linux-kernel - Re: [PATCH v7] dt-bindings: mtd: spi-nor: add optional interrupts property

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Date: Wed, 21 Feb 2024 11:48:41 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: "Michael Walle" <mwalle@...nel.org>
Cc: "Josua Mayer" <josua@...id-run.com>,  "Tudor Ambarus"
 <tudor.ambarus@...aro.org>,  "Pratyush Yadav" <pratyush@...nel.org>,
  "Miquel Raynal" <miquel.raynal@...tlin.com>,  "Richard Weinberger"
 <richard@....at>,  "Vignesh Raghavendra" <vigneshr@...com>,  "Rob Herring"
 <robh+dt@...nel.org>,  "Krzysztof Kozlowski"
 <krzysztof.kozlowski+dt@...aro.org>,  "Conor Dooley"
 <conor+dt@...nel.org>,  <linux-mtd@...ts.infradead.org>,  "Takahiro
 Kuwano" <tkuw584924@...il.com>,  "Takahiro Kuwano"
 <Takahiro.Kuwano@...ineon.com>,  "Yazan Shhady"
 <yazan.shhady@...id-run.com>,  "Rob Herring" <robh@...nel.org>,
  <devicetree@...r.kernel.org>,  <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7] dt-bindings: mtd: spi-nor: add optional interrupts
 property

On Wed, Feb 21 2024, Michael Walle wrote:

> [+ Takahiro]
>
> Hi,
>
> On Wed Feb 21, 2024 at 10:13 AM CET, Josua Mayer wrote:
>> Hi,
>>
>> Am 21.02.24 um 09:27 schrieb Michael Walle:
>> > Hi,
>> >
>> > On Mon Feb 19, 2024 at 3:41 PM CET, Josua Mayer wrote:
>> >> Some spi flash memories have an interrupt signal which can be used for
>> >> signalling on-chip events such as busy status or ecc errors to the host.
>> > Do you have an example? Maybe one with a public datasheet?
>>
>> My example is Infineon S28HS512T, however datasheet download requires 
>> user account.
>>
>> S26HS512T has interrupt line, too, and datasheet is downloadable without 
>> registration:
>> https://www.infineon.com/cms/en/product/memories/nor-flash/semper-nor-flash-family/semper-nor-flash/#!documents
>
> Thanks, as far as I can see, both are hyperbus flashes. I'm asking
> because I'm not aware of any SPI NOR flash with an interrupt line. 

I found this datasheet [0] for S28H flash family from Infineon on
Google. These are SPI NOR flashes. In pinout you can see there is an
INT# signal. The signal description says: "System Interrupt (INT#). When
LOW, the device is indicating that an internal event has occurred."
Further in section 4.1.1.5 "INT# Output" it says:

    HL-T/HS-T supports INT# output pin to indicate to the host system
    that an event has occurred within the flash device. The user can
    configure the INT# output pin to transition to the active (LOW)
    state when:

    - 2-bit ECC error is detected
    - 1-bit ECC error is detected
    - Transitioning from the Busy to the Ready state

[0] https://www.infineon.com/dgdl/Infineon-S28HS256T_S28HS512T_S28HS01GT_S28HL256T_S28HL512T_S28HL01GT_256-Mb_(32-MB)_512-Mb_(64-MB)_1-Gb_(128-MB)_HS-T_(1.8-V)_HL-T_(3.0-V)_Semper_Flash_with_Octal_Interface-DataSheet-v03_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0ee6bca96f97&da=t

-- 
Regards,
Pratyush Yadav