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

[Lorenzo Pieralisi]

On Wed, Aug 29, 2018 at 01:34:40PM -0500, Rob Herring wrote:
> 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(-)

Hi Michal,

are you OK with these changes ?

Thanks,
Lorenzo

> 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)) {
> diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
> index a939e8d31735..77052a0712d0 100644
> --- a/drivers/pci/controller/pcie-mobiveil.c
> +++ b/drivers/pci/controller/pcie-mobiveil.c
> @@ -301,13 +301,6 @@ static int mobiveil_pcie_parse_dt(struct mobiveil_pcie *pcie)
>  	struct platform_device *pdev = pcie->pdev;
>  	struct device_node *node = dev->of_node;
>  	struct resource *res;
> -	const char *type;
> -
> -	type = of_get_property(node, "device_type", NULL);
> -	if (!type || strcmp(type, "pci")) {
> -		dev_err(dev, "invalid \"device_type\" %s\n", type);
> -		return -EINVAL;
> -	}
>  
>  	/* map config resource */
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c
> index fb32840ce8e6..81538d77f790 100644
> --- a/drivers/pci/controller/pcie-xilinx-nwl.c
> +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
> @@ -777,16 +777,7 @@ static int nwl_pcie_parse_dt(struct nwl_pcie *pcie,
>  			     struct platform_device *pdev)
>  {
>  	struct device *dev = pcie->dev;
> -	struct device_node *node = dev->of_node;
>  	struct resource *res;
> -	const char *type;
> -
> -	/* Check for device type */
> -	type = of_get_property(node, "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, "breg");
>  	pcie->breg_base = devm_ioremap_resource(dev, res);
> diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
> index 7b1389d8e2a5..9bd1a35cd5d8 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -574,15 +574,8 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port)
>  	struct device *dev = port->dev;
>  	struct device_node *node = dev->of_node;
>  	struct resource regs;
> -	const char *type;
>  	int err;
>  
> -	type = of_get_property(node, "device_type", NULL);
> -	if (!type || strcmp(type, "pci")) {
> -		dev_err(dev, "invalid \"device_type\" %s\n", type);
> -		return -EINVAL;
> -	}
> -
>  	err = of_address_to_resource(node, 0, &regs);
>  	if (err) {
>  		dev_err(dev, "missing \"reg\" property\n");
> -- 
> 2.17.1
>