From ca30c1db697b56a5fc2d90137e93c5876123d9d1 Mon Sep 17 00:00:00 2001
From: Gustavo Henrique Nihei <gustavo.nihei@espressif.com>
Date: Mon, 22 Feb 2021 10:25:15 -0300
Subject: [PATCH] risc-v/esp32c3: Build serial driver only when selected

---
 arch/risc-v/src/esp32c3/Kconfig   | 6 ++++++
 arch/risc-v/src/esp32c3/Make.defs | 6 +++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/risc-v/src/esp32c3/Kconfig b/arch/risc-v/src/esp32c3/Kconfig
index 6fc67ab34f7..d1f0e5c8919 100644
--- a/arch/risc-v/src/esp32c3/Kconfig
+++ b/arch/risc-v/src/esp32c3/Kconfig
@@ -104,6 +104,10 @@ config ESP32C3_CPU_FREQ_MHZ
 
 menu "ESP32-C3 Peripheral Support"
 
+config ESP32C3_UART
+	bool
+	default n
+
 config ESP32C3_WDT
 	bool
 	default n
@@ -116,11 +120,13 @@ config ESP32C3_GPIO_IRQ
 config ESP32C3_UART0
 	bool "UART0"
 	default y
+	select ESP32C3_UART
 	select UART0_SERIALDRIVER
 
 config ESP32C3_UART1
 	bool "UART1"
 	default n
+	select ESP32C3_UART
 	select UART1_SERIALDRIVER
 
 config ESP32C3_MWDT0
diff --git a/arch/risc-v/src/esp32c3/Make.defs b/arch/risc-v/src/esp32c3/Make.defs
index 331db55109b..8bdbb956413 100644
--- a/arch/risc-v/src/esp32c3/Make.defs
+++ b/arch/risc-v/src/esp32c3/Make.defs
@@ -52,7 +52,11 @@ endif
 CHIP_CSRCS  = esp32c3_allocateheap.c esp32c3_start.c esp32c3_idle.c
 CHIP_CSRCS += esp32c3_irq.c esp32c3_timerisr.c
 CHIP_CSRCS += esp32c3_clockconfig.c esp32c3_gpio.c
-CHIP_CSRCS += esp32c3_serial.c esp32c3_lowputc.c
+CHIP_CSRCS += esp32c3_lowputc.c
+
+ifeq ($(CONFIG_ESP32C3_UART),y)
+CHIP_CSRCS += esp32c3_serial.c
+endif
 
 ifeq ($(CONFIG_ESP32C3_WDT),y)
 CHIP_CSRCS += esp32c3_wdt.c