linux-kernel - Re: [PATCH v6] gpio: bt8xx: use generic power management

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Message-ID: <20251022192901.GA1265216@bhelgaas>
Date: Wed, 22 Oct 2025 14:29:01 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Vaibhav Gupta <vaibhavgupta40@...il.com>, Michael Buesch <m@...s.ch>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] gpio: bt8xx: use generic power management

On Tue, Oct 21, 2025 at 10:48:48AM +0200, Bartosz Golaszewski wrote:
> On Thu, Oct 16, 2025 at 6:36 PM Vaibhav Gupta <vaibhavgupta40@...il.com> wrote:
> >
> > Switch to the generic PCI power management framework and remove legacy
> > callbacks like .suspend() and .resume(). With the generic framework, the
> > standard PCI related work like:
> >         - pci_save/restore_state()
> >         - pci_enable/disable_device()
> >         - pci_set_power_state()
> > is handled by the PCI core and this driver should implement only gpio-bt8xx
> > specific operations in its respective callback functions.
> >
> > Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
> > ---
> 
> This says it's a v6 but I have no idea what changed since v1. Please
> provide a changelog for every version when submitting patches.
> 
> Bjorn: does this look good to you?

Yes, it looks good to me.

Reviewed-by: Bjorn Helgaas <bhelgaas@...gle.com>

FWIW, here's the diff from v1 to v6.  Mostly just iterating on
compile warning nits:

diff --git a/drivers/gpio/gpio-bt8xx.c b/drivers/gpio/gpio-bt8xx.c
index e8d0c67bb618..324eeb77dbd5 100644
--- a/drivers/gpio/gpio-bt8xx.c
+++ b/drivers/gpio/gpio-bt8xx.c
@@ -52,10 +52,8 @@ struct bt8xxgpio {
 	struct pci_dev *pdev;
 	struct gpio_chip gpio;
 
-#ifdef CONFIG_PM
 	u32 saved_outen;
 	u32 saved_data;
-#endif
 };
 
 #define bgwrite(dat, adr)	writel((dat), bg->mmio+(adr))
@@ -224,7 +222,8 @@ static void bt8xxgpio_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
-static int __maybe_unused bt8xxgpio_suspend(struct device *dev)
+
+static int bt8xxgpio_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
@@ -241,7 +240,7 @@ static int __maybe_unused bt8xxgpio_suspend(struct device *dev)
 	return 0;
 }
 
-static int __maybe_unused bt8xxgpio_resume(struct device *dev)
+static int bt8xxgpio_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct bt8xxgpio *bg = pci_get_drvdata(pdev);
@@ -258,7 +257,7 @@ static int __maybe_unused bt8xxgpio_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
+static DEFINE_SIMPLE_DEV_PM_OPS(bt8xxgpio_pm_ops, bt8xxgpio_suspend, bt8xxgpio_resume);
 
 static const struct pci_device_id bt8xxgpio_pci_tbl[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BT848) },