linux-kernel - [PATCH] powerpc: 44x: Use for_each_of

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Message-ID: <20241106212640.341677-1-robh@kernel.org>
Date: Wed,  6 Nov 2024 15:26:39 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: 44x: Use for_each_of_range() iterator

Simplify the ppc44x PCI dma-ranges parsing to use the for_each_of_range()
iterator.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 arch/powerpc/platforms/44x/pci.c | 23 +++++++++--------------
 1 file changed, 9 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/platforms/44x/pci.c b/arch/powerpc/platforms/44x/pci.c
index db6d33ca753f..364aeb86ab64 100644
--- a/arch/powerpc/platforms/44x/pci.c
+++ b/arch/powerpc/platforms/44x/pci.c
@@ -94,10 +94,8 @@ static int __init ppc4xx_parse_dma_ranges(struct pci_controller *hose,
 					  struct resource *res)
 {
 	u64 size;
-	const u32 *ranges;
-	int rlen;
-	int pna = of_n_addr_cells(hose->dn);
-	int np = pna + 5;
+	struct of_range_parser parser;
+	struct of_range range;
 
 	/* Default */
 	res->start = 0;
@@ -105,18 +103,15 @@ static int __init ppc4xx_parse_dma_ranges(struct pci_controller *hose,
 	res->end = size - 1;
 	res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 
-	/* Get dma-ranges property */
-	ranges = of_get_property(hose->dn, "dma-ranges", &rlen);
-	if (ranges == NULL)
+	if (of_pci_dma_range_parser_init(&parser, hose->dn))
 		goto out;
 
-	/* Walk it */
-	while ((rlen -= np * 4) >= 0) {
-		u32 pci_space = ranges[0];
-		u64 pci_addr = of_read_number(ranges + 1, 2);
-		u64 cpu_addr = of_translate_dma_address(hose->dn, ranges + 3);
-		size = of_read_number(ranges + pna + 3, 2);
-		ranges += np;
+	for_each_of_range(&parser, &range) {
+		u32 pci_space = range.flags;
+		u64 pci_addr = range.bus_addr;
+		u64 cpu_addr = range.cpu_addr;
+		size = range.size;
+
 		if (cpu_addr == OF_BAD_ADDR || size == 0)
 			continue;
 
-- 
2.45.2