mfd: Add STM32 LPTimer driver
STM32 Low-Power Timer hardware block can be used for:
- PWM generation
- IIO trigger (in sync with PWM)
- IIO quadrature encoder counter
PWM and IIO timer configuration are mixed in the same registers so
we need a multi fonction driver to be able to share those registers.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/include/linux/mfd/stm32-lptimer.h b/include/linux/mfd/stm32-lptimer.h
new file mode 100644
index 0000000..77c7cf4
--- /dev/null
+++ b/include/linux/mfd/stm32-lptimer.h
@@ -0,0 +1,62 @@
+/*
+ * STM32 Low-Power Timer parent driver.
+ *
+ * Copyright (C) STMicroelectronics 2017
+ *
+ * Author: Fabrice Gasnier <fabrice.gasnier@st.com>
+ *
+ * Inspired by Benjamin Gaignard's stm32-timers driver
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#ifndef _LINUX_STM32_LPTIMER_H_
+#define _LINUX_STM32_LPTIMER_H_
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+
+#define STM32_LPTIM_ISR 0x00 /* Interrupt and Status Reg */
+#define STM32_LPTIM_ICR 0x04 /* Interrupt Clear Reg */
+#define STM32_LPTIM_IER 0x08 /* Interrupt Enable Reg */
+#define STM32_LPTIM_CFGR 0x0C /* Configuration Reg */
+#define STM32_LPTIM_CR 0x10 /* Control Reg */
+#define STM32_LPTIM_CMP 0x14 /* Compare Reg */
+#define STM32_LPTIM_ARR 0x18 /* Autoreload Reg */
+#define STM32_LPTIM_CNT 0x1C /* Counter Reg */
+
+/* STM32_LPTIM_ISR - bit fields */
+#define STM32_LPTIM_CMPOK_ARROK GENMASK(4, 3)
+#define STM32_LPTIM_ARROK BIT(4)
+#define STM32_LPTIM_CMPOK BIT(3)
+
+/* STM32_LPTIM_ICR - bit fields */
+#define STM32_LPTIM_CMPOKCF_ARROKCF GENMASK(4, 3)
+
+/* STM32_LPTIM_CR - bit fields */
+#define STM32_LPTIM_CNTSTRT BIT(2)
+#define STM32_LPTIM_ENABLE BIT(0)
+
+/* STM32_LPTIM_CFGR - bit fields */
+#define STM32_LPTIM_ENC BIT(24)
+#define STM32_LPTIM_COUNTMODE BIT(23)
+#define STM32_LPTIM_WAVPOL BIT(21)
+#define STM32_LPTIM_PRESC GENMASK(11, 9)
+#define STM32_LPTIM_CKPOL GENMASK(2, 1)
+
+/* STM32_LPTIM_ARR */
+#define STM32_LPTIM_MAX_ARR 0xFFFF
+
+/**
+ * struct stm32_lptimer - STM32 Low-Power Timer data assigned by parent device
+ * @clk: clock reference for this instance
+ * @regmap: register map reference for this instance
+ * @has_encoder: indicates this Low-Power Timer supports encoder mode
+ */
+struct stm32_lptimer {
+ struct clk *clk;
+ struct regmap *regmap;
+ bool has_encoder;
+};
+
+#endif