linux-kernel - Re: [PATCH] PCI: Use of_property_present() for testing DT property presence

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Date:   Tue, 18 Apr 2023 11:27:19 -0500
From:   Rob Herring <robh@...nel.org>
To:     Thierry Reding <thierry.reding@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-tegra@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] PCI: Use of_property_present() for testing DT property
 presence

On Fri, Mar 10, 2023 at 08:47:19AM -0600, Rob Herring wrote:
> It is preferred to use typed property access functions (i.e.
> of_property_read_<type> functions) rather than low-level
> of_get_property/of_find_property functions for reading properties. As
> part of this, convert of_get_property/of_find_property calls to the
> recently added of_property_present() helper when we just want to test
> for presence of a property and nothing more.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  drivers/pci/controller/pci-tegra.c     | 4 ++--
>  drivers/pci/controller/pcie-mediatek.c | 2 +-
>  drivers/pci/hotplug/rpaphp_core.c      | 4 ++--
>  drivers/pci/of.c                       | 2 +-
>  4 files changed, 6 insertions(+), 6 deletions(-)

Ping!

> 
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 74c109f14ff0..79630885b9c8 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -1375,7 +1375,7 @@ static int tegra_pcie_phys_get(struct tegra_pcie *pcie)
>  	struct tegra_pcie_port *port;
>  	int err;
>  
> -	if (!soc->has_gen2 || of_find_property(np, "phys", NULL) != NULL)
> +	if (!soc->has_gen2 || of_property_present(np, "phys"))
>  		return tegra_pcie_phys_get_legacy(pcie);
>  
>  	list_for_each_entry(port, &pcie->ports, list) {
> @@ -1944,7 +1944,7 @@ static bool of_regulator_bulk_available(struct device_node *np,
>  	for (i = 0; i < num_supplies; i++) {
>  		snprintf(property, 32, "%s-supply", supplies[i].supply);
>  
> -		if (of_find_property(np, property, NULL) == NULL)
> +		if (!of_property_present(np, property))
>  			return false;
>  	}
>  
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index ae5ad05ddc1d..31de7a29192c 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -643,7 +643,7 @@ static int mtk_pcie_setup_irq(struct mtk_pcie_port *port,
>  		return err;
>  	}
>  
> -	if (of_find_property(dev->of_node, "interrupt-names", NULL))
> +	if (of_property_present(dev->of_node, "interrupt-names"))
>  		port->irq = platform_get_irq_byname(pdev, "pcie_irq");
>  	else
>  		port->irq = platform_get_irq(pdev, port->slot);
> diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
> index 491986197c47..2316de0fd198 100644
> --- a/drivers/pci/hotplug/rpaphp_core.c
> +++ b/drivers/pci/hotplug/rpaphp_core.c
> @@ -278,7 +278,7 @@ int rpaphp_check_drc_props(struct device_node *dn, char *drc_name,
>  		return -EINVAL;
>  	}
>  
> -	if (of_find_property(dn->parent, "ibm,drc-info", NULL))
> +	if (of_property_present(dn->parent, "ibm,drc-info"))
>  		return rpaphp_check_drc_props_v2(dn, drc_name, drc_type,
>  						be32_to_cpu(*my_index));
>  	else
> @@ -440,7 +440,7 @@ int rpaphp_add_slot(struct device_node *dn)
>  	if (!of_node_name_eq(dn, "pci"))
>  		return 0;
>  
> -	if (of_find_property(dn, "ibm,drc-info", NULL))
> +	if (of_property_present(dn, "ibm,drc-info"))
>  		return rpaphp_drc_info_add_slot(dn);
>  	else
>  		return rpaphp_drc_add_slot(dn);
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index 196834ed44fe..e085f2eca372 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -447,7 +447,7 @@ static int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *
>  		return -ENODEV;
>  
>  	/* Local interrupt-map in the device node? Use it! */
> -	if (of_get_property(dn, "interrupt-map", NULL)) {
> +	if (of_property_present(dn, "interrupt-map")) {
>  		pin = pci_swizzle_interrupt_pin(pdev, pin);
>  		ppnode = dn;
>  	}
> -- 
> 2.39.2
>