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PCI: iproc: Implement MSI controller node detection with of_msi_xlate() 

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@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20251021124103.198419-5-lpieralisi@kernel.org
This commit is contained in:
Lorenzo Pieralisi 2025-10-21 14:41:02 +02:00 committed by Thomas Gleixner
parent ebb922c920
commit 4f32612f6a
1 changed files with 5 additions and 17 deletions
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22
drivers/pci/controller/pcie-iproc.c
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@ -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