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c=relaxed/simple; d=kernel.org; s=k20201202; t=1645270490; bh=OKlx/FClzpOEQUKVzcalOiKnCJi/40i0qewDv8BgHPk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=iZZfI8YVIrxGEKJgw6YE1friXXRNqMKmn+EZ2pOmjl6e7iv1dR4smYUJ0TIql5N4h 55GAF2aF8BVJCtcItJP9eLMLN92paTVJq12ToiaTP+cI7k1uiRZZVPYJufrJt/N106 Uk5l4hpylO7PLV0ffa6IJzlcxTnldY2nfIytL6aCeiuUKw2mUhYrYPRDTuV1JbZDa7 4K3nFTdepXCh8rKgIoeOIuZr78nZMe7Ub9VsIOHJlqZbVt4MRo5QeCPZOhIlTWmpQW GROHThbBgFeZIzalITvuUY7SVyCQstk9RlbHBltyI0OWixRVFUaf8TPJmiV8zTgdWV MCPml7EByuZ2A== Date: Sat, 19 Feb 2022 12:34:45 +0100 From: Marek =?UTF-8?B?QmVow7pu?= To: Pali =?UTF-8?B?Um9ow6Fy?= Cc: Andrew Lunn , Gregory Clement , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] arm64: dts: marvell: armada-37xx: Remap IO space to bus address 0x0 Message-ID: <20220219123445.14940a12@thinkpad> In-Reply-To: <20220218212526.16021-1-pali@kernel.org> References: <20220218212526.16021-1-pali@kernel.org> X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 18 Feb 2022 22:25:26 +0100 Pali Roh=C3=A1r wrote: > Remap PCI I/O space to the bus address 0x0 in the Armada 37xx > device-tree in order to support legacy I/O port based cards which have > hardcoded I/O ports in low address space. >=20 > Some legacy PCI I/O based cards do not support 32-bit I/O addressing. >=20 > Since commit 64f160e19e92 ("PCI: aardvark: Configure PCIe resources from > 'ranges' DT property") this driver can work with I/O windows which have > a different address for CPU than for PCI bus (unless there is some > conflict with other A37xx mapping), without needing additional support > for this in the firmware. >=20 > Note that DDR on A37xx is mapped to bus address 0x0 and that mapping of > I/O space can be set to address 0x0 too because MEM space and I/O space > are separate and so they do not conflict. >=20 > Signed-off-by: Pali Roh=C3=A1r > Reported-by: Arnd Bergmann Reviewed-by: Marek Beh=C3=BAn