Linux-IIO Archive on lore.kernel.org
 help / color / Atom feed
From: Dan Robertson <dan@dlrobertson.com>
To: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Linus Walleij <linus.walleij@linaro.org>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	linux-iio@vger.kernel.org, Dan Robertson <dan@dlrobertson.com>
Subject: [PATCH 0/1] iio: accel: bma400: add support for bma400 spi
Date: Fri, 22 May 2020 01:46:33 +0000
Message-ID: <20200522014634.28505-1-dan@dlrobertson.com> (raw)

The Bosch Sensortec BMA400 3-axes ultra-low power supports a 4 wire
SPI ditital interface. This patch adds support for the device when
configured for SPI instead of I2C.

I was originally hoping to avoid using a regmap_bus definition, but the
register reads from the device are padded by a byte while register
writes are not padded. As a result, a regmap_config like the following
does not work.

const struct regmap_config bma400_regmap_spi_config = {
    reg_bits = 8,
    pad_bits = 8,
    val_bits = 8,
    read_flag_mask = BIT(7),
    max_register = BMA400_CMD_REG,
};

I used a regmap_bus structure with read and write implementations to
work around this, but would appreciate feedback on this approach and
my implementation.

Cheers,

 - Dan

Dan Robertson (1):
  iio: accel: bma400: add support for bma400 spi

 drivers/iio/accel/Kconfig      |   8 ++-
 drivers/iio/accel/Makefile     |   1 +
 drivers/iio/accel/bma400_spi.c | 126 +++++++++++++++++++++++++++++++++
 3 files changed, 134 insertions(+), 1 deletion(-)
 create mode 100644 drivers/iio/accel/bma400_spi.c



             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-22  1:46 Dan Robertson [this message]
2020-05-22  1:46 ` [PATCH 1/1] " Dan Robertson
2020-05-22  8:50   ` Andy Shevchenko
2020-05-22 12:36     ` Dan Robertson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200522014634.28505-1-dan@dlrobertson.com \
    --to=dan@dlrobertson.com \
    --cc=andy.shevchenko@gmail.com \
    --cc=jic23@kernel.org \
    --cc=knaack.h@gmx.de \
    --cc=lars@metafoo.de \
    --cc=linus.walleij@linaro.org \
    --cc=linux-iio@vger.kernel.org \
    --cc=pmeerw@pmeerw.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-IIO Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-iio/0 linux-iio/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-iio linux-iio/ https://lore.kernel.org/linux-iio \
		linux-iio@vger.kernel.org
	public-inbox-index linux-iio

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-iio


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git