Re: [PATCH v3] EDAC/altera: use ECC manager compatible to select A10/S10 IRQ layout

[Dinh Nguyen <dinguyen@kernel.org>]

On 6/16/26 19:07, Rounak Das wrote:
> The SDMMC ECC IRQ layout selection uses CONFIG_64BIT to distinguish
> between Arria10 and Stratix10 paths. This is architecture-based,
> while the interrupt layout is a hardware property described by DT
> compatible strings.
> 
> Detect the SoC once at probe via the altr,socfpga-s10-ecc-manager
> compatible on the ECC manager node, store it under the struct
> altr_arria10_edac, and use it in altr_portb_setup() and
> altr_edac_a10_device_add() in place of CONFIG_64BIT.
> 
> Selecting on the manager compatible keeps the decision SoC-wide and
> correct for every ECC child device (OCRAM, USB, EMAC, SD/MMC),
> and avoids repeated compatible lookups. Stratix10 and
> Agilex both declare altr,socfpga-s10-ecc-manager and Arria10 does not,
> so behaviour is unchanged on all three SoCs.
> 
> Signed-off-by: Rounak Das <rounakdas2025@gmail.com>
> ---
> v3:
>   - Use compatible string altr,socfpga-s10-ecc-manager instead of
>     sdmmc-ecc (Dinh).
>   - Set it once into struct altr_arria10_edac::is_s10 to
>     avoid repeated of_device_is_compatible() calls (Dinh).
>   - Fix the checkpatch open-parenthesis alignment.
> 
> v2: https://lore.kernel.org/linux-edac/20260616081709.48774-1-rounakdas2025@gmail.com/
>   - Use legal name in Signed-off-by (Borislav).
> 
>   drivers/edac/altera_edac.c | 106 +++++++++++++++++++------------------
>   drivers/edac/altera_edac.h |   1 +
>   2 files changed, 55 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
> index 4edd2088c2db6..c728cd474abdf 100644
> --- a/drivers/edac/altera_edac.c
> +++ b/drivers/edac/altera_edac.c
> @@ -1507,6 +1507,7 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
>   	int edac_idx, rc;
>   	struct device_node *np;
>   	const struct edac_device_prv_data *prv = &a10_sdmmceccb_data;
> +	bool is_s10 = device->edac->is_s10;
>   
>   	rc = altr_check_ecc_deps(device);
>   	if (rc)
> @@ -1548,15 +1549,14 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
>   
>   	/*
>   	 * Update the PortB IRQs - A10 has 4, S10 has 2, Index accordingly
> -	 *
> -	 * FIXME: Instead of ifdefs with different architectures the driver
> -	 *        should properly use compatibles.
>   	 */
> -#ifdef CONFIG_64BIT
> -	altdev->sb_irq = irq_of_parse_and_map(np, 1);
> -#else
> -	altdev->sb_irq = irq_of_parse_and_map(np, 2);
> -#endif
> +
> +	/* Using compatibles to determine the IRQ Index */
> +	if (is_s10)
> +		altdev->sb_irq = irq_of_parse_and_map(np, 1);
> +	else
> +		altdev->sb_irq = irq_of_parse_and_map(np, 2);
> +
>   	if (!altdev->sb_irq) {
>   		edac_printk(KERN_ERR, EDAC_DEVICE, "Error PortB SBIRQ alloc\n");
>   		rc = -ENODEV;
> @@ -1570,29 +1570,28 @@ static int altr_portb_setup(struct altr_edac_device_dev *device)
>   		goto err_release_group_1;
>   	}
>   
> -#ifdef CONFIG_64BIT
> -	/* Use IRQ to determine SError origin instead of assigning IRQ */
> -	rc = of_property_read_u32_index(np, "interrupts", 1, &altdev->db_irq);
> -	if (rc) {
> -		edac_printk(KERN_ERR, EDAC_DEVICE,
> -			    "Error PortB DBIRQ alloc\n");
> -		goto err_release_group_1;
> -	}
> -#else
> -	altdev->db_irq = irq_of_parse_and_map(np, 3);
> -	if (!altdev->db_irq) {
> -		edac_printk(KERN_ERR, EDAC_DEVICE, "Error PortB DBIRQ alloc\n");
> -		rc = -ENODEV;
> -		goto err_release_group_1;
> -	}
> -	rc = devm_request_irq(&altdev->ddev, altdev->db_irq,
> -			      prv->ecc_irq_handler, IRQF_TRIGGER_HIGH,
> -			      ecc_name, altdev);
> -	if (rc) {
> -		edac_printk(KERN_ERR, EDAC_DEVICE, "PortB DBERR IRQ error\n");
> -		goto err_release_group_1;
> +	if (is_s10) {
> +		/* Use IRQ to determine SError origin instead of assigning IRQ */
> +		rc = of_property_read_u32_index(np, "interrupts", 1, &altdev->db_irq);
> +		if (rc) {
> +			edac_printk(KERN_ERR, EDAC_DEVICE, "Error PortB DBIRQ alloc\n");
> +			goto err_release_group_1;
> +		}
> +	} else {
> +		altdev->db_irq = irq_of_parse_and_map(np, 3);
> +		if (!altdev->db_irq) {
> +			edac_printk(KERN_ERR, EDAC_DEVICE, "Error PortB DBIRQ alloc\n");
> +			rc = -ENODEV;
> +			goto err_release_group_1;
> +		}
> +		rc = devm_request_irq(&altdev->ddev, altdev->db_irq,
> +				      prv->ecc_irq_handler, IRQF_TRIGGER_HIGH,
> +				      ecc_name, altdev);
> +		if (rc) {
> +			edac_printk(KERN_ERR, EDAC_DEVICE, "PortB DBERR IRQ error\n");
> +			goto err_release_group_1;
> +		}
>   	}
> -#endif
>   
>   	rc = edac_device_add_device(dci);
>   	if (rc) {
> @@ -1974,29 +1973,29 @@ static int altr_edac_a10_device_add(struct altr_arria10_edac *edac,
>   		goto err_release_group1;
>   	}
>   
> -#ifdef CONFIG_64BIT
> -	/* Use IRQ to determine SError origin instead of assigning IRQ */
> -	rc = of_property_read_u32_index(np, "interrupts", 0, &altdev->db_irq);
> -	if (rc) {
> -		edac_printk(KERN_ERR, EDAC_DEVICE,
> -			    "Unable to parse DB IRQ index\n");
> -		goto err_release_group1;
> -	}
> -#else
> -	altdev->db_irq = irq_of_parse_and_map(np, 1);
> -	if (!altdev->db_irq) {
> -		edac_printk(KERN_ERR, EDAC_DEVICE, "Error allocating DBIRQ\n");
> -		rc = -ENODEV;
> -		goto err_release_group1;
> -	}
> -	rc = devm_request_irq(edac->dev, altdev->db_irq, prv->ecc_irq_handler,
> -			      IRQF_TRIGGER_HIGH,
> -			      ecc_name, altdev);
> -	if (rc) {
> -		edac_printk(KERN_ERR, EDAC_DEVICE, "No DBERR IRQ resource\n");
> -		goto err_release_group1;
> +	if (edac->is_s10) {
> +		/* Use IRQ to determine SError origin instead of assigning IRQ */
> +		rc = of_property_read_u32_index(np, "interrupts", 0, &altdev->db_irq);
> +		if (rc) {
> +			edac_printk(KERN_ERR, EDAC_DEVICE,
> +				    "Unable to parse DB IRQ index\n");
> +			goto err_release_group1;
> +		}
> +	} else {
> +		altdev->db_irq = irq_of_parse_and_map(np, 1);
> +		if (!altdev->db_irq) {
> +			edac_printk(KERN_ERR, EDAC_DEVICE, "Error allocating DBIRQ\n");
> +			rc = -ENODEV;
> +			goto err_release_group1;
> +		}
> +		rc = devm_request_irq(edac->dev, altdev->db_irq, prv->ecc_irq_handler,
> +				      IRQF_TRIGGER_HIGH,
> +				      ecc_name, altdev);
> +		if (rc) {
> +			edac_printk(KERN_ERR, EDAC_DEVICE, "No DBERR IRQ resource\n");
> +			goto err_release_group1;
> +		}
>   	}
> -#endif
>   
>   	rc = edac_device_add_device(dci);
>   	if (rc) {
> @@ -2122,6 +2121,9 @@ static int altr_edac_a10_probe(struct platform_device *pdev)
>   	platform_set_drvdata(pdev, edac);
>   	INIT_LIST_HEAD(&edac->a10_ecc_devices);
>   
> +	edac->is_s10 = of_device_is_compatible(pdev->dev.of_node,
> +					       "altr,socfpga-s10-ecc-manager");
> +


I tested this version on both 32-bit and 64-bit platforms and there were 
no regression. But I'd like to see if we can avoid using 
of_device_is_compatible in runtime code and see if we can just bind to 
the "altr,socfpga-s10-ecc-manager" if possible?

Thanks,
Dinh