linux-kernel - Re: [PATCH v3] PCI: imx6: Replace legacy gpio interface for gpiod interface

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Date:   Fri, 8 Apr 2022 11:46:32 -0300
From:   Maíra Canal <maira.canal@....br>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     l.stach@...gutronix.de, hongxing.zhu@....com, robh@...nel.org,
        bhelgaas@...gle.com, helgaas@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, linux-imx@....com,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] PCI: imx6: Replace legacy gpio interface for gpiod
 interface

On Fri, Apr 08, 2022 at 03:23:39PM +0100, Lorenzo Pieralisi wrote:
> On Mon, Nov 01, 2021 at 10:03:11PM -0300, Maíra Canal wrote:
> > Considering the current transition of the GPIO subsystem, remove all
> > dependencies of the legacy GPIO interface (linux/gpio.h and linux
> > /of_gpio.h) and replace it with the descriptor-based GPIO approach.
> > 
> > Signed-off-by: Maíra Canal <maira.canal@....br>
> > ---
> > V1 -> V2: Rewrite commit log and subject line to match PCI subsystem standard
> > V2 -> v3: Change gpiod_set_value_cansleep for gpiod_set_raw_value_cansleep
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 30 +++++++++------------------
> >  1 file changed, 10 insertions(+), 20 deletions(-)
> 
> Maira, Lucas,
> 
> what's this patch status ? Please let me know.


Lorenzo,

Thank you for the feedback. Since I sent v3, I didn't get any feedback from the community.

If you have any feedback, I would gladly work on it.

Thanks,
Maíra Canal

> 
> Thanks,
> Lorenzo
> 
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> > index 80fc98acf097..f08865ac0b40 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -11,13 +11,12 @@
> >  #include <linux/bitfield.h>
> >  #include <linux/clk.h>
> >  #include <linux/delay.h>
> > -#include <linux/gpio.h>
> > +#include <linux/gpio/consumer.h>
> >  #include <linux/kernel.h>
> >  #include <linux/mfd/syscon.h>
> >  #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
> >  #include <linux/mfd/syscon/imx7-iomuxc-gpr.h>
> >  #include <linux/module.h>
> > -#include <linux/of_gpio.h>
> >  #include <linux/of_device.h>
> >  #include <linux/of_address.h>
> >  #include <linux/pci.h>
> > @@ -63,7 +62,7 @@ struct imx6_pcie_drvdata {
> >  
> >  struct imx6_pcie {
> >  	struct dw_pcie		*pci;
> > -	int			reset_gpio;
> > +	struct gpio_desc	*reset_gpio;
> >  	bool			gpio_active_high;
> >  	struct clk		*pcie_bus;
> >  	struct clk		*pcie_phy;
> > @@ -526,11 +525,11 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> >  	usleep_range(200, 500);
> >  
> >  	/* Some boards don't have PCIe reset GPIO. */
> > -	if (gpio_is_valid(imx6_pcie->reset_gpio)) {
> > -		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
> > +	if (imx6_pcie->reset_gpio) {
> > +		gpiod_set_raw_value_cansleep(imx6_pcie->reset_gpio,
> >  					imx6_pcie->gpio_active_high);
> >  		msleep(100);
> > -		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
> > +		gpiod_set_raw_value_cansleep(imx6_pcie->reset_gpio,
> >  					!imx6_pcie->gpio_active_high);
> >  	}
> >  
> > @@ -1025,22 +1024,13 @@ static int imx6_pcie_probe(struct platform_device *pdev)
> >  		return PTR_ERR(pci->dbi_base);
> >  
> >  	/* Fetch GPIOs */
> > -	imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
> >  	imx6_pcie->gpio_active_high = of_property_read_bool(node,
> >  						"reset-gpio-active-high");
> > -	if (gpio_is_valid(imx6_pcie->reset_gpio)) {
> > -		ret = devm_gpio_request_one(dev, imx6_pcie->reset_gpio,
> > -				imx6_pcie->gpio_active_high ?
> > -					GPIOF_OUT_INIT_HIGH :
> > -					GPIOF_OUT_INIT_LOW,
> > -				"PCIe reset");
> > -		if (ret) {
> > -			dev_err(dev, "unable to get reset gpio\n");
> > -			return ret;
> > -		}
> > -	} else if (imx6_pcie->reset_gpio == -EPROBE_DEFER) {
> > -		return imx6_pcie->reset_gpio;
> > -	}
> > +	imx6_pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset",
> > +			imx6_pcie->gpio_active_high ?  GPIOD_OUT_HIGH : GPIOD_OUT_LOW);
> > +	if (IS_ERR(imx6_pcie->reset_gpio))
> > +		return dev_err_probe(dev, PTR_ERR(imx6_pcie->reset_gpio),
> > +				"unable to get reset gpio\n");
> >  
> >  	/* Fetch clocks */
> >  	imx6_pcie->pcie_phy = devm_clk_get(dev, "pcie_phy");
> > -- 
> > 2.31.1
> >