From: Mark Brown <broonie@kernel.org>
To: Crestez Dan Leonard <leonard.crestez@intel.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Daniel Baluta <daniel.baluta@intel.com>,
Ge Gao <GGao@invensense.com>, Peter Rosin <peda@axentia.se>
Subject: Re: [RFC 0/7] iio: inv_mpu6050: Support i2c master and external readings
Date: Tue, 3 May 2016 12:32:00 +0100 [thread overview]
Message-ID: <20160503113200.GN6292@sirena.org.uk> (raw)
In-Reply-To: <572889C4.40806@intel.com>
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On Tue, May 03, 2016 at 02:21:40PM +0300, Crestez Dan Leonard wrote:
> I have a device which has several registers with bits that are a mix of
> "cacheable" and "volatile". For example for register SLV4_CTRL:
> - Bit 7 (I2C_SLV4_EN) triggers a transaction with slave 4 when a "1" is
> written. The bit is cleared when the transaction is done.
> - Bits 0-4 (I2C_MST_DLY) configures the reduced access rate of I2C
> slaves relative to the device sample rate. This applies to slaves 0-3 as
> well.
> If I2C_MST_DLY was a separate register it could be easily cached by
> regmap. Because it's part of a volatile register I have to add a
> private_data field caching the value and always write it when triggering
> a SLV4 transfer.
> Jonathan was wondering if regmap can still be used somehow instead of
> custom caching.
If you want to cache in regmap just write a 0 back to the enable bit
after you've set it.
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next prev parent reply other threads:[~2016-05-03 11:32 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-29 19:02 [RFC 0/7] iio: inv_mpu6050: Support i2c master and external readings Crestez Dan Leonard
2016-04-29 19:02 ` [PATCH 1/7] iio: inv_mpu6050: Do burst reads using spi/i2c directly Crestez Dan Leonard
2016-05-01 17:11 ` Jonathan Cameron
2016-05-02 15:24 ` Mark Brown
2016-04-29 19:02 ` [PATCH 2/7] iio: inv_mpu6050: Initial regcache support Crestez Dan Leonard
2016-05-01 17:12 ` Jonathan Cameron
2016-04-29 19:02 ` [PATCH 3/7] iio: inv_mpu6050: Only toggle DATA_RDY_EN in inv_reset_fifo Crestez Dan Leonard
2016-05-01 17:13 ` Jonathan Cameron
2016-04-29 19:02 ` [PATCH 4/7] iio: inv_mpu6050: Cache non-volatile bits of user_ctrl Crestez Dan Leonard
2016-05-01 17:14 ` Jonathan Cameron
2016-04-29 19:02 ` [PATCH 6/7] iio: inv_mpu6050: Check channel configuration on preenable Crestez Dan Leonard
2016-05-01 17:34 ` Jonathan Cameron
2016-05-03 13:01 ` Crestez Dan Leonard
2016-05-04 9:01 ` Jonathan Cameron
2016-05-04 15:34 ` Crestez Dan Leonard
2016-05-04 18:22 ` Jonathan Cameron
2016-04-29 19:02 ` [RFC 7/7] iio: inv_mpu6050: Add support for external sensors Crestez Dan Leonard
2016-05-01 17:54 ` Jonathan Cameron
2016-05-01 17:04 ` [RFC 0/7] iio: inv_mpu6050: Support i2c master and external readings Jonathan Cameron
2016-05-02 15:23 ` Mark Brown
2016-05-03 11:21 ` Crestez Dan Leonard
2016-05-03 11:32 ` Mark Brown [this message]
[not found] ` <4aeaced7c1c8e222996df4c1b4b71e505ab256f7.1461953982.git.leonard.crestez@intel.com>
2016-05-01 17:27 ` [RFC 5/7] iio: inv_mpu6050: Add support for auxiliary I2C master Jonathan Cameron
2016-05-05 12:38 ` Crestez Dan Leonard
2016-05-05 13:10 ` Rob Herring
2016-05-02 15:31 ` Peter Rosin
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