RE: [PATCH] PCI: remove unnecessary check of device_type == pci

[Alan Douglas]

Hi,

On 29 August 2018 19:35, Rob Herring wrote:
> To: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; Will Deacon <will.deacon@xxxxxxx>; Bjorn Helgaas <bhelgaas@xxxxxxxxxx>; Alan Douglas
> <adouglas@xxxxxxxxxxx>; Subrahmanya Lingappa <l.subrahmanya@xxxxxxxxxxxxxx>; Michal Simek <michal.simek@xxxxxxxxxx>; linux-
> pci@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> 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@xxxxxxx>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Alan Douglas <adouglas@xxxxxxxxxxx>
> Cc: Subrahmanya Lingappa <l.subrahmanya@xxxxxxxxxxxxxx>
> Cc: Michal Simek <michal.simek@xxxxxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> ---
>  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@xxxxxxxxxxx>