linux-kernel - Re: [PATCH v4 4/5] PCI: iproc: Implement MSI controller node detection with of_msi

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Message-ID: <20251021154529.GA1191613@bhelgaas>
Date: Tue, 21 Oct 2025 10:45:29 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
	Frank Li <Frank.Li@....com>, Scott Branden <sbranden@...adcom.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh@...nel.org>,
	Ray Jui <rjui@...adcom.com>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Sascha Bischoff <sascha.bischoff@....com>,
	Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v4 4/5] PCI: iproc: Implement MSI controller node
 detection with of_msi_xlate()

On Tue, Oct 21, 2025 at 02:41:02PM +0200, Lorenzo Pieralisi wrote:
> The functionality implemented in the iproc driver in order to detect an
> OF MSI controller node is now fully implemented in of_msi_xlate().
> 
> Replace the current msi-map/msi-parent parsing code with of_msi_xlate().
> 
> Since of_msi_xlate() is also a deviceID mapping API, pass in a fictitious
> 0 as deviceID - the driver only requires detecting the OF MSI controller
> node not the deviceID mapping per-se (of_msi_xlate() return value is
> ignored for the same reason).
> 
> Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Reviewed-by: Frank Li <Frank.Li@....com>
> Cc: Scott Branden <sbranden@...adcom.com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: Rob Herring <robh@...nel.org>
> Cc: Ray Jui <rjui@...adcom.com>
> Cc: Manivannan Sadhasivam <mani@...nel.org>
> Cc: "Krzysztof Wilczyński" <kwilczynski@...nel.org>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

I assume this is material for Rob or Thomas?

> ---
>  drivers/pci/controller/pcie-iproc.c | 22 +++++-----------------
>  1 file changed, 5 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index 22134e95574b..ccf71993ea35 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -17,6 +17,7 @@
>  #include <linux/irqchip/arm-gic-v3.h>
>  #include <linux/platform_device.h>
>  #include <linux/of_address.h>
> +#include <linux/of_irq.h>
>  #include <linux/of_pci.h>
>  #include <linux/of_platform.h>
>  #include <linux/phy/phy.h>
> @@ -1337,29 +1338,16 @@ static int iproc_pcie_msi_steer(struct iproc_pcie *pcie,
>  
>  static int iproc_pcie_msi_enable(struct iproc_pcie *pcie)
>  {
> -	struct device_node *msi_node;
> +	struct device_node *msi_node = NULL;
>  	int ret;
>  
>  	/*
>  	 * Either the "msi-parent" or the "msi-map" phandle needs to exist
>  	 * for us to obtain the MSI node.
>  	 */
> -
> -	msi_node = of_parse_phandle(pcie->dev->of_node, "msi-parent", 0);
> -	if (!msi_node) {
> -		const __be32 *msi_map = NULL;
> -		int len;
> -		u32 phandle;
> -
> -		msi_map = of_get_property(pcie->dev->of_node, "msi-map", &len);
> -		if (!msi_map)
> -			return -ENODEV;
> -
> -		phandle = be32_to_cpup(msi_map + 1);
> -		msi_node = of_find_node_by_phandle(phandle);
> -		if (!msi_node)
> -			return -ENODEV;
> -	}
> +	of_msi_xlate(pcie->dev, &msi_node, 0);
> +	if (!msi_node)
> +		return -ENODEV;
>  
>  	/*
>  	 * Certain revisions of the iProc PCIe controller require additional
> -- 
> 2.50.1
>