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| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2017-04-10 17:49:50 +0200 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-04-14 16:36:16 +0100 |
| commit | 4d4b30526eb88c4528ddfa8c113961c1ac178479 (patch) | |
| tree | eb212f4d39643823e2d757387799b34e8fa84d32 /drivers/iio/dac/stm32-dac-core.h | |
| parent | 48428d17325291f5be8c0420efca7e312587d9ad (diff) | |
| download | linux-4d4b30526eb88c4528ddfa8c113961c1ac178479.tar.bz2 | |
iio: dac: add support for stm32 DAC
Add support for STMicroelectronics STM32 DAC. It's a 12-bit, voltage
output digital-to-analog converter. It has two output channels, each
with its own converter.
It supports 8 bits or 12bits left/right aligned data format. Only
12bits right-aligned is used here. It has built-in noise or
triangle waveform generator, and supports external triggers for
conversions.
Each channel can be used independently, with separate trigger, then
separate IIO devices are used to handle this. Core driver is intended
to share common resources such as clock, reset, reference voltage and
registers.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/dac/stm32-dac-core.h')
| -rw-r--r-- | drivers/iio/dac/stm32-dac-core.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/iio/dac/stm32-dac-core.h b/drivers/iio/dac/stm32-dac-core.h new file mode 100644 index 000000000000..daf09931857c --- /dev/null +++ b/drivers/iio/dac/stm32-dac-core.h @@ -0,0 +1,51 @@ +/* + * This file is part of STM32 DAC driver + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author: Fabrice Gasnier <fabrice.gasnier@st.com>. + * + * License type: GPLv2 + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __STM32_DAC_CORE_H +#define __STM32_DAC_CORE_H + +#include <linux/regmap.h> + +/* STM32 DAC registers */ +#define STM32_DAC_CR 0x00 +#define STM32_DAC_DHR12R1 0x08 +#define STM32_DAC_DHR12R2 0x14 +#define STM32_DAC_DOR1 0x2C +#define STM32_DAC_DOR2 0x30 + +/* STM32_DAC_CR bit fields */ +#define STM32_DAC_CR_EN1 BIT(0) +#define STM32H7_DAC_CR_HFSEL BIT(15) +#define STM32_DAC_CR_EN2 BIT(16) + +/** + * struct stm32_dac_common - stm32 DAC driver common data (for all instances) + * @regmap: DAC registers shared via regmap + * @vref_mv: reference voltage (mv) + * @hfsel: high speed bus clock selected + */ +struct stm32_dac_common { + struct regmap *regmap; + int vref_mv; + bool hfsel; +}; + +#endif |