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Tue, 21 Sep 2021 08:42:55 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Tue, 21 Sep 2021 08:42:55 -0500 Received: from [10.250.233.5] (ileax41-snat.itg.ti.com [10.172.224.153]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 18LDgooc056968; Tue, 21 Sep 2021 08:42:51 -0500 Subject: Re: [PATCH v2 1/2] dt-bindings: mtd: spi-nand: Convert to DT schema format To: Rob Herring , Serge Semin CC: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Mark Brown , , , , , References: <20210920142713.129295-1-a-nandan@ti.com> <20210920142713.129295-2-a-nandan@ti.com> <20210920150651.vvdhennblwhdi3jw@mobilestation> From: Apurva Nandan Message-ID: <3c03fcdd-b015-8fda-eadc-e1b6d24ba88d@ti.com> Date: Tue, 21 Sep 2021 19:12:49 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210921_064302_569704_21AFAC4B X-CRM114-Status: GOOD ( 30.62 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org Hi Rob, On 21/09/21 2:46 am, Rob Herring wrote: > On Mon, Sep 20, 2021 at 06:06:51PM +0300, Serge Semin wrote: >> Hello Apurva >> >> On Mon, Sep 20, 2021 at 07:57:12PM +0530, Apurva Nandan wrote: >>> Convert spi-nand.txt binding to YAML format with an added example. >>> >>> Signed-off-by: Apurva Nandan >>> --- >>> .../devicetree/bindings/mtd/spi-nand.txt | 5 -- >>> .../devicetree/bindings/mtd/spi-nand.yaml | 62 +++++++++++++++++++ >>> 2 files changed, 62 insertions(+), 5 deletions(-) >>> delete mode 100644 Documentation/devicetree/bindings/mtd/spi-nand.txt >>> create mode 100644 Documentation/devicetree/bindings/mtd/spi-nand.yaml >> Thanks for the bindings conversion patch. There are several comments >> below. But before addressing them it would be better to also get a >> response from Rob. >> >>> diff --git a/Documentation/devicetree/bindings/mtd/spi-nand.txt b/Documentation/devicetree/bindings/mtd/spi-nand.txt >>> deleted file mode 100644 >>> index 8b51f3b6d55c..000000000000 >>> --- a/Documentation/devicetree/bindings/mtd/spi-nand.txt >>> +++ /dev/null >>> @@ -1,5 +0,0 @@ >>> -SPI NAND flash >>> - >>> -Required properties: >>> -- compatible: should be "spi-nand" >>> -- reg: should encode the chip-select line used to access the NAND chip >>> diff --git a/Documentation/devicetree/bindings/mtd/spi-nand.yaml b/Documentation/devicetree/bindings/mtd/spi-nand.yaml >>> new file mode 100644 >>> index 000000000000..601beba8d971 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/mtd/spi-nand.yaml >>> @@ -0,0 +1,62 @@ >>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) >>> +%YAML 1.2 >>> +--- >>> +$id: http://devicetree.org/schemas/mtd/spi-nand.yaml# >>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>> + >>> +title: SPI NAND flash >>> + >>> +maintainers: >>> + - Apurva Nandan >>> + >>> +allOf: >>> + - $ref: "mtd.yaml#" >>> + >>> +properties: >>> + compatible: >>> + const: spi-nand >>> + >>> + reg: >>> + maxItems: 1 >>> + >>> + spi-max-frequency: true >>> + spi-rx-bus-width: true >>> + spi-tx-bus-width: true >>> + rx-sample-delay-ns: true >> Since it's an SPI-client device there are more than these properties >> could be set for it. See the SPI-controller bindings schema: >> Documentation/devicetree/bindings/spi/spi-controller.yaml >> So there is two possible ways to make it more generic: >> 1) Detach the spi-client part from the spi-controller.yaml bindings >> into a dedicated DT-schema file and refer to that new scheme from >> here. > Yes, as mentioned there's patches doing this. But the above is fine. > There's some value in defining here which properties are valid. Yeah right >> 2) Forget about these controller-specific properties and let the >> parental SPI-controller bindings parsing them. Of course there must be >> at least one of the next properties declared for it to work: >> {unevaluatedProperties, additionalProperties}. >> >> It's up to Rob to decided which approach is better though... >> >>> + >>> + '#address-cells': true >>> + '#size-cells': true >> Aren't they always equal to 1? > No SPI nand devices >4GB? Yeah, we have SPI NANDs >4GB, and "'#address-cells': true" allows those sizes. > >>> + >>> +additionalProperties: >>> + type: object >> I'd suggest to elaborate the way the partition sub-nodes looks >> like, for instance, the node names, supported compatible names, >> labels, etc. > That should probably all be in mtd.yaml. The question here is whether > partitions are always under a 'partitions' node. Maybe this is new > enough that only the new way has to be supported. Though if mtd.yaml > supported both forms, allowing both all the time is okay IMO. > > Rob I had added the "partition" node properties in the v1 patch, but as per the reviews I removed it. I think we can prefer having them in mtd.yaml if needed, in a separate patch series. Do you prefer the mtd.yaml changes as a part of this series or as a separate patch? Other than that, I don't find any need for a v3 patch re-roll, do you agree? Thanks, Apurva Nandan ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/