From mboxrd@z Thu Jan 1 00:00:00 1970 From: pullip.cho@samsung.com (Cho KyongHo) Date: Fri, 09 Aug 2013 11:24:36 +0900 Subject: [PATCH v8 06/12] ARM: dts: Add description of System MMU of Exynos SoCs In-Reply-To: <20130808214343.GA19383@mudshark.cambridge.arm.com> References: <003c01ce89f3$3abc4bc0$b034e340$@samsung.com> <003801ce8eb7$d7647f10$862d7d30$@samsung.com> <5354557.DijgoUKjW2@flatron> <20130808214343.GA19383@mudshark.cambridge.arm.com> Message-ID: <20130809112436.8e44545cd503ca5a2b55a8cd@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, 08 Aug 2013 22:43:43 +0100, Will Deacon wrote: > On Thu, Aug 08, 2013 at 10:38:10PM +0100, Tomasz Figa wrote: > > On Thursday 08 of August 2013 08:09:49 Rob Herring wrote: > > > On Thu, Aug 1, 2013 at 8:05 AM, Cho KyongHo > > wrote: > > > > Should this align with ARM System MMU bindings? > > > > System MMU in Exynos SoC is different from ARM System MMU. > > > > It does not follows the specifications of ARM System MMU. > > > > > > I'm not saying the h/w is the same or even the same spec, but how you > > > describe a master to iommu connection needs to be done in the same > > > way. This should be done in the same way for ALL iommu's. And if what > > > is defined does not work for you, then we need to understand that and > > > fix the binding now. > > > > +1 > > > > All IOMMUs should use a generic IOMMU Device Tree bindings (and in > > general, the same should be true for all Device Tree bindings). > > > > This means that if we already have some bindings for IOMMU, then they > > should be reused if possible or extended if there is anything missing. > > > > Of course there might be things that such generic bindings can't specify. > > In this case device-specific properties can be introduced, but this is > > last resort. > > I'm also happy to discuss and/or review bindings in light of what we did for > the ARM SMMU. > > Will Rob, I now understood what you are talking about. Do you mean the binding description is lack of details about connection betwen System MMU and its master? thanks. KyongHo.