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Tue, 7 Dec 2021 07:47:51 +0000 From: To: , CC: , , , , , , , , , Subject: Re: [PATCH v3 2/3] spi: dt-bindings: Describe stacked/parallel memories modes Thread-Topic: [PATCH v3 2/3] spi: dt-bindings: Describe stacked/parallel memories modes Thread-Index: AQHX6z0TCMDia/NjPUS/CLh9E6BmLqwmpcIAgAABPIA= Date: Tue, 7 Dec 2021 07:47:51 +0000 Message-ID: References: <20211206095921.33302-1-miquel.raynal@bootlin.com> <20211206095921.33302-3-miquel.raynal@bootlin.com> <20211207071406.c2ajc3shqybevvjj@ti.com> <0d97a420-685e-5120-3c09-d433382c02aa@microchip.com> <11cb8408-1c5b-de83-dec0-5ec67305e772@microchip.com> In-Reply-To: <11cb8408-1c5b-de83-dec0-5ec67305e772@microchip.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microchip.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 040bb5a1-6f29-423d-01c7-08d9b955df0e x-ms-traffictypediagnostic: SA2PR11MB5161:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:1360; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 12/7/21 9:43 AM, Tudor Ambarus wrote: > On 12/7/21 9:35 AM, Tudor Ambarus wrote: >> On 12/7/21 9:14 AM, Pratyush Yadav wrote: >>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >>> >>> On 06/12/21 10:59AM, Miquel Raynal wrote: >>>> Describe two new memories modes: >>>> - A stacked mode when the bus is common but the address space extended >>>> with an additinals wires. >>>> - A parallel mode with parallel busses accessing parallel flashes where >>>> the data is spread. >>>> >>>> Signed-off-by: Miquel Raynal >>>> --- >>>> .../bindings/spi/spi-peripheral-props.yaml | 21 +++++++++++++++++++ >>>> 1 file changed, 21 insertions(+) >>>> >>>> diff --git a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml >>>> index 5dd209206e88..13aa6a2374c9 100644 >>>> --- a/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml >>>> +++ b/Documentation/devicetree/bindings/spi/spi-peripheral-props.yaml >>>> @@ -82,6 +82,27 @@ properties: >>>> description: >>>> Delay, in microseconds, after a write transfer. >>>> >>>> + stacked-memories: >>>> + type: boolean >>> >>> I don't think a boolean is enough to completely describe the memory. >>> Sure, you say the memories are stacked, but where do you specify when to >>> switch the CS? They could be two 512 MiB memories, two 1 GiB memories, >>> or one 512 MiB and one 256 MiB. >> >> If the multi-die flash contains identical dies then the die boundary can be >> determined with flash_size / number_of_cs. Are there any multi die flashes > > but the problem is there, yes, there is still the case where there are stacked > devices with a single cs. We'll need to describe the size of the die in some > way. > Even better, winbond stacks a NOR and a NAND: https://www.winbond.com/hq/product/code-storage-flash-memory/spistack-flash/?__locale=en ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/