Re: [PATCH 3/5] PCI/pwrctrl: tc9563: add GPIO auxiliary device support

[Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>]

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> On Tue, 1 Sep 2026 12:27:55 +0200, Lorenzo Bianconi
> <lorenzo.bianconi@oss.qualcomm.com> said:
> > The TC9563 embeds a GPIO controller used for per-port reset signals.
> > Create an auxiliary device for it so the gpio-tc9563 driver can
> > register the GPIO chip and enable DT-based GPIO lookups. Pass the
> > tc9563 regmap to the auxiliary device as its platform data.
> >
> > The downstream port DT parsing loop gains an of_node_is_type() filter
> > to skip non-PCI child nodes such as the GPIO controller node.
> >
> > The pwrctrl driver does not wait for the GPIO chip to be probed. The
> > per-port reset GPIO lookup, returning -EPROBE_DEFER until the chip is
> > registered, is added in the next patch.
> >
> > Select AUXILIARY_BUS and GPIO_TC9563 in Kconfig.
> >
> > Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>
> > ---
> >  drivers/pci/pwrctrl/Kconfig              |  2 +
> >  drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c | 78 ++++++++++++++++++++++++++++++--
> >  2 files changed, 77 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/pci/pwrctrl/Kconfig b/drivers/pci/pwrctrl/Kconfig
> > index 1952ab4f29b6..a07694fae0c9 100644
> > --- a/drivers/pci/pwrctrl/Kconfig
> > +++ b/drivers/pci/pwrctrl/Kconfig
> > @@ -30,6 +30,8 @@ config PCI_PWRCTRL_TC9563
> >  	default m if ARCH_QCOM
> >  	depends on I2C
> >  	select REGMAP_I2C
> > +	select AUXILIARY_BUS
> > +	select GPIO_TC9563
> 
> I think this should depend on it, not select it?

ack, I will fix it in v2.

> 
> >  	help
> >  	  Say Y here to enable the PCI Power Control driver of TC9563 PCIe
> >  	  switch.
> > diff --git a/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c b/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c
> > index b0d8912690a2..ee9c26b8f5cb 100644
> > --- a/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c
> > +++ b/drivers/pci/pwrctrl/pci-pwrctrl-tc9563.c
> > @@ -4,11 +4,13 @@
> >   */
> >
> >  #include <linux/array_size.h>
> > +#include <linux/auxiliary_bus.h>
> >  #include <linux/bitfield.h>
> >  #include <linux/bits.h>
> >  #include <linux/delay.h>
> >  #include <linux/device.h>
> >  #include <linux/gpio/consumer.h>
> > +#include <linux/gpio/driver.h>
> >  #include <linux/i2c.h>
> >  #include <linux/module.h>
> >  #include <linux/of.h>
> > @@ -20,12 +22,10 @@
> >  #include <linux/regulator/consumer.h>
> >  #include <linux/string.h>
> >  #include <linux/types.h>
> > +#include <linux/soc/qcom/tc9563.h>
> >
> >  #include "../pci.h"
> >
> > -#define TC9563_GPIO_CONFIG		0x801208
> > -#define TC9563_RESET_GPIO		0x801210
> > -
> >  #define TC9563_PORT_L0S_DELAY		0x82496c
> >  #define TC9563_PORT_L1_DELAY		0x824970
> >
> > @@ -393,6 +393,71 @@ static int tc9563_pwrctrl_parse_device_dt(struct device_node *node,
> >  	return 0;
> >  }
> >
> > +static void tc9563_pwrctrl_adev_release(struct device *dev)
> > +{
> > +	struct auxiliary_device *adev = to_auxiliary_dev(dev);
> > +
> > +	of_node_put(adev->dev.of_node);
> > +	kfree(adev);
> > +}
> > +
> > +static void tc9563_pwrctrl_adev_remove(void *data)
> > +{
> > +	struct auxiliary_device *adev = data;
> > +
> > +	auxiliary_device_delete(adev);
> > +	auxiliary_device_uninit(adev);
> > +}
> > +
> > +static int tc9563_pwrctrl_adev_add(struct device *dev, const char *name,
> > +				   u32 id, struct device_node *of_node,
> > +				   void *priv_data)
> > +{
> > +	struct auxiliary_device *adev;
> > +	int ret;
> > +
> > +	adev = kzalloc_obj(*adev);
> > +	if (!adev) {
> > +		of_node_put(of_node);
> 
> This is a bit confusing. You get the node in tc9563_pwrctrl_add_gpio_adev() but
> you put it here. Please either do both here or there.

ack, I will fix it in v2.

Regards,
Lorenzo

> 
> > +		return -ENOMEM;
> > +	}
> > +
> > +	adev->id = id;
> > +	adev->name = name;
> > +	adev->dev.parent = dev;
> > +	adev->dev.platform_data = priv_data;
> > +	adev->dev.release = tc9563_pwrctrl_adev_release;
> > +	adev->dev.of_node = of_node;
> > +
> > +	ret = auxiliary_device_init(adev);
> > +	if (ret) {
> > +		of_node_put(of_node);
> > +		kfree(adev);
> > +		return ret;
> > +	}
> > +
> > +	ret = auxiliary_device_add(adev);
> > +	if (ret) {
> > +		auxiliary_device_uninit(adev);
> > +		return ret;
> > +	}
> > +
> > +	return devm_add_action_or_reset(dev, tc9563_pwrctrl_adev_remove, adev);
> > +}
> > +
> > +static int tc9563_pwrctrl_add_gpio_adev(struct tc9563_pwrctrl *tc9563)
> > +{
> > +	struct device *dev = tc9563->pwrctrl.dev;
> > +	struct device_node *node;
> > +
> > +	node = to_of_node(gpiochip_node_get_first(dev));
> > +	if (!node)
> > +		return 0;
> > +
> > +	return tc9563_pwrctrl_adev_add(dev, TC9563_GPIO_DEV_NAME, 0, node,
> > +				       tc9563->regmap);
> > +}
> > +
> >  static int tc9563_pwrctrl_power_off(struct pci_pwrctrl *pwrctrl)
> >  {
> >  	struct tc9563_pwrctrl *tc9563 = container_of(pwrctrl,
> > @@ -565,6 +630,9 @@ static int tc9563_pwrctrl_probe(struct platform_device *pdev)
> >  	 */
> >  	port = TC9563_USP;
> >  	for_each_child_of_node_scoped(node, child) {
> > +		if (!of_node_is_type(child, "pci"))
> > +			continue;
> > +
> >  		if (++port >= TC9563_MAX)
> >  			break;
> >
> > @@ -596,6 +664,10 @@ static int tc9563_pwrctrl_probe(struct platform_device *pdev)
> >  	tc9563->pwrctrl.power_on = tc9563_pwrctrl_power_on;
> >  	tc9563->pwrctrl.power_off = tc9563_pwrctrl_power_off;
> >
> > +	ret = tc9563_pwrctrl_add_gpio_adev(tc9563);
> > +	if (ret)
> > +		goto remove_i2c;
> > +
> >  	ret = devm_pci_pwrctrl_device_set_ready(dev, &tc9563->pwrctrl);
> >  	if (ret)
> >  		goto power_off;
> >
> > --
> > 2.55.0
> >
> >
> 
> Bart

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