plat/stm32mp1: fdt helpers for secure aware gpio bank
New helper functions to get GPIO banks configuration from the FDT.
stm32_get_gpio_bank_pinctrl_node() allows stm32mp platforms to
differentiate specific GPIO banks when these are defined with a specific
path in the FDT.
fdt_get_gpio_bank_pin_count() returns the number of pins in a GPIO bank
as it depends on the SoC variant.
Change-Id: I4481774152b3c6bf35bf986f58e357c2f9c19176
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
diff --git a/plat/st/common/include/stm32mp_common.h b/plat/st/common/include/stm32mp_common.h
index 27ddab0..feeb4a7 100644
--- a/plat/st/common/include/stm32mp_common.h
+++ b/plat/st/common/include/stm32mp_common.h
@@ -61,6 +61,9 @@
unsigned long stm32_get_gpio_bank_clock(unsigned int bank);
uint32_t stm32_get_gpio_bank_offset(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);
+
/* Print CPU information */
void stm32mp_print_cpuinfo(void);
diff --git a/plat/st/common/include/stm32mp_dt.h b/plat/st/common/include/stm32mp_dt.h
index e79551a..44ad820 100644
--- a/plat/st/common/include/stm32mp_dt.h
+++ b/plat/st/common/include/stm32mp_dt.h
@@ -1,4 +1,5 @@
/*
+ * Copyright (c) 2020, STMicroelectronics - All Rights Reserved
* Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
@@ -39,5 +40,6 @@
uint32_t dt_get_pwr_vdd_voltage(void);
uintptr_t dt_get_syscfg_base(void);
const char *dt_get_board_model(void);
+int fdt_get_gpio_bank_pin_count(unsigned int bank);
#endif /* STM32MP_DT_H */
diff --git a/plat/st/common/stm32mp_dt.c b/plat/st/common/stm32mp_dt.c
index 155f784..4b8b2db 100644
--- a/plat/st/common/stm32mp_dt.c
+++ b/plat/st/common/stm32mp_dt.c
@@ -393,3 +393,51 @@
return (const char *)fdt_getprop(fdt, node, "model", NULL);
}
+
+/*******************************************************************************
+ * This function gets the pin count for a GPIO bank based from the FDT.
+ * It also checks node consistency.
+ ******************************************************************************/
+int fdt_get_gpio_bank_pin_count(unsigned int bank)
+{
+ int pinctrl_node;
+ int node;
+ uint32_t bank_offset;
+
+ pinctrl_node = stm32_get_gpio_bank_pinctrl_node(fdt, bank);
+ if (pinctrl_node < 0) {
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ bank_offset = stm32_get_gpio_bank_offset(bank);
+
+ fdt_for_each_subnode(node, fdt, pinctrl_node) {
+ const fdt32_t *cuint;
+
+ if (fdt_getprop(fdt, node, "gpio-controller", NULL) == NULL) {
+ continue;
+ }
+
+ cuint = fdt_getprop(fdt, node, "reg", NULL);
+ if (cuint == NULL) {
+ continue;
+ }
+
+ if (fdt32_to_cpu(*cuint) != bank_offset) {
+ continue;
+ }
+
+ if (fdt_get_status(node) == DT_DISABLED) {
+ return 0;
+ }
+
+ cuint = fdt_getprop(fdt, node, "ngpios", NULL);
+ if (cuint == NULL) {
+ return -FDT_ERR_NOTFOUND;
+ }
+
+ return (int)fdt32_to_cpu(*cuint);
+ }
+
+ return 0;
+}