linux-kernel - RE: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx platforms.

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Date:   Thu, 14 Dec 2023 04:08:13 +0000
From:   Sherry Sun <sherry.sun@....com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     Hongxing Zhu <hongxing.zhu@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
        "kw@...ux.com" <kw@...ux.com>, "robh@...nel.org" <robh@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx
 platforms.



> -----Original Message-----
> From: Bjorn Helgaas <helgaas@...nel.org>
> Sent: 2023年12月14日 3:58
> To: Sherry Sun <sherry.sun@....com>
> Cc: Hongxing Zhu <hongxing.zhu@....com>; l.stach@...gutronix.de;
> lpieralisi@...nel.org; kw@...ux.com; robh@...nel.org;
> bhelgaas@...gle.com; krzysztof.kozlowski+dt@...aro.org;
> conor+dt@...nel.org; shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; festevam@...il.com; dl-linux-imx <linux-
> imx@....com>; linux-pci@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH V2 1/4] PCI: imx6: Add pci host wakeup support on imx
> platforms.
> 
> Drop period at the end of subject line.  It only adds the possibility of
> unnecessary line wrapping in git log.

Hi Bjorn, thanks for the comments, will do in V3.

> 
> On Wed, Dec 13, 2023 at 05:28:47PM +0800, Sherry Sun wrote:
> > Add pci host wakeup feature for imx platforms.
> 
> s/pci/PCI/
> s/imx/i.MX/ (based on how nxp.com web pages refer to it)
> 

Will do.

> > Example of configuring the corresponding dts property under the PCI
> > node:
> > wake-gpios = <&gpio5 21 GPIO_ACTIVE_LOW>;
> 
> Add newline between paragraphs or wrap into a single paragraph.

Will do.

> 
> > +		/* host wakeup support */
> > +		imx6_pcie->host_wake_irq = -1;
> 
> AFAIK, 0 is an invalid IRQ value.  So why not drop this assignment since
> imx6_pcie->host_wake_irq is 0 by default since it was allocated with
> devm_kzalloc(), and test like this elsewhere:
> 
>   if (imx6_pcie->host_wake_irq) {
>     enable_irq_wake(imx6_pcie->host_wake_irq)

I plan to change the host_wake_irq to unsigned int type, and add following codes, then "if (imx6_pcie->host_wake_irq)" condition seems more reasonable, let me know if you have any further suggestions. thanks!
-                       imx6_pcie->host_wake_irq = gpiod_to_irq(host_wake_gpio);
+                       ret = gpiod_to_irq(host_wake_gpio);
+                       if (ret < 0)
+                               return dev_err_probe(dev, ret, "Failed to get IRQ for WAKE gpio\n");
+
+                       imx6_pcie->host_wake_irq = (unsigned int)ret;

> 
> > +		host_wake_gpio = devm_gpiod_get_optional(dev, "wake",
> GPIOD_IN);
> > +		if (IS_ERR(host_wake_gpio))
> > +			return PTR_ERR(host_wake_gpio);
> > +
> > +		if (host_wake_gpio != NULL) {
> 
>   if (host_wake_gpio)

Will do.

Best Regards
Sherry