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return dev_err_probe(dev, irq, "Failed to get irq source");
 
-	ret = nxp_fspi_clk_prep_enable(f);
-	if (ret)
-		return dev_err_probe(dev, ret, "Can't enable the clock\n");
+	pm_runtime_enable(dev);
+	pm_runtime_set_autosuspend_delay(dev, FSPI_RPM_TIMEOUT);
+	pm_runtime_use_autosuspend(dev);
+
+	/* enable clock */
+	ret = pm_runtime_get_sync(f->dev);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to enable clock");
 
 	/* Clear potential interrupts */
 	reg = fspi_readl(f, f->iobase + FSPI_INTR);
@@ -1227,12 +1248,14 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 
 	nxp_fspi_default_setup(f);
 
+	ret = pm_runtime_put_sync(dev);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Failed to disable clock");
+
 	ret = devm_request_irq(dev, irq,
 			nxp_fspi_irq_handler, 0, pdev->name, f);
-	if (ret) {
-		nxp_fspi_clk_disable_unprep(f);
+	if (ret)
 		return dev_err_probe(dev, ret, "Failed to request irq\n");
-	}
 
 	devm_mutex_init(dev, &f->lock);
 
@@ -1249,29 +1272,70 @@ static void nxp_fspi_remove(struct platform_device *pdev)
 {
 	struct nxp_fspi *f = platform_get_drvdata(pdev);
 
+	/* enable clock first since there is reigster access */
+	pm_runtime_get_sync(f->dev);
+
 	/* disable the hardware */
 	fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0);
 
+	pm_runtime_disable(f->dev);
+	pm_runtime_put_noidle(f->dev);
 	nxp_fspi_clk_disable_unprep(f);
 
 	if (f->ahb_addr)
 		iounmap(f->ahb_addr);
 }
 
-static int nxp_fspi_suspend(struct device *dev)
+static int nxp_fspi_runtime_suspend(struct device *dev)
 {
+	struct nxp_fspi *f = dev_get_drvdata(dev);
+
+	nxp_fspi_clk_disable_unprep(f);
+
 	return 0;
 }
 
-static int nxp_fspi_resume(struct device *dev)
+static int nxp_fspi_runtime_resume(struct device *dev)
 {
 	struct nxp_fspi *f = dev_get_drvdata(dev);
+	int ret;
 
-	nxp_fspi_default_setup(f);
+	ret = nxp_fspi_clk_prep_enable(f);
+	if (ret)
+		return ret;
 
-	return 0;
+	if (f->flags & FSPI_NEED_INIT) {
+		nxp_fspi_default_setup(f);
+		ret = pinctrl_pm_select_default_state(dev);
+		if (ret)
+			dev_err(dev, "select flexspi default pinctrl failed!\n");
+		f->flags &= ~FSPI_NEED_INIT;
+	}
+
+	return ret;
 }
 
+static int nxp_fspi_suspend(struct device *dev)
+{
+	struct nxp_fspi *f = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pinctrl_pm_select_sleep_state(dev);
+	if (ret) {
+		dev_err(dev, "select flexspi sleep pinctrl failed!\n");
+		return ret;
+	}
+
+	f->flags |= FSPI_NEED_INIT;
+
+	return pm_runtime_force_suspend(dev);
+}
+
+static const struct dev_pm_ops nxp_fspi_pm_ops = {
+	RUNTIME_PM_OPS(nxp_fspi_runtime_suspend, nxp_fspi_runtime_resume, NULL)
+	SYSTEM_SLEEP_PM_OPS(nxp_fspi_suspend, pm_runtime_force_resume)
+};
+
 static const struct of_device_id nxp_fspi_dt_ids[] = {
 	{ .compatible = "nxp,lx2160a-fspi", .data = (void *)&lx2160a_data, },
 	{ .compatible = "nxp,imx8mm-fspi", .data = (void *)&imx8mm_data, },
@@ -1291,17 +1355,12 @@ static const struct acpi_device_id nxp_fspi_acpi_ids[] = {
 MODULE_DEVICE_TABLE(acpi, nxp_fspi_acpi_ids);
 #endif
 
-static const struct dev_pm_ops nxp_fspi_pm_ops = {
-	.suspend	= nxp_fspi_suspend,
-	.resume		= nxp_fspi_resume,
-};
-
 static struct platform_driver nxp_fspi_driver = {
 	.driver = {
 		.name	= "nxp-fspi",
 		.of_match_table = nxp_fspi_dt_ids,
 		.acpi_match_table = ACPI_PTR(nxp_fspi_acpi_ids),
-		.pm =   &nxp_fspi_pm_ops,
+		.pm = pm_ptr(&nxp_fspi_pm_ops),
 	},
 	.probe          = nxp_fspi_probe,
 	.remove		= nxp_fspi_remove,

-- 
2.34.1

[PATCH v3 3/5] spi: spi-nxp-fspi: use guard(mutex) to simplify the code

[Haibo Chen]

Use guard(mutex) to simplify the code logic.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/spi/spi-nxp-fspi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index f7c3330a19009223cbffae8673d264246418e561..ca0b51a254c15f45a9e91907900d94d77f1d5dff 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -932,11 +932,10 @@ static int nxp_fspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	struct nxp_fspi *f = spi_controller_get_devdata(mem->spi->controller);
 	int err = 0;
 
-	mutex_lock(&f->lock);
+	guard(mutex)(&f->lock);
 
 	err = pm_runtime_get_sync(f->dev);
 	if (err < 0) {
-		mutex_unlock(&f->lock);
 		dev_err(f->dev, "Failed to enable clock %d\n", __LINE__);
 		return err;
 	}
@@ -972,7 +971,6 @@ static int nxp_fspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 	pm_runtime_mark_last_busy(f->dev);
 	pm_runtime_put_autosuspend(f->dev);
 
-	mutex_unlock(&f->lock);
 	return err;
 }
 

-- 
2.34.1

[PATCH v3 4/5] spi: spi-nxp-fspi: remove the unchecked return value for nxp_fspi_clk_disable_unprep

[Haibo Chen]

For nxp_fspi_clk_disable_unprep(), no caller check the return value,
so remove the unchecked return value.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/spi/spi-nxp-fspi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index ca0b51a254c15f45a9e91907900d94d77f1d5dff..0ea04e77a968b9c8dbd73a76984022a8f9e9b178 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -634,15 +634,15 @@ static int nxp_fspi_clk_prep_enable(struct nxp_fspi *f)
 	return 0;
 }
 
-static int nxp_fspi_clk_disable_unprep(struct nxp_fspi *f)
+static void nxp_fspi_clk_disable_unprep(struct nxp_fspi *f)
 {
 	if (is_acpi_node(dev_fwnode(f->dev)))
-		return 0;
+		return;
 
 	clk_disable_unprepare(f->clk);
 	clk_disable_unprepare(f->clk_en);
 
-	return 0;
+	return;
 }
 
 static void nxp_fspi_dll_calibration(struct nxp_fspi *f)

-- 
2.34.1

[PATCH v3 5/5] spi: nxp-fspi: use devm instead of remove for driver detach

[Haibo Chen]

From: Han Xu <han.xu@nxp.com>

fspi driver use devm APIs to manage clk/irq/resources and register the spi
controller, but the legacy remove function will be called first during
device detach and trigger kernel panic. Drop the remove function and use
devm_add_action_or_reset() for driver cleanup to ensure the release
sequence.

Signed-off-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/spi/spi-nxp-fspi.c | 41 ++++++++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 0ea04e77a968b9c8dbd73a76984022a8f9e9b178..e63c77e418231cd0698ffb73eeeebfbe63cc3065 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -1168,6 +1168,24 @@ static const struct spi_controller_mem_caps nxp_fspi_mem_caps = {
 	.per_op_freq = true,
 };
 
+static void nxp_fspi_cleanup(void *data)
+{
+	struct nxp_fspi *f = data;
+
+	/* enable clock first since there is register access */
+	pm_runtime_get_sync(f->dev);
+
+	/* disable the hardware */
+	fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0);
+
+	pm_runtime_disable(f->dev);
+	pm_runtime_put_noidle(f->dev);
+	nxp_fspi_clk_disable_unprep(f);
+
+	if (f->ahb_addr)
+		iounmap(f->ahb_addr);
+}
+
 static int nxp_fspi_probe(struct platform_device *pdev)
 {
 	struct spi_controller *ctlr;
@@ -1263,25 +1281,11 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	ctlr->mem_caps = &nxp_fspi_mem_caps;
 	ctlr->dev.of_node = np;
 
-	return devm_spi_register_controller(&pdev->dev, ctlr);
-}
-
-static void nxp_fspi_remove(struct platform_device *pdev)
-{
-	struct nxp_fspi *f = platform_get_drvdata(pdev);
-
-	/* enable clock first since there is reigster access */
-	pm_runtime_get_sync(f->dev);
-
-	/* disable the hardware */
-	fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0);
-
-	pm_runtime_disable(f->dev);
-	pm_runtime_put_noidle(f->dev);
-	nxp_fspi_clk_disable_unprep(f);
+	ret = devm_add_action_or_reset(dev, nxp_fspi_cleanup, f);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register nxp_fspi_cleanup\n");
 
-	if (f->ahb_addr)
-		iounmap(f->ahb_addr);
+	return devm_spi_register_controller(&pdev->dev, ctlr);
 }
 
 static int nxp_fspi_runtime_suspend(struct device *dev)
@@ -1361,7 +1365,6 @@ static struct platform_driver nxp_fspi_driver = {
 		.pm = pm_ptr(&nxp_fspi_pm_ops),
 	},
 	.probe          = nxp_fspi_probe,
-	.remove		= nxp_fspi_remove,
 };
 module_platform_driver(nxp_fspi_driver);
 

-- 
2.34.1

Re: [PATCH v3 2/5] spi: spi-nxp-fspi: enable runtime pm for fspi

[ALOK TIWARI]

On 28-04-2025 15:36, Haibo Chen wrote:
> @@ -1249,29 +1272,70 @@ static void nxp_fspi_remove(struct platform_device *pdev)
>   {
>   	struct nxp_fspi *f = platform_get_drvdata(pdev);
>   
> +	/* enable clock first since there is reigster access */

typo reigster -> register

> +	pm_runtime_get_sync(f->dev);
> +
>   	/* disable the hardware */
>   	fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0);

Thanks,
Alok

Re: [PATCH v3 2/5] spi: spi-nxp-fspi: enable runtime pm for fspi

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 472 bytes --]

On Mon, Apr 28, 2025 at 06:06:44PM +0800, Haibo Chen wrote:
> Enable the runtime PM in fspi driver.
> Also for system PM, On some board like i.MX8ULP-EVK board,
> after system suspend, IOMUX module will lost power, so all
> the pinctrl setting will lost when system resume back, need
> driver to save/restore the pinctrl setting.

I think I would expect the pinctrl driver to deal with restoring the pin
status over resume?  But perhaps that's not the way that API works?

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

RE: [PATCH v3 2/5] spi: spi-nxp-fspi: enable runtime pm for fspi

[Bough Chen]

> -----Original Message-----
> From: Mark Brown <broonie@kernel.org>
> Sent: 2025年5月2日 4:47
> To: Bough Chen <haibo.chen@nxp.com>
> Cc: Han Xu <han.xu@nxp.com>; Yogesh Gaur <yogeshgaur.83@gmail.com>;
> linux-spi@vger.kernel.org; imx@lists.linux.dev; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v3 2/5] spi: spi-nxp-fspi: enable runtime pm for fspi
> 
> On Mon, Apr 28, 2025 at 06:06:44PM +0800, Haibo Chen wrote:
> > Enable the runtime PM in fspi driver.
> > Also for system PM, On some board like i.MX8ULP-EVK board, after
> > system suspend, IOMUX module will lost power, so all the pinctrl
> > setting will lost when system resume back, need driver to save/restore
> > the pinctrl setting.
> 
> I think I would expect the pinctrl driver to deal with restoring the pin status over
> resume?  But perhaps that's not the way that API works?

Hi Mark,

I check the pinctrl driver, seems pinctrl only support to save/restore the hog pad, refer to pinctrl_force_sleep/pinctrl_force_default, for other pad which driver owned, need driver to handle, refer to pinctrl_pm_select_sleep_state/pinctrl_pm_select_default_state. 

Regards
Haibo Chen

Re: [PATCH v3 0/5] This patch set did some clean up and add runtime pm support for flexspi driver

[Mark Brown]

On Mon, 28 Apr 2025 18:06:42 +0800, Haibo Chen wrote:
> PATCH1/3/4 to clean up the code, make the code more readable
> PATCH2 add the runtime pm support
> PATCH5 use devm_add_action_or_reset() to replace remove() callback, this can avoid
>        oops when do bind/unbind test
> 
> 

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/5] spi: spi-nxp-fspi: remove the goto in probe
      commit: 48900813abd2730a35c6e3afd1609bafac5271cc
[2/5] spi: spi-nxp-fspi: enable runtime pm for fspi
      commit: 97be4b919a609fc8c4bd1118502b5d26cc2f77c4
[3/5] spi: spi-nxp-fspi: use guard(mutex) to simplify the code
      commit: 93be516f819dcb1fdac035566381d8899d4b389c
[4/5] spi: spi-nxp-fspi: remove the unchecked return value for nxp_fspi_clk_disable_unprep
      commit: e0558eb74c6e082b60e03981eb7cbf0fc3780ef4
[5/5] spi: nxp-fspi: use devm instead of remove for driver detach
      commit: 9f7cd1bcb6363368abc954ff4e727b579813c697

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark