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Message-ID: <20180913145130.GA5756@e107981-ln.cambridge.arm.com>
Date: Thu, 13 Sep 2018 15:51:30 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Rob Herring <robh@...nel.org>
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: Re: [PATCH] PCI: remove unnecessary check of device_type == pci
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.
Hi Rob,
I have no problem with the patch per-se, I can't parse though the second
paragraph, in particular what you mean by "useful for finding PCI
buses".
What about the corresponding dts files ? I suspect we had better leave
them alone lest we can trigger regressions with new dts and older
kernels.
Thanks,
Lorenzo
> 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)) {
> 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, ®s);
> if (err) {
> dev_err(dev, "missing \"reg\" property\n");
> --
> 2.17.1
>
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