linux-kernel - Re: [PATCH v2] eeprom: at25: Add DT support for EEPROMs with odd address bits

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Message-ID: <CAMSQXEFD5B+J0=jLKss1Bq=PmyAv=ZJH50pg6DtBi4tTE53S_g@mail.gmail.com>
Date:   Wed, 13 Dec 2017 11:37:27 +0100
From:   Ivo Sieben <meltedpianoman@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wolfram Sang <wsa@...-dreams.de>, devicetree@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] eeprom: at25: Add DT support for EEPROMs with odd
 address bits

2017-12-12 21:54 GMT+01:00 Rob Herring <robh@...nel.org>:
> On Fri, Dec 08, 2017 at 02:46:41PM +0100, Geert Uytterhoeven wrote:
>> Certain EEPROMS have a size that is larger than the number of address
>> bytes would allow, and store the MSB of the address in bit 3 of the
>> instruction byte.
>>
>> This can be described in platform data using EE_INSTR_BIT3_IS_ADDR, or
>> in DT using the obsolete legacy "at25,addr-mode" property.
>> But currently there exists no non-deprecated way to describe this in DT.
>>
>> Hence extend the existing "address-width" DT property to allow
>> specifying 9 address bits, and enable support for that in the driver.
>>
>> This has been tested with a Microchip 25LC040A.
>>
>> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> ---
>> v2:
>>   - Do not consider odd address widths of 17 or 25 bits,
>>   - Move handling inside the switch() statement.
>> ---
>>  Documentation/devicetree/bindings/eeprom/at25.txt | 4 +++-
>>  drivers/misc/eeprom/at25.c                        | 3 +++
>>  2 files changed, 6 insertions(+), 1 deletion(-)
>
> Reviewed-by: Rob Herring <robh@...nel.org>

Reviewed-by: Ivo Sieben <meltedpianoman@...il.com>