linux-kernel - Re: [PATCH 2/2] PCI: cadence: Do not error if "cdns,max-outbound-regions" is not found

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Date:   Mon, 9 Nov 2020 15:42:59 -0600
From:   Rob Herring <robh@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] PCI: cadence: Do not error if
 "cdns,max-outbound-regions" is not found

On Fri, Nov 06, 2020 at 08:41:07PM +0530, Kishon Vijay Abraham I wrote:
> Now that "cdns,max-outbound-regions" is made an optional property, do
> not error out if "cdns,max-outbound-regions" device tree property is
> not found.
> 
> Link: http://lore.kernel.org/r/20201105165331.GA55814@bogus
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/controller/cadence/pcie-cadence-ep.c | 9 +++------
>  drivers/pci/controller/cadence/pcie-cadence.h    | 1 +
>  2 files changed, 4 insertions(+), 6 deletions(-)

Reviewed-by: Rob Herring <robh@...nel.org>

> 
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c
> index 254a3e1eff50..9a4195af958e 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c
> @@ -531,12 +531,9 @@ int cdns_pcie_ep_setup(struct cdns_pcie_ep *ep)
>  	}
>  	pcie->mem_res = res;
>  
> -	ret = of_property_read_u32(np, "cdns,max-outbound-regions",
> -				   &ep->max_regions);
> -	if (ret < 0) {
> -		dev_err(dev, "missing \"cdns,max-outbound-regions\"\n");
> -		return ret;
> -	}
> +	ep->max_regions = CDNS_PCIE_MAX_OB;
> +	of_property_read_u32(np, "cdns,max-outbound-regions", &ep->max_regions);
> +
>  	ep->ob_addr = devm_kcalloc(dev,
>  				   ep->max_regions, sizeof(*ep->ob_addr),
>  				   GFP_KERNEL);
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> index feed1e3038f4..30eba6cafe2c 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.h
> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> @@ -197,6 +197,7 @@ enum cdns_pcie_rp_bar {
>  };
>  
>  #define CDNS_PCIE_RP_MAX_IB	0x3
> +#define CDNS_PCIE_MAX_OB	32
>  
>  struct cdns_pcie_rp_ib_bar {
>  	u64 size;
> -- 
> 2.17.1
>