linux-kernel - [PATCH] powerpc/prom_init: Fixup missing powermac #size-cells on i2s nodes

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Message-ID: <20250318192256.3534046-1-robh@kernel.org>
Date: Tue, 18 Mar 2025 14:22:55 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>
Cc: Christoph Biedl <linux-kernel.bfrz@...chmal.in-ulm.de>,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/prom_init: Fixup missing powermac #size-cells on i2s nodes

On some powermacs `i2s` nodes are missing `#size-cells` properties,
which is deprecated and now triggers a warning at boot since commit
045b14ca5c36 ("of: WARN on deprecated #address-cells/#size-cells
handling").

For example:

  Missing '#size-cells' in /pci@...00000/mac-io@...i2s@...00
  WARNING: CPU: 0 PID: 462 at drivers/of/base.c:134 of_bus_n_size_cells+0xb0/0x120
  Hardware name: PowerMac3,4 7400 0xc0209 PowerMac
  ...
  Call Trace:
    of_bus_n_size_cells+0xb0/0x120 (unreliable)
    of_bus_default_count_cells+0x40/0x60
    __of_get_address+0x158/0x294
    __of_address_to_resource+0x48/0x258
    i2sbus_probe+0x564/0x85c [snd_aoa_i2sbus]
    macio_device_probe+0x60/0x108
    really_probe+0xd8/0x344
    __driver_probe_device+0x90/0x1f0
    driver_probe_device+0x40/0xf4
    ...

As there's already a fixup for the same issue on `escc` nodes, add
`i2s` device_type to the existing fixup.

Reported-by: Christoph Biedl <linux-kernel.bfrz@...chmal.in-ulm.de>
Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 arch/powerpc/kernel/prom_init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
index 57082fac4668..69018a2afc41 100644
--- a/arch/powerpc/kernel/prom_init.c
+++ b/arch/powerpc/kernel/prom_init.c
@@ -2889,11 +2889,11 @@ static void __init fixup_device_tree_pmac(void)
 	char type[8];
 	phandle node;
 
-	// Some pmacs are missing #size-cells on escc nodes
+	// Some pmacs are missing #size-cells on escc and i2s nodes
 	for (node = 0; prom_next_node(&node); ) {
 		type[0] = '\0';
 		prom_getprop(node, "device_type", type, sizeof(type));
-		if (prom_strcmp(type, "escc"))
+		if (prom_strcmp(type, "escc") && prom_strcmp(type, "i2s"))
 			continue;
 
 		if (prom_getproplen(node, "#size-cells") != PROM_ERROR)
-- 
2.47.2