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feat(stm32_gpio): add a function to reset a pin 

Add set_gpio_reset_cfg() to set a pin in its reset configuration:
analog, no-pull, speed low, and its secure configuration, thanks to
stm32_gpio_is_secure_at_reset().

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: I7b73c3636859f97fcc57f81cf68b42efc727922e
This commit is contained in:
Yann Gautier 2021-06-11 10:54:56 +02:00 committed by Yann Gautier
parent ce21ee89d4
commit 737ad29bf9
4 changed files with 20 additions and 2 deletions
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9
drivers/st/gpio/stm32_gpio.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2016-2020, STMicroelectronics - All Rights Reserved
* Copyright (c) 2016-2021, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -283,3 +283,10 @@ void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure)
stm32mp_clk_disable(clock);
}
void set_gpio_reset_cfg(uint32_t bank, uint32_t pin)
{
set_gpio(bank, pin, GPIO_MODE_ANALOG, GPIO_SPEED_LOW,
GPIO_NO_PULL, GPIO_ALTERNATE_(0), DT_DISABLED);
set_gpio_secure_cfg(bank, pin, stm32_gpio_is_secure_at_reset(bank));
}

3
include/drivers/st/stm32_gpio.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015-2019, STMicroelectronics - All Rights Reserved
* Copyright (c) 2015-2021, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -52,6 +52,7 @@ int dt_set_pinctrl_config(int node);
void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t speed,
uint32_t pull, uint32_t alternate, uint8_t status);
void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure);
void set_gpio_reset_cfg(uint32_t bank, uint32_t pin);
#endif /*__ASSEMBLER__*/
#endif /* STM32_GPIO_H */

1
plat/st/common/include/stm32mp_common.h
View File

@ -69,6 +69,7 @@ uintptr_t get_uart_address(uint32_t instance_nb);
uintptr_t stm32_get_gpio_bank_base(unsigned int bank);
unsigned long stm32_get_gpio_bank_clock(unsigned int bank);
uint32_t stm32_get_gpio_bank_offset(unsigned int bank);
bool stm32_gpio_is_secure_at_reset(unsigned int bank);
/* Return node offset for target GPIO bank ID @bank or a FDT error code */
int stm32_get_gpio_bank_pinctrl_node(void *fdt, unsigned int bank);

9
plat/st/stm32mp1/stm32mp1_private.c
View File

@ -120,6 +120,15 @@ uint32_t stm32_get_gpio_bank_offset(unsigned int bank)
return bank * GPIO_BANK_OFFSET;
}
bool stm32_gpio_is_secure_at_reset(unsigned int bank)
{
if (bank == GPIO_BANK_Z) {
return true;
}
return false;
}
unsigned long stm32_get_gpio_bank_clock(unsigned int bank)
{
if (bank == GPIO_BANK_Z) {