linux-kernel - Re: [PATCH v2 1/2] dt-bindings: pci: add DT binding for Axis ARTPEC-6 PCIe controller

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Date:	Mon, 13 Jun 2016 15:30:53 +0200
From:	Niklas Cassel <niklas.cassel@...s.com>
To:	Bjorn Helgaas <helgaas@...nel.org>
CC:	<jespern@...s.com>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <linux-arm-kernel@...s.com>,
	<linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] dt-bindings: pci: add DT binding for Axis ARTPEC-6
 PCIe controller


On 06/11/2016 09:10 PM, Bjorn Helgaas wrote:
> On Mon, May 09, 2016 at 01:48:27PM +0200, Niklas Cassel wrote:
>> From: Niklas Cassel <niklas.cassel@...s.com>
>>
>> This commit adds the Device Tree binding documentation that allows to
>> describe the PCIe controller found in the Axis ARTPEC-6 SoC.
>>
>> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> I applied both of these, with Rob's ack on the first, to
> pci/host-artpec for v4.8, thanks!
>
> I made the following minor edits; hopefully I didn't break anything:

Hello Bjorn,

Your changes look good.

Thank you for reviewing and applying :)

(By the way, I couldn't find pci/host-artpec on
https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/
but I suppose that you just haven't pushed your local branches yet.)

>
> diff --git a/Documentation/devicetree/bindings/pci/axis,artpec6-pcie.txt b/Documentation/devicetree/bindings/pci/axis,artpec6-pcie.txt
> index f91b916..330a45b 100644
> --- a/Documentation/devicetree/bindings/pci/axis,artpec6-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/axis,artpec6-pcie.txt
> @@ -1,11 +1,11 @@
>  * Axis ARTPEC-6 PCIe interface
>  
> -This PCIe host controller is based on the Synopsys Designware PCIe IP
> +This PCIe host controller is based on the Synopsys DesignWare PCIe IP
>  and thus inherits all the common properties defined in designware-pcie.txt.
>  
>  Required properties:
>  - compatible: "axis,artpec6-pcie", "snps,dw-pcie"
> -- reg: base addresses and lengths of the pcie controller (DBI),
> +- reg: base addresses and lengths of the PCIe controller (DBI),
>  	the phy controller, and configuration address space.
>  - reg-names: Must include the following entries:
>  	- "dbi"
> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
> index 1a2de8f..033d9ad 100644
> --- a/drivers/pci/host/Kconfig
> +++ b/drivers/pci/host/Kconfig
> @@ -250,5 +250,8 @@ config PCIE_ARTPEC6
>  	depends on MACH_ARTPEC6
>  	select PCIE_DW
>  	select PCIEPORTBUS
> +	help
> +	  Say Y here to enable PCIe controller support on Axis ARTPEC-6
> +	  SoCs.  This PCIe controller uses the DesignWare core.
>  
>  endmenu
> diff --git a/drivers/pci/host/pcie-artpec6.c b/drivers/pci/host/pcie-artpec6.c
> index d53dbaf..19adc77 100644
> --- a/drivers/pci/host/pcie-artpec6.c
> +++ b/drivers/pci/host/pcie-artpec6.c
> @@ -61,7 +61,7 @@ struct artpec6_pcie {
>  #define PHY_STATUS			0x118
>  #define PHY_COSPLLLOCK			(1 << 0)
>  
> -#define ARTPEC6_CPU_TO_BUS_ADDR		0x0FFFFFFF
> +#define ARTPEC6_CPU_TO_BUS_ADDR		0x0fffffff
>  
>  static int artpec6_pcie_establish_link(struct pcie_port *pp)
>  {
> @@ -241,35 +241,26 @@ static int __init artpec6_pcie_probe(struct platform_device *pdev)
>  
>  	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
>  	pp->dbi_base = devm_ioremap_resource(&pdev->dev, dbi_base);
> -	if (IS_ERR(pp->dbi_base)) {
> -		ret = PTR_ERR(pp->dbi_base);
> -		goto fail;
> -	}
> +	if (IS_ERR(pp->dbi_base))
> +		return PTR_ERR(pp->dbi_base);
>  
>  	phy_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
>  	artpec6_pcie->phy_base = devm_ioremap_resource(&pdev->dev, phy_base);
> -	if (IS_ERR(artpec6_pcie->phy_base)) {
> -		ret = PTR_ERR(artpec6_pcie->phy_base);
> -		goto fail;
> -	}
> +	if (IS_ERR(artpec6_pcie->phy_base))
> +		return PTR_ERR(artpec6_pcie->phy_base);
>  
>  	artpec6_pcie->regmap =
>  		syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
>  						"axis,syscon-pcie");
> -	if (IS_ERR(artpec6_pcie->regmap)) {
> -		ret = PTR_ERR(artpec6_pcie->regmap);
> -		goto fail;
> -	}
> +	if (IS_ERR(artpec6_pcie->regmap))
> +		return PTR_ERR(artpec6_pcie->regmap);
>  
>  	ret = artpec6_add_pcie_port(pp, pdev);
>  	if (ret < 0)
> -		goto fail;
> +		return ret;
>  
>  	platform_set_drvdata(pdev, artpec6_pcie);
>  	return 0;
> -
> -fail:
> -	return ret;
>  }
>  
>  static const struct of_device_id artpec6_pcie_of_match[] = {