Commit a31bbe5c authored by Jan Petrous (OSS)'s avatar Jan Petrous (OSS) Committed by Jakub Kicinski
Browse files

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: default avatarMatthias Brugger <mbrugger@suse.com>
Signed-off-by: default avatarJan Petrous (OSS) <jan.petrous@oss.nxp.com>
Reviewed-by: default avatarRussell 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: default avatarJakub Kicinski <kuba@kernel.org>
parent cc6421ac

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

+56 −1
Original line number Diff line number Diff line
@@ -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);