linux-kernel - [PATCH v2 1/3] mtd: nand: atmel: Defer probe if SRAM is missing

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Message-Id: <20251120-at91-probe-v2-1-8c8592f02e8e@kernel.org>
Date: Thu, 20 Nov 2025 15:37:50 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 Russell King <linux@...linux.org.uk>
Cc: linux-mtd@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] mtd: nand: atmel: Defer probe if SRAM is missing

The Atmel NAND controller driver depends on an SRAM pool and has an
implicit assumption that the SRAM pool has already been created.
Changing the initcall ordering can break this. Unfortunately, fw_devlink
can't save us here as there's not a standard property to track the
dependency. So it's up to deferring probe to save us.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/mtd/nand/raw/atmel/nand-controller.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index 83ba4ebd02d4..e60998eb754b 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -2306,7 +2306,7 @@ atmel_hsmc_nand_controller_init(struct atmel_hsmc_nand_controller *nc)
 					 "atmel,nfc-sram", 0);
 	if (!nc->sram.pool) {
 		dev_err(nc->base.dev, "Missing SRAM\n");
-		return -ENOMEM;
+		return -EPROBE_DEFER;
 	}
 
 	nc->sram.virt = (void __iomem *)gen_pool_dma_alloc(nc->sram.pool,

-- 
2.51.0