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Sun, 04 Feb 2024 13:57:01 -0800 (PST) Message-ID: Date: Sun, 4 Feb 2024 13:56:59 -0800 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 03/12] dt-bindings: mtd: brcmnand: Add ecc strap property To: Conor Dooley Cc: Linux MTD List , Linux ARM List , Broadcom Kernel List , f.fainelli@gmail.com, kursad.oney@broadcom.com, joel.peshkin@broadcom.com, anand.gore@broadcom.com, dregan@mail.com, kamal.dasu@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, devicetree@vger.kernel.org, Brian Norris , linux-kernel@vger.kernel.org, Conor Dooley , Krzysztof Kozlowski , Vignesh Raghavendra , Miquel Raynal , Richard Weinberger , Kamal Dasu , Rob Herring References: <20240203002834.171462-1-william.zhang@broadcom.com> <20240203002834.171462-4-william.zhang@broadcom.com> <20240203-expenses-tarmac-c564bc7ae34f@spud> From: William Zhang In-Reply-To: <20240203-expenses-tarmac-c564bc7ae34f@spud> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000f343640610956c19" --000000000000f343640610956c19 Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 2/3/24 06:49, Conor Dooley wrote: > On Fri, Feb 02, 2024 at 04:28:24PM -0800, William Zhang wrote: >> Add brcm,nand-ecc-use-strap to get ecc and spare area size settings from >> board boot strap for broadband board designs because they do not specify >> ecc setting in dts but rather using the strap setting. >> >> Signed-off-by: William Zhang >> >> --- >> >> Changes in v4: >> - Move ecc strap property to this separate patch and remove some >> non-binding related text from the description >> >> Changes in v3: None >> Changes in v2: None >> >> Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml | 8 ++++++++ >> 1 file changed, 8 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml b/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml >> index d0168d55c73e..2599d902ec3a 100644 >> --- a/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml >> +++ b/Documentation/devicetree/bindings/mtd/brcm,brcmnand.yaml >> @@ -147,6 +147,14 @@ patternProperties: >> layout. >> $ref: /schemas/types.yaml#/definitions/uint32 >> >> + brcm,nand-ecc-use-strap: >> + description: >> + This flag indicates the ecc strength and spare area size should >> + be retrieved from the SoC NAND boot strap setting instead of >> + nand-ecc-strength and brcm,nand-oob-sector-size or auto detection. > > I'm still on the fence about this being overly prescriptive about the > operating systems behaviour. I think it would be good to say why the > strap values are better than those explicitly provided in DT rather than > just saying "these strap values should be used". > This is a board/SoC design choice. I wouldn't advise it as better choice as other board/SoC may not have that option. But definitively for BCMBCA SoC board design, it is better and much easier and convenient option than explicit dt setting. How about: This property provides a choice for retrieving ecc strength and spare area size from the SoC NAND boot strap setting. It is commonly used by the BCMBCA SoC board design. >> + This is commonly used by the BCMBCA SoC board design. >> + $ref: /schemas/types.yaml#/definitions/flag >> + >> unevaluatedProperties: false >> >> allOf: >> -- >> 2.37.3 >> --000000000000f343640610956c19 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t 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