net: stmmac: platform: read channels irq

Read IRQ resources for all rx/tx channels, to allow Multi-IRQ mode
for platform glue drivers.

Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Signed-off-by: Jan Petrous (OSS) <jan.petrous@oss.nxp.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260313-dwmac_multi_irq-v12-1-b5c9d0aa13d6@oss.nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 3b514a702612d537d4a6672161f46916c35b117c..59aac0afc609a2b49811c20b6c964f43ed1b6ed3 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -695,9 +695,47 @@ struct clk *stmmac_pltfr_find_clk(struct plat_stmmacenet_data *plat_dat,
 }
 EXPORT_SYMBOL_GPL(stmmac_pltfr_find_clk);
 
+/**
+ * stmmac_pltfr_get_irq_array - Read per-channel IRQs from platform device
+ * @pdev: platform device
+ * @fmt: IRQ name format string (e.g., "tx-queue-%d")
+ * @irqs: array to store IRQ numbers
+ * @num: maximum number of IRQs to read
+ *
+ * Return: 0 on success, -EPROBE_DEFER if IRQ is deferred, -EINVAL on error.
+ * Missing IRQs are set to 0 and iteration stops at first missing IRQ.
+ */
+static int stmmac_pltfr_get_irq_array(struct platform_device *pdev,
+                                     const char *fmt, int *irqs, size_t num)
+{
+       char name[16];
+       int i;
+
+       for (i = 0; i < num; i++) {
+               if (snprintf(name, sizeof(name), fmt, i) >= sizeof(name))
+                       return -EINVAL;
+
+               irqs[i] = platform_get_irq_byname_optional(pdev, name);
+               if (irqs[i] == -EPROBE_DEFER)
+                       return -EPROBE_DEFER;
+
+               if (irqs[i] <= 0) {
+                       dev_dbg(&pdev->dev, "IRQ %s not found\n", name);
+
+                       /* Stop silently on first unset irq */
+                       irqs[i] = 0;
+                       break;
+               }
+       }
+
+       return 0;
+}
+
 int stmmac_get_platform_resources(struct platform_device *pdev,
                                  struct stmmac_resources *stmmac_res)
 {
+       int ret;
+
        memset(stmmac_res, 0, sizeof(*stmmac_res));
 
        /* Get IRQ information early to have an ability to ask for deferred
@@ -733,7 +771,24 @@ int stmmac_get_platform_resources(struct platform_device *pdev,
 
        stmmac_res->addr = devm_platform_ioremap_resource(pdev, 0);
 
-       return PTR_ERR_OR_ZERO(stmmac_res->addr);
+       if (IS_ERR(stmmac_res->addr))
+               return PTR_ERR(stmmac_res->addr);
+
+       /* TX channels irq */
+       ret = stmmac_pltfr_get_irq_array(pdev, "tx-queue-%d",
+                                        stmmac_res->tx_irq,
+                                        MTL_MAX_TX_QUEUES);
+       if (ret)
+               return ret;
+
+       /* RX channels irq */
+       ret = stmmac_pltfr_get_irq_array(pdev, "rx-queue-%d",
+                                        stmmac_res->rx_irq,
+                                        MTL_MAX_RX_QUEUES);
+       if (ret)
+               return ret;
+
+       return 0;
 }
 EXPORT_SYMBOL_GPL(stmmac_get_platform_resources);