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drivers: clock_control: Add STM32 clock multiplexer driver

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Add a clock multiplexer driver.
Its only function is to select a clock input.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
This commit is contained in:
Erwan Gouriou 2022-02-04 11:50:49 +01:00 • committed by Carles Cufí
commit d71b89b398
3 changed files with 60 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

1
drivers/clock_control/CMakeLists.txt
View file

@ -21,6 +21,7 @@ zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_RCAR_CPG_MSSR clock_cont
zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_RV32M1_PCC clock_control_rv32m1_pcc.c) zephyr_library_sources_ifdef(CONFIG_CLOCK_CONTROL_RV32M1_PCC clock_control_rv32m1_pcc.c)
if(CONFIG_CLOCK_CONTROL_STM32_CUBE) if(CONFIG_CLOCK_CONTROL_STM32_CUBE)
zephyr_library_sources_ifdef(CONFIG_CLOCK_STM32_MUX clock_stm32_mux.c)
if(CONFIG_SOC_SERIES_STM32MP1X) if(CONFIG_SOC_SERIES_STM32MP1X)
zephyr_library_sources(clock_stm32_ll_mp1.c) zephyr_library_sources(clock_stm32_ll_mp1.c)
elseif(CONFIG_SOC_SERIES_STM32H7X) elseif(CONFIG_SOC_SERIES_STM32H7X)

12
drivers/clock_control/Kconfig.stm32
View file

@ -8,7 +8,7 @@ menuconfig CLOCK_CONTROL_STM32_CUBE
bool "STM32 Reset & Clock Control" bool "STM32 Reset & Clock Control"
depends on SOC_FAMILY_STM32 depends on SOC_FAMILY_STM32
select USE_STM32_LL_UTILS select USE_STM32_LL_UTILS
select USE_STM32_LL_RCC if SOC_SERIES_STM32MP1X select USE_STM32_LL_RCC if (SOC_SERIES_STM32MP1X || SOC_SERIES_STM32H7X)
help help
Enable driver for Reset & Clock Control subsystem found Enable driver for Reset & Clock Control subsystem found
in STM32 family of MCUs in STM32 family of MCUs
@ -17,6 +17,7 @@ if CLOCK_CONTROL_STM32_CUBE
DT_STM32_HSE_CLOCK := $(dt_nodelabel_path,clk_hse) DT_STM32_HSE_CLOCK := $(dt_nodelabel_path,clk_hse)
DT_STM32_HSE_CLOCK_FREQ := $(dt_node_int_prop_int,$(DT_STM32_HSE_CLOCK),clock-frequency) DT_STM32_HSE_CLOCK_FREQ := $(dt_node_int_prop_int,$(DT_STM32_HSE_CLOCK),clock-frequency)
DT_COMPAT_ST_MUX_CLOCK := st,stm32-clock-mux
config CLOCK_STM32_HSE_CLOCK config CLOCK_STM32_HSE_CLOCK
int "HSE clock value" int "HSE clock value"
@ -33,6 +34,15 @@ config CLOCK_STM32_HSE_CLOCK
Note: Device tree configuration is overridden when current symbol is set: Note: Device tree configuration is overridden when current symbol is set:
CONFIG_CLOCK_STM32_HSE_CLOCK=32000000 CONFIG_CLOCK_STM32_HSE_CLOCK=32000000
config CLOCK_STM32_MUX
bool "STM32 clock mux driver"
default $(dt_compat_enabled,$(DT_COMPAT_ST_MUX_CLOCK))
help
Enable driver for STM32 clock mux which don't match an
existing clock hardware block but allows to select a clock
for a specific domain. For instance per_ck clock on STM32H7 or
CLK48 clock
# Micro-controller Clock output configuration options # Micro-controller Clock output configuration options
choice choice

48
drivers/clock_control/clock_stm32_mux.c Normal file
View file

@ -0,0 +1,48 @@
/*
* SPDX-License-Identifier: Apache-2.0
*
* Copyright (C) 2022, Linaro Ltd
*
*/
#include <drivers/clock_control.h>
#include <sys/util.h>
#include <drivers/clock_control/stm32_clock_control.h>
#include <logging/log.h>
#include <soc.h>
#define DT_DRV_COMPAT st_stm32_clock_mux
LOG_MODULE_REGISTER(clock_mux, CONFIG_CLOCK_CONTROL_LOG_LEVEL);
struct stm32_clk_mux_config {
const struct stm32_pclken pclken;
};
static int stm32_clk_mux_init(const struct device *dev)
{
const struct stm32_clk_mux_config *cfg = dev->config;
if (clock_control_on(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
(clock_control_subsys_t) &cfg->pclken) != 0) {
LOG_ERR("Could not enable clock mux");
return -EIO;
}
return 0;
}
#define STM32_MUX_CLK_INIT(id) \
\
static const struct stm32_clk_mux_config stm32_clk_mux_cfg_##id = { \
.pclken = STM32_INST_CLOCK_INFO(id, 0) \
}; \
\
DEVICE_DT_INST_DEFINE(id, &stm32_clk_mux_init, NULL, \
NULL, &stm32_clk_mux_cfg_##id, \
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS,\
NULL);
DT_INST_FOREACH_STATUS_OKAY(STM32_MUX_CLK_INIT)