linux-kernel - Reply to [RFC PATCH v2 0/1] Adding support for IIO SCMI based sensors

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Message-Id: <20210105230920.769144-1-jbhayana@google.com>
Date:   Tue,  5 Jan 2021 23:09:20 +0000
From:   Jyoti Bhayana <jbhayana@...gle.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Jyoti Bhayana <jbhayana@...gle.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        cristian.marussi@....com, sudeep.holla@....com,
        egranata@...gle.com, mikhail.golubev@...nsynergy.com,
        Igor.Skalkin@...nsynergy.com, Peter.hilber@...nsynergy.com,
        ankitarora@...gle.com
Subject: Reply to [RFC PATCH v2 0/1] Adding support for IIO SCMI based sensors

Hi Jonathan,

> So, sensor_max_range can effectively be exposed as a combination of
> scale and the *_raw_avail for a raw read (via the read_avail callback in IIO).
> We'll ignore the fact the interface assumes a single value (so I assume symmetric?)

Based on the SCMI specification the sensor min range and max range are 64 bits signed number.

looks like IIO_AVAIL_RANGE can only take the following
types of data which all looks like 32 bit. IIO_VAL_FRACTIONAL
also takes two int type numbers.
How can I send 64 bit sensor range using this and read_avail callback?

#define IIO_VAL_INT 1
#define IIO_VAL_INT_PLUS_MICRO 2
#define IIO_VAL_INT_PLUS_NANO 3
#define IIO_VAL_INT_PLUS_MICRO_DB 4
#define IIO_VAL_INT_MULTIPLE 5
#define IIO_VAL_FRACTIONAL 10
#define IIO_VAL_FRACTIONAL_LOG2 11
#define IIO_VAL_CHAR 12



Thanks,
Jyoti