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2023 19:58:23 +0000 From: "Hawkins, Nick" To: Arnd Bergmann CC: "Verdun, Jean-Marie" , Jean Delvare , Guenter Roeck , Rob Herring , "krzysztof.kozlowski+dt@linaro.org" , Jonathan Corbet , Russell King , "linux-hwmon@vger.kernel.org" , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH v4 3/5] ARM: dts: add GXP Support for fans and SPI Thread-Topic: [PATCH v4 3/5] ARM: dts: add GXP Support for fans and SPI Thread-Index: AQHZH7Ntz67eM5qHOEa31meIwV2aT66a49yA//+whoCAAGpOAP//3cYA Date: Thu, 12 Jan 2023 19:58:23 +0000 Message-ID: <1E4BFECB-D29A-43CE-A521-F2A81939202F@hpe.com> References: <20230103203654.59322-1-nick.hawkins@hpe.com> <20230103203654.59322-4-nick.hawkins@hpe.com> <5ad677f3-2cbc-4ba0-bd48-2f832a72fb28@app.fastmail.com> <6bae68eb-866f-4b78-b4db-e3154feec28e@app.fastmail.com> In-Reply-To: <6bae68eb-866f-4b78-b4db-e3154feec28e@app.fastmail.com> Accept-Language: en-US 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linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org > If the two ranges are actually translated separately on the > bus, you could also decide to enumerate the translations with > a 64-bit local address and make the upper word an enumeration, > such as > ranges = <0x1 0x0 0x80000000 0xf000000>, > <0x2 0x0 0xc0000000 0x30000000>; I am not finding a good example on how this would affect the node addresses and reg properties. I believe I will stick with the current format if that is acceptable. > Now it almost matches, except for the final byte, as the > range actually ends at 0xfffffffe not 0xffffffff if you make > the size one byte less than 1GB. > Is there a special register in the last byte? No there is not I will now have ranges as: ranges = <0x0 0x80000000 0xf000000>, /* 0x80000000 - 0x8f000000 */ <0x40000000 0xc0000000 0x40000000>; /* 0xc0000000 - 0xffffffff */ > I suppose the physical address in the old mapping was actually > outside of the 0xc0000000-0xefffffff range, so it wasn't > even accessible. If the addresses are interpreted to wrap around > at the end of the mapping, that would have made the CPU visible > address 0xe0f00000 (0xc0000000 + (0x80f00000 % 0x30000000)). > If it just wrapped around as a 32-bit number, it would be > 0x40f00000 ((0xc0000000 + 0x80f00000)% 0x100000000), but I > don't see you you'd get to 80f00000. It was not intended to wrap around; it was an error before and was not accessible. The updated section of the device tree will be: ahb@80000000 { compatible = "simple-bus"; #address-cells = <1>; #size-cells = <1>; ranges = <0x0 0x80000000 0xf000000>, /* 0x80000000 - 0x8f000000 */ <0x40000000 0xc0000000 0x40000000>; /* 0xc0000000 - 0xffffffff */ dma-ranges; ... vic0: interrupt-controller@4eff0000 { /* 0xceff0000 */ compatible = "arm,pl192-vic"; reg = <0x4eff0000 0x1000>; interrupt-controller; #interrupt-cells = <1>; }; vic1: interrupt-controller@f00000 { /* 0x80f00000 */ compatible = "arm,pl192-vic"; reg = <0xf00000 0x1000>; interrupt-controller; #interrupt-cells = <1>; }; ... }; Thanks, -Nick Hawkins _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel