* [PATCH v2 0/1] iio: accel: bma400: add support for bma400 spi
@ 2020-05-30 19:10 Dan Robertson
2020-05-30 19:10 ` [PATCH v2 1/1] " Dan Robertson
0 siblings, 1 reply; 5+ messages in thread
From: Dan Robertson @ 2020-05-30 19:10 UTC (permalink / raw)
To: Jonathan Cameron
Cc: Hartmut Knaack, Lars-Peter Clausen, Peter Meerwald-Stadler,
Linus Walleij, Andy Shevchenko, linux-iio, Dan Robertson
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.
Cheers,
- Dan
Changes in v2
- Addressed code review comments
- Fixed bad Kconfig selects
- Fixed comments
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 | 120 +++++++++++++++++++++++++++++++++
3 files changed, 128 insertions(+), 1 deletion(-)
create mode 100644 drivers/iio/accel/bma400_spi.c
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/1] iio: accel: bma400: add support for bma400 spi
2020-05-30 19:10 [PATCH v2 0/1] iio: accel: bma400: add support for bma400 spi Dan Robertson
@ 2020-05-30 19:10 ` Dan Robertson
2020-05-31 9:10 ` Jonathan Cameron
0 siblings, 1 reply; 5+ messages in thread
From: Dan Robertson @ 2020-05-30 19:10 UTC (permalink / raw)
To: Jonathan Cameron
Cc: Hartmut Knaack, Lars-Peter Clausen, Peter Meerwald-Stadler,
Linus Walleij, Andy Shevchenko, linux-iio, Dan Robertson
Add basic support for the Bosch Sensortec BMA400 3-axes ultra-low power
accelerometer when configured to use SPI.
Signed-off-by: Dan Robertson <dan@dlrobertson.com>
---
drivers/iio/accel/Kconfig | 8 ++-
drivers/iio/accel/Makefile | 1 +
drivers/iio/accel/bma400_spi.c | 120 +++++++++++++++++++++++++++++++++
3 files changed, 128 insertions(+), 1 deletion(-)
create mode 100644 drivers/iio/accel/bma400_spi.c
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 1080637ca40e..2e0c62c39155 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -116,18 +116,24 @@ config BMA400
tristate "Bosch BMA400 3-Axis Accelerometer Driver"
select REGMAP
select BMA400_I2C if I2C
+ select BMA400_SPI if SPI
help
Say Y here if you want to build a driver for the Bosch BMA400
triaxial acceleration sensor.
To compile this driver as a module, choose M here: the
module will be called bma400_core and you will also get
- bma400_i2c if I2C is enabled.
+ bma400_i2c if I2C is enabled and bma400_spi if SPI is
+ enabled.
config BMA400_I2C
tristate
depends on BMA400
+config BMA400_SPI
+ tristate
+ depends on BMA400
+
config BMC150_ACCEL
tristate "Bosch BMC150 Accelerometer Driver"
select IIO_BUFFER
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 3a051cf37f40..4f6c1ebe13b0 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_BMA180) += bma180.o
obj-$(CONFIG_BMA220) += bma220_spi.o
obj-$(CONFIG_BMA400) += bma400_core.o
obj-$(CONFIG_BMA400_I2C) += bma400_i2c.o
+obj-$(CONFIG_BMA400_SPI) += bma400_spi.o
obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
diff --git a/drivers/iio/accel/bma400_spi.c b/drivers/iio/accel/bma400_spi.c
new file mode 100644
index 000000000000..7c2825904e08
--- /dev/null
+++ b/drivers/iio/accel/bma400_spi.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SPI IIO driver for Bosch BMA400 triaxial acceleration sensor.
+ *
+ * Copyright 2020 Dan Robertson <dan@dlrobertson.com>
+ *
+ */
+#include <linux/bits.h>
+#include <linux/init.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "bma400.h"
+
+#define BMA400_MAX_SPI_READ 2
+#define BMA400_SPI_READ_BUFFER_SIZE (BMA400_MAX_SPI_READ + 1)
+
+static int bma400_regmap_spi_read(void *context,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+ u8 result[BMA400_SPI_READ_BUFFER_SIZE];
+ ssize_t status;
+
+ if (val_size > BMA400_MAX_SPI_READ)
+ return -EINVAL;
+
+ status = spi_write_then_read(spi, reg, 1, result, val_size + 1);
+ if (status)
+ return status;
+
+ /*
+ * From the BMA400 datasheet:
+ *
+ * > For a basic read operation two bytes have to be read and the first
+ * > has to be dropped and the second byte must be interpreted.
+ */
+ memcpy(val, result + 1, val_size);
+
+ return 0;
+}
+
+static int bma400_regmap_spi_write(void *context, const void *data,
+ size_t count)
+{
+ struct device *dev = context;
+ struct spi_device *spi = to_spi_device(dev);
+
+ return spi_write(spi, data, count);
+}
+
+static struct regmap_bus bma400_regmap_bus = {
+ .read = bma400_regmap_spi_read,
+ .write = bma400_regmap_spi_write,
+ .read_flag_mask = BIT(7),
+ .max_raw_read = BMA400_MAX_SPI_READ,
+};
+
+static int bma400_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct regmap *regmap;
+ unsigned int val;
+ int ret;
+
+ regmap = devm_regmap_init(&spi->dev, &bma400_regmap_bus,
+ &spi->dev, &bma400_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "failed to create regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ /*
+ * Per the bma400 datasheet, the first SPI read may
+ * return garbage. As the datasheet recommends, the
+ * chip ID register will be read here and checked
+ * again in the following probe.
+ */
+ ret = regmap_read(regmap, BMA400_CHIP_ID_REG, &val);
+ if (ret)
+ dev_err(&spi->dev, "Failed to read chip id register\n");
+
+ return bma400_probe(&spi->dev, regmap, id->name);
+}
+
+static int bma400_spi_remove(struct spi_device *spi)
+{
+ return bma400_remove(&spi->dev);
+}
+
+static const struct spi_device_id bma400_spi_ids[] = {
+ { "bma400", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(spi, bma400_spi_ids);
+
+static const struct of_device_id bma400_of_spi_match[] = {
+ { .compatible = "bosch,bma400" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bma400_of_spi_match);
+
+static struct spi_driver bma400_spi_driver = {
+ .driver = {
+ .name = "bma400",
+ .of_match_table = bma400_of_spi_match,
+ },
+ .probe = bma400_spi_probe,
+ .remove = bma400_spi_remove,
+ .id_table = bma400_spi_ids,
+};
+
+module_spi_driver(bma400_spi_driver);
+MODULE_AUTHOR("Dan Robertson <dan@dlrobertson.com>");
+MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor (SPI)");
+MODULE_LICENSE("GPL");
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/1] iio: accel: bma400: add support for bma400 spi
2020-05-30 19:10 ` [PATCH v2 1/1] " Dan Robertson
@ 2020-05-31 9:10 ` Jonathan Cameron
2020-05-31 9:14 ` Jonathan Cameron
0 siblings, 1 reply; 5+ messages in thread
From: Jonathan Cameron @ 2020-05-31 9:10 UTC (permalink / raw)
To: Dan Robertson
Cc: Hartmut Knaack, Lars-Peter Clausen, Peter Meerwald-Stadler,
Linus Walleij, Andy Shevchenko, linux-iio
On Sat, 30 May 2020 19:10:10 +0000
Dan Robertson <dan@dlrobertson.com> wrote:
> Add basic support for the Bosch Sensortec BMA400 3-axes ultra-low power
> accelerometer when configured to use SPI.
>
> Signed-off-by: Dan Robertson <dan@dlrobertson.com>
Hi Dan.
Code looks good, but one suggestion for a possible optimization inline.
I did wonder if it would be possible to use standard spi regmap to
do this, but it seems there is only a single pad parameter for both
reads and writes so that won't work.
Jonathan
> ---
> drivers/iio/accel/Kconfig | 8 ++-
> drivers/iio/accel/Makefile | 1 +
> drivers/iio/accel/bma400_spi.c | 120 +++++++++++++++++++++++++++++++++
> 3 files changed, 128 insertions(+), 1 deletion(-)
> create mode 100644 drivers/iio/accel/bma400_spi.c
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 1080637ca40e..2e0c62c39155 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -116,18 +116,24 @@ config BMA400
> tristate "Bosch BMA400 3-Axis Accelerometer Driver"
> select REGMAP
> select BMA400_I2C if I2C
> + select BMA400_SPI if SPI
> help
> Say Y here if you want to build a driver for the Bosch BMA400
> triaxial acceleration sensor.
>
> To compile this driver as a module, choose M here: the
> module will be called bma400_core and you will also get
> - bma400_i2c if I2C is enabled.
> + bma400_i2c if I2C is enabled and bma400_spi if SPI is
> + enabled.
>
> config BMA400_I2C
> tristate
> depends on BMA400
>
> +config BMA400_SPI
> + tristate
> + depends on BMA400
> +
> config BMC150_ACCEL
> tristate "Bosch BMC150 Accelerometer Driver"
> select IIO_BUFFER
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 3a051cf37f40..4f6c1ebe13b0 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_BMA180) += bma180.o
> obj-$(CONFIG_BMA220) += bma220_spi.o
> obj-$(CONFIG_BMA400) += bma400_core.o
> obj-$(CONFIG_BMA400_I2C) += bma400_i2c.o
> +obj-$(CONFIG_BMA400_SPI) += bma400_spi.o
> obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
> obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
> obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
> diff --git a/drivers/iio/accel/bma400_spi.c b/drivers/iio/accel/bma400_spi.c
> new file mode 100644
> index 000000000000..7c2825904e08
> --- /dev/null
> +++ b/drivers/iio/accel/bma400_spi.c
> @@ -0,0 +1,120 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * SPI IIO driver for Bosch BMA400 triaxial acceleration sensor.
> + *
> + * Copyright 2020 Dan Robertson <dan@dlrobertson.com>
> + *
> + */
> +#include <linux/bits.h>
> +#include <linux/init.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/spi/spi.h>
> +
> +#include "bma400.h"
> +
> +#define BMA400_MAX_SPI_READ 2
> +#define BMA400_SPI_READ_BUFFER_SIZE (BMA400_MAX_SPI_READ + 1)
> +
> +static int bma400_regmap_spi_read(void *context,
> + const void *reg, size_t reg_size,
> + void *val, size_t val_size)
> +{
> + struct device *dev = context;
> + struct spi_device *spi = to_spi_device(dev);
> + u8 result[BMA400_SPI_READ_BUFFER_SIZE];
> + ssize_t status;
> +
> + if (val_size > BMA400_MAX_SPI_READ)
> + return -EINVAL;
> +
> + status = spi_write_then_read(spi, reg, 1, result, val_size + 1);
There is a double memcpy going on here. spi_write_then_read is using it's
own internal buffers which we then copy into result and then recopy
below into val.
How about we cheat and pad the write side by one extra byte of 0s?
That way we can pass val in directly for the read and only copy this buffer
once.
It will only help in cases where we are reading more than one byte (as
still involves a copy) but I think the bma400 core does some bulk reads.
> + if (status)
> + return status;
> +
> + /*
> + * From the BMA400 datasheet:
> + *
> + * > For a basic read operation two bytes have to be read and the first
> + * > has to be dropped and the second byte must be interpreted.
> + */
> + memcpy(val, result + 1, val_size);
> +
> + return 0;
> +}
> +
> +static int bma400_regmap_spi_write(void *context, const void *data,
> + size_t count)
> +{
> + struct device *dev = context;
> + struct spi_device *spi = to_spi_device(dev);
> +
> + return spi_write(spi, data, count);
> +}
> +
> +static struct regmap_bus bma400_regmap_bus = {
> + .read = bma400_regmap_spi_read,
> + .write = bma400_regmap_spi_write,
> + .read_flag_mask = BIT(7),
> + .max_raw_read = BMA400_MAX_SPI_READ,
> +};
> +
> +static int bma400_spi_probe(struct spi_device *spi)
> +{
> + const struct spi_device_id *id = spi_get_device_id(spi);
> + struct regmap *regmap;
> + unsigned int val;
> + int ret;
> +
> + regmap = devm_regmap_init(&spi->dev, &bma400_regmap_bus,
> + &spi->dev, &bma400_regmap_config);
> + if (IS_ERR(regmap)) {
> + dev_err(&spi->dev, "failed to create regmap\n");
> + return PTR_ERR(regmap);
> + }
> +
> + /*
> + * Per the bma400 datasheet, the first SPI read may
> + * return garbage. As the datasheet recommends, the
> + * chip ID register will be read here and checked
> + * again in the following probe.
> + */
> + ret = regmap_read(regmap, BMA400_CHIP_ID_REG, &val);
> + if (ret)
> + dev_err(&spi->dev, "Failed to read chip id register\n");
> +
> + return bma400_probe(&spi->dev, regmap, id->name);
> +}
> +
> +static int bma400_spi_remove(struct spi_device *spi)
> +{
> + return bma400_remove(&spi->dev);
> +}
> +
> +static const struct spi_device_id bma400_spi_ids[] = {
> + { "bma400", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(spi, bma400_spi_ids);
> +
> +static const struct of_device_id bma400_of_spi_match[] = {
> + { .compatible = "bosch,bma400" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, bma400_of_spi_match);
> +
> +static struct spi_driver bma400_spi_driver = {
> + .driver = {
> + .name = "bma400",
> + .of_match_table = bma400_of_spi_match,
> + },
> + .probe = bma400_spi_probe,
> + .remove = bma400_spi_remove,
> + .id_table = bma400_spi_ids,
> +};
> +
> +module_spi_driver(bma400_spi_driver);
> +MODULE_AUTHOR("Dan Robertson <dan@dlrobertson.com>");
> +MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor (SPI)");
> +MODULE_LICENSE("GPL");
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/1] iio: accel: bma400: add support for bma400 spi
2020-05-31 9:10 ` Jonathan Cameron
@ 2020-05-31 9:14 ` Jonathan Cameron
2020-06-02 2:46 ` Dan Robertson
0 siblings, 1 reply; 5+ messages in thread
From: Jonathan Cameron @ 2020-05-31 9:14 UTC (permalink / raw)
To: Dan Robertson
Cc: Hartmut Knaack, Lars-Peter Clausen, Peter Meerwald-Stadler,
Linus Walleij, Andy Shevchenko, linux-iio
On Sun, 31 May 2020 10:10:24 +0100
Jonathan Cameron <jic23@kernel.org> wrote:
> On Sat, 30 May 2020 19:10:10 +0000
> Dan Robertson <dan@dlrobertson.com> wrote:
>
> > Add basic support for the Bosch Sensortec BMA400 3-axes ultra-low power
> > accelerometer when configured to use SPI.
> >
> > Signed-off-by: Dan Robertson <dan@dlrobertson.com>
>
> Hi Dan.
>
> Code looks good, but one suggestion for a possible optimization inline.
>
> I did wonder if it would be possible to use standard spi regmap to
> do this, but it seems there is only a single pad parameter for both
> reads and writes so that won't work.
Changed my mind. See below.
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.
Note however that we should add spi stuff to the device tree binding
docs. That can happen as a follow up patch.
Thanks,
Jonathan
>
> Jonathan
>
> > ---
> > drivers/iio/accel/Kconfig | 8 ++-
> > drivers/iio/accel/Makefile | 1 +
> > drivers/iio/accel/bma400_spi.c | 120 +++++++++++++++++++++++++++++++++
> > 3 files changed, 128 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/iio/accel/bma400_spi.c
> >
> > diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> > index 1080637ca40e..2e0c62c39155 100644
> > --- a/drivers/iio/accel/Kconfig
> > +++ b/drivers/iio/accel/Kconfig
> > @@ -116,18 +116,24 @@ config BMA400
> > tristate "Bosch BMA400 3-Axis Accelerometer Driver"
> > select REGMAP
> > select BMA400_I2C if I2C
> > + select BMA400_SPI if SPI
> > help
> > Say Y here if you want to build a driver for the Bosch BMA400
> > triaxial acceleration sensor.
> >
> > To compile this driver as a module, choose M here: the
> > module will be called bma400_core and you will also get
> > - bma400_i2c if I2C is enabled.
> > + bma400_i2c if I2C is enabled and bma400_spi if SPI is
> > + enabled.
> >
> > config BMA400_I2C
> > tristate
> > depends on BMA400
> >
> > +config BMA400_SPI
> > + tristate
> > + depends on BMA400
> > +
> > config BMC150_ACCEL
> > tristate "Bosch BMC150 Accelerometer Driver"
> > select IIO_BUFFER
> > diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> > index 3a051cf37f40..4f6c1ebe13b0 100644
> > --- a/drivers/iio/accel/Makefile
> > +++ b/drivers/iio/accel/Makefile
> > @@ -16,6 +16,7 @@ obj-$(CONFIG_BMA180) += bma180.o
> > obj-$(CONFIG_BMA220) += bma220_spi.o
> > obj-$(CONFIG_BMA400) += bma400_core.o
> > obj-$(CONFIG_BMA400_I2C) += bma400_i2c.o
> > +obj-$(CONFIG_BMA400_SPI) += bma400_spi.o
> > obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
> > obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
> > obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
> > diff --git a/drivers/iio/accel/bma400_spi.c b/drivers/iio/accel/bma400_spi.c
> > new file mode 100644
> > index 000000000000..7c2825904e08
> > --- /dev/null
> > +++ b/drivers/iio/accel/bma400_spi.c
> > @@ -0,0 +1,120 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * SPI IIO driver for Bosch BMA400 triaxial acceleration sensor.
> > + *
> > + * Copyright 2020 Dan Robertson <dan@dlrobertson.com>
> > + *
> > + */
> > +#include <linux/bits.h>
> > +#include <linux/init.h>
> > +#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#include "bma400.h"
> > +
> > +#define BMA400_MAX_SPI_READ 2
> > +#define BMA400_SPI_READ_BUFFER_SIZE (BMA400_MAX_SPI_READ + 1)
> > +
> > +static int bma400_regmap_spi_read(void *context,
> > + const void *reg, size_t reg_size,
> > + void *val, size_t val_size)
> > +{
> > + struct device *dev = context;
> > + struct spi_device *spi = to_spi_device(dev);
> > + u8 result[BMA400_SPI_READ_BUFFER_SIZE];
> > + ssize_t status;
> > +
> > + if (val_size > BMA400_MAX_SPI_READ)
> > + return -EINVAL;
> > +
> > + status = spi_write_then_read(spi, reg, 1, result, val_size + 1);
>
> There is a double memcpy going on here. spi_write_then_read is using it's
> own internal buffers which we then copy into result and then recopy
> below into val.
>
> How about we cheat and pad the write side by one extra byte of 0s?
> That way we can pass val in directly for the read and only copy this buffer
> once.
>
> It will only help in cases where we are reading more than one byte (as
> still involves a copy) but I think the bma400 core does some bulk reads.
I took a another quick look. The bulk read is tiny (2 bytes) so let's
leave this as is. If we later add larger reads we may want to revisit
however.
>
>
> > + if (status)
> > + return status;
> > +
> > + /*
> > + * From the BMA400 datasheet:
> > + *
> > + * > For a basic read operation two bytes have to be read and the first
> > + * > has to be dropped and the second byte must be interpreted.
> > + */
> > + memcpy(val, result + 1, val_size);
> > +
> > + return 0;
> > +}
> > +
> > +static int bma400_regmap_spi_write(void *context, const void *data,
> > + size_t count)
> > +{
> > + struct device *dev = context;
> > + struct spi_device *spi = to_spi_device(dev);
> > +
> > + return spi_write(spi, data, count);
> > +}
> > +
> > +static struct regmap_bus bma400_regmap_bus = {
> > + .read = bma400_regmap_spi_read,
> > + .write = bma400_regmap_spi_write,
> > + .read_flag_mask = BIT(7),
> > + .max_raw_read = BMA400_MAX_SPI_READ,
> > +};
> > +
> > +static int bma400_spi_probe(struct spi_device *spi)
> > +{
> > + const struct spi_device_id *id = spi_get_device_id(spi);
> > + struct regmap *regmap;
> > + unsigned int val;
> > + int ret;
> > +
> > + regmap = devm_regmap_init(&spi->dev, &bma400_regmap_bus,
> > + &spi->dev, &bma400_regmap_config);
> > + if (IS_ERR(regmap)) {
> > + dev_err(&spi->dev, "failed to create regmap\n");
> > + return PTR_ERR(regmap);
> > + }
> > +
> > + /*
> > + * Per the bma400 datasheet, the first SPI read may
> > + * return garbage. As the datasheet recommends, the
> > + * chip ID register will be read here and checked
> > + * again in the following probe.
> > + */
> > + ret = regmap_read(regmap, BMA400_CHIP_ID_REG, &val);
> > + if (ret)
> > + dev_err(&spi->dev, "Failed to read chip id register\n");
> > +
> > + return bma400_probe(&spi->dev, regmap, id->name);
> > +}
> > +
> > +static int bma400_spi_remove(struct spi_device *spi)
> > +{
> > + return bma400_remove(&spi->dev);
> > +}
> > +
> > +static const struct spi_device_id bma400_spi_ids[] = {
> > + { "bma400", 0 },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(spi, bma400_spi_ids);
> > +
> > +static const struct of_device_id bma400_of_spi_match[] = {
> > + { .compatible = "bosch,bma400" },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(of, bma400_of_spi_match);
> > +
> > +static struct spi_driver bma400_spi_driver = {
> > + .driver = {
> > + .name = "bma400",
> > + .of_match_table = bma400_of_spi_match,
> > + },
> > + .probe = bma400_spi_probe,
> > + .remove = bma400_spi_remove,
> > + .id_table = bma400_spi_ids,
> > +};
> > +
> > +module_spi_driver(bma400_spi_driver);
> > +MODULE_AUTHOR("Dan Robertson <dan@dlrobertson.com>");
> > +MODULE_DESCRIPTION("Bosch BMA400 triaxial acceleration sensor (SPI)");
> > +MODULE_LICENSE("GPL");
> >
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/1] iio: accel: bma400: add support for bma400 spi
2020-05-31 9:14 ` Jonathan Cameron
@ 2020-06-02 2:46 ` Dan Robertson
0 siblings, 0 replies; 5+ messages in thread
From: Dan Robertson @ 2020-06-02 2:46 UTC (permalink / raw)
To: Jonathan Cameron
Cc: Hartmut Knaack, Lars-Peter Clausen, Peter Meerwald-Stadler,
Linus Walleij, Andy Shevchenko, linux-iio
[-- Attachment #1: Type: text/plain, Size: 1093 bytes --]
On Sun, May 31, 2020 at 10:14:06AM +0100, Jonathan Cameron wrote:
> On Sun, 31 May 2020 10:10:24 +0100
> Jonathan Cameron <jic23@kernel.org> wrote:
>
> > On Sat, 30 May 2020 19:10:10 +0000
> > Dan Robertson <dan@dlrobertson.com> wrote:
> >
> > > Add basic support for the Bosch Sensortec BMA400 3-axes ultra-low power
> > > accelerometer when configured to use SPI.
> > >
> > > Signed-off-by: Dan Robertson <dan@dlrobertson.com>
> >
> > Hi Dan.
> >
> > Code looks good, but one suggestion for a possible optimization inline.
> >
> > I did wonder if it would be possible to use standard spi regmap to
> > do this, but it seems there is only a single pad parameter for both
> > reads and writes so that won't work.
>
> Changed my mind. See below.
Yeah I had hoped for the same too.
> Applied to the togreg branch of iio.git and pushed out as testing for
> the autobuilders to play with it.
Thanks!
> Note however that we should add spi stuff to the device tree binding
> docs. That can happen as a follow up patch.
Will do.
Cheers,
- Dan
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 902 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-06-02 2:47 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-30 19:10 [PATCH v2 0/1] iio: accel: bma400: add support for bma400 spi Dan Robertson
2020-05-30 19:10 ` [PATCH v2 1/1] " Dan Robertson
2020-05-31 9:10 ` Jonathan Cameron
2020-05-31 9:14 ` Jonathan Cameron
2020-06-02 2:46 ` Dan Robertson
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).