[PATCHv2 3/4] ARM: mm: add support for HW coherent systems in PL310
From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2014-05-14 14:34:48
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linux-devicetree
On Tue, May 13, 2014 at 11:10:38AM +0100, Thomas Petazzoni wrote:
quoted hunk
--- a/Documentation/devicetree/bindings/arm/l2cc.txt +++ b/Documentation/devicetree/bindings/arm/l2cc.txt@@ -8,6 +8,8 @@ Required properties: - compatible : should be one of: "arm,pl310-cache" + "arm,pl310-coherent-cache", used for I/O coherent platforms using + the PL310 cache "arm,l220-cache" "arm,l210-cache" "bcm,bcm11351-a2-pl310-cache": DEPRECATED by "brcm,bcm11351-a2-pl310-cache"
The binding name kind of implies that we have a transparent PL310 cache (at least to me), which is not the case. I would rather have a specific dma-coherent property or something similar since it's not another type of PL310 but rather a different SoC topology. But I recall you mentioned that you can't make this decision at the DT level since you don't know before whether the SoC is I/O coherent or not. -- Catalin