From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1426255AbcBRMR3 (ORCPT ); Thu, 18 Feb 2016 07:17:29 -0500 Received: from mout.kundenserver.de ([212.227.126.131]:51081 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1425438AbcBRMR0 (ORCPT ); Thu, 18 Feb 2016 07:17:26 -0500 From: Arnd Bergmann To: Vladimir Murzin Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux@arm.linux.org.uk, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, gregkh@linuxfoundation.org, daniel.lezcano@linaro.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, andy.shevchenko@gmail.com, galak@codeaurora.org, linux-serial@vger.kernel.org, u.kleine-koenig@pengutronix.de, tglx@linutronix.de, linux-api@vger.kernel.org, jslaby@suse.cz, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v3 09/10] ARM: dts: introduce MPS2 AN385/AN386 Date: Thu, 18 Feb 2016 13:16:28 +0100 Message-ID: <5567140.dIBhKTnriP@wuerfel> User-Agent: KMail/4.11.5 (Linux/3.16.0-10-generic; KDE/4.11.5; x86_64; ; ) In-Reply-To: <56C5A742.8010304@arm.com> References: <1455617295-23736-1-git-send-email-vladimir.murzin@arm.com> <7245560.jfhuhtPsB8@wuerfel> <56C5A742.8010304@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-Provags-ID: V03:K0:6Nrv4v0Wh1gXIs88yGetb5BSVovFs2YOTfOiwvJxFuaKpC2ULxC xJmQAwmkfQDCbh9kFRpw+Lb7p/D9vZulfdELZYE+cOiy0J3nhj8VYbnu/ezeyF+Vy2HbwqA Zjp6VeAXZCiHdmZteyQ6uuWkCeH9Ob5SxW8+hMGnUQwLuCJg+Ojj5MsXZUP4KDPx83I08Yh Kd/ipVrmXUpgShQhEBhXw== X-UI-Out-Filterresults: notjunk:1;V01:K0:UN2nx1H8mjw=:UntJpzUezwpB5ID/XthPPD dJgnTEXItIw3bheKmng0gsTXJxkYf5RBfI7PMQXvNTlEqpeuxbCeiY4Wa5KsgVY3EYMBw3lOw 9Yb0BJy2PFl1wCNWCI0m4Z6429WK4PhTd8DNuKQW5Sdm9YAU0ngzx1llWZfBR8FqtTJYDt5Cn /hxcaygwV00Dy3F+OJ4HvApJLDxoAnsfykKUjZ4K/LM1KESFynVdv71hUDXrVngwkXKaYzju+ tcj5tZN3EkxxgVGdabH2pVywF7I49RJuV4Hv6/NGPBE2UmGIjSuqQmFzFEj893sFC7w/nDmLi xb5k48Yee/2KpqosIKkgks5ImGY5L1B57SKxBlJYZfFDbEeDcezD7Pz20ijmuCQWT5C7xc7v8 +mB5hce8fZ7x2jeS6+Uxsq4X1G96aQn5kUuvKcnt0EobHm1+VhGjyQ6qCvkxubqCjeLObY40p fRqzQYsk6dsV0MExxgJBrcas6Af7LiShCpg/ZZOIzgZ9YFhdX+WN/UFXwHSEqzWqPncmz16un ad2iPiakycm7VxuhmDka4j40qX/a0Grzj2OKd4j5ZK6w0K8hoUrDblL/1hu5LvXUiSeJUltYi l8tKX+U8xnsKFJ0nUZkpXXtwTb5X4etQlB9l4YIrzn58l1GntJkJpKv4CZN7ttYtiA2JqCF90 EyMdBIx5fbMm3e9Ky27qskw06KukYw/Y/4ZYMmsgn6qfTD0PyuCZxkVM7eMqoAFCtKXNYmMXE 220+IPXE2i1RPOHC Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 18 February 2016 11:13:06 Vladimir Murzin wrote: > On 18/02/16 10:45, Arnd Bergmann wrote: > > On Thursday 18 February 2016 10:11:37 Vladimir Murzin wrote: > >> > >> Right, I thought in a wrong way, in opposite it makes more sense now. > >> > >> .dtsi > >> > >> /* below the soc/ */ > >> smb { > >> compatible = "simple-bus"; > >> #address-cells = <2>; > >> #size-cells = <1>; > >> ranges = <0 0 0x40200000 0x10000>, > >> <1 0 0xa0000000 0x10000>; > >> }; > > > > That looks good, yes. > > > > Is 0x10000 the correct maximum addressable size of the external bus > > in both cases? > > > > Intuitively, I would guess that the 0xa0000000 range might > > be much wider. > > There is only Ethernet connected to this bus (apart from PSRAM), so it > might be wider, but there is no indication of this in documentation. I see this called "ahb_to_extmem16" in the documentation, which indicates that it might be use 16 bits of address space, which would match the 64K you listed. For SSRAM1 / SSRAM2 / SSRAM3, a 8 MB address space is mentioned and 16 MB for external PSRAM at 0x21000000. Arnd