linux-kernel - RE: [PATCH] PCI: remove unnecessary check of device

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Message-ID: <BN6PR07MB3491262D6674CC2F9734FB3CD8080@BN6PR07MB3491.namprd07.prod.outlook.com>
Date:   Thu, 30 Aug 2018 14:33:45 +0000
From:   Alan Douglas <adouglas@...ence.com>
To:     Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>,
        Michal Simek <michal.simek@...inx.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] PCI: remove unnecessary check of device_type == pci

Hi,

On 29 August 2018 19:35, Rob Herring wrote:
> To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: linux-kernel@...r.kernel.org; Will Deacon <will.deacon@....com>; Bjorn Helgaas <bhelgaas@...gle.com>; Alan Douglas
> <adouglas@...ence.com>; Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>; Michal Simek <michal.simek@...inx.com>; linux-
> pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Subject: [PATCH] PCI: remove unnecessary check of device_type == pci
> 
> EXTERNAL MAIL
> 
> 
> PCI host drivers have already matched on compatible strings, so checking
> device_type is redundant. Also, device_type is considered deprecated for
> FDT though we've still been requiring it for PCI hosts as it is useful
> for finding PCI buses.
> 
> Cc: Will Deacon <will.deacon@....com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Alan Douglas <adouglas@...ence.com>
> Cc: Subrahmanya Lingappa <l.subrahmanya@...iveil.co.in>
> Cc: Michal Simek <michal.simek@...inx.com>
> Cc: linux-pci@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/pci/controller/pci-host-common.c   | 8 --------
>  drivers/pci/controller/pcie-cadence-host.c | 7 -------
>  drivers/pci/controller/pcie-mobiveil.c     | 7 -------
>  drivers/pci/controller/pcie-xilinx-nwl.c   | 9 ---------
>  drivers/pci/controller/pcie-xilinx.c       | 7 -------
>  5 files changed, 38 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
> index d8f10451f273..c742881b5061 100644
> --- a/drivers/pci/controller/pci-host-common.c
> +++ b/drivers/pci/controller/pci-host-common.c
> @@ -58,9 +58,7 @@ static struct pci_config_window *gen_pci_init(struct device *dev,
>  int pci_host_common_probe(struct platform_device *pdev,
>  			  struct pci_ecam_ops *ops)
>  {
> -	const char *type;
>  	struct device *dev = &pdev->dev;
> -	struct device_node *np = dev->of_node;
>  	struct pci_host_bridge *bridge;
>  	struct pci_config_window *cfg;
>  	struct list_head resources;
> @@ -70,12 +68,6 @@ int pci_host_common_probe(struct platform_device *pdev,
>  	if (!bridge)
>  		return -ENOMEM;
> 
> -	type = of_get_property(np, "device_type", NULL);
> -	if (!type || strcmp(type, "pci")) {
> -		dev_err(dev, "invalid \"device_type\" %s\n", type);
> -		return -EINVAL;
> -	}
> -
>  	of_pci_check_probe_only();
> 
>  	/* Parse and map our Configuration Space windows */
> diff --git a/drivers/pci/controller/pcie-cadence-host.c b/drivers/pci/controller/pcie-cadence-host.c
> index ec394f6a19c8..97e251090b4f 100644
> --- a/drivers/pci/controller/pcie-cadence-host.c
> +++ b/drivers/pci/controller/pcie-cadence-host.c
> @@ -235,7 +235,6 @@ static int cdns_pcie_host_init(struct device *dev,
> 
>  static int cdns_pcie_host_probe(struct platform_device *pdev)
>  {
> -	const char *type;
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
>  	struct pci_host_bridge *bridge;
> @@ -268,12 +267,6 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
>  	rc->device_id = 0xffff;
>  	of_property_read_u16(np, "device-id", &rc->device_id);
> 
> -	type = of_get_property(np, "device_type", NULL);
> -	if (!type || strcmp(type, "pci")) {
> -		dev_err(dev, "invalid \"device_type\" %s\n", type);
> -		return -EINVAL;
> -	}
> -
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg");
>  	pcie->reg_base = devm_ioremap_resource(dev, res);
>  	if (IS_ERR(pcie->reg_base)) {
With regards to drivers/pci/controller/pcie-cadence-host.c
Acked-by: Alan Douglas <adouglas@...ence.com>