linux-kernel - Re: [PATCH v3 2/4] of: move of_dma_configure() to device,c to help re-use

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Date:	Fri, 09 Jan 2015 01:05:11 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	Rob Herring <robherring2@...il.com>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH v3 2/4] of: move of_dma_configure() to device,c to help re-use

On Thursday 08 January 2015 18:44:31 Murali Karicheri wrote:
> The grep of dma-ranges for arch/arm shows the size used is mask + 1 as
> 
> ./boot/dts/keystone.dtsi:               dma-ranges = <0x80000000 0x8 0x00000000 
> 0x80000000>;
> ./boot/dts/keystone.dtsi:                       dma-ranges;
> ./boot/dts/keystone.dtsi:                       dma-ranges;
> ./boot/dts/r8a7790.dtsi:                dma-ranges = <0x42000000 0 0x40000000 0 
> 0x40000000 0 0x80000000
> ./boot/dts/integratorap.dts:    dma-ranges = <0x80000000 0x0 0x80000000>;
> ./boot/dts/r8a7791.dtsi:                dma-ranges = <0x42000000 0 0x40000000 0 
> 0x40000000 0 0x80000000
> ./boot/dts/.k2hk-evm.dtb.dts.tmp:  dma-ranges = <0x80000000 0x8 
> 0x00000000 0x80000000>;
> ./boot/dts/.k2hk-evm.dtb.dts.tmp:   dma-ranges;
> ./boot/dts/.k2l-evm.dtb.dts.tmp:  dma-ranges = <0x80000000 0x8 
> 0x00000000 0x80000000>;
> ./boot/dts/.k2l-evm.dtb.dts.tmp:   dma-ranges;
> ./boot/dts/.k2e-evm.dtb.dts.tmp:  dma-ranges = <0x80000000 0x8 
> 0x00000000 0x80000000>;
> ./boot/dts/.k2e-evm.dtb.dts.tmp:   dma-ranges;
> ./boot/dts/.k2e-evm.dtb.dts.tmp:   dma-ranges;
> ./boot/dts/k2e.dtsi:                    dma-ranges;
> ./boot/dts/k2e.dtsi:                    dma-ranges;
> 
> So for ARM 32 the below case doesn't seem to apply.
> 

Ah, I guess that is because an empty dma-ranges property serves the same
purpose.

	Arnd
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