From: Julian Braha <julianbraha@gmail.com>
To: gregkh@linuxfoundation.org, jcmvbkbc@gmail.com
Cc: rdunlap@infradead.org, ilpo.jarvinen@linux.intel.com,
conor+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org,
robh+dt@kernel.org, jirislaby@kernel.org,
linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Julian Braha <julianbraha@gmail.com>
Subject: [PATCH] drivers/tty/serial: move ESP32 UART drivers into staging
Date: Sun, 8 Mar 2026 13:14:12 +0000 [thread overview]
Message-ID: <20260308131412.1102749-1-julianbraha@gmail.com> (raw)
These drivers were added about 3 years ago, and depend on the
XTENSA_PLATFORM_ESP32 config option which has never existed,
so no device can actually use them.
They can only be compiled with COMPILE_TEST.
As you can see, this config option is still undefined
in the downstream tree:
https://github.com/search?q=repo%3Ajcmvbkbc%2Flinux-xtensa%20XTENSA_PLATFORM_ESP32&type=code
I propose moving these drivers into staging
until there is a device that can boot the mainline kernel and use them.
Signed-off-by: Julian Braha <julianbraha@gmail.com>
---
drivers/staging/Kconfig | 2 ++
drivers/staging/Makefile | 1 +
drivers/staging/serial_esp32/Kconfig | 28 +++++++++++++++++++
drivers/staging/serial_esp32/Makefile | 4 +++
.../serial_esp32}/esp32_acm.c | 0
.../serial_esp32}/esp32_uart.c | 0
drivers/tty/serial/Kconfig | 26 -----------------
drivers/tty/serial/Makefile | 2 --
8 files changed, 35 insertions(+), 28 deletions(-)
create mode 100644 drivers/staging/serial_esp32/Kconfig
create mode 100644 drivers/staging/serial_esp32/Makefile
rename drivers/{tty/serial => staging/serial_esp32}/esp32_acm.c (100%)
rename drivers/{tty/serial => staging/serial_esp32}/esp32_uart.c (100%)
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 2f92cd698bef..97593e31ca47 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -48,4 +48,6 @@ source "drivers/staging/axis-fifo/Kconfig"
source "drivers/staging/vme_user/Kconfig"
+source "drivers/staging/serial_esp32/Kconfig"
+
endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index f5b8876aa536..78c2e4f49fe5 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -2,6 +2,7 @@
# Makefile for staging directory
obj-y += media/
+obj-y += serial_esp32/
obj-$(CONFIG_RTL8723BS) += rtl8723bs/
obj-$(CONFIG_OCTEON_ETHERNET) += octeon/
obj-$(CONFIG_VME_BUS) += vme_user/
diff --git a/drivers/staging/serial_esp32/Kconfig b/drivers/staging/serial_esp32/Kconfig
new file mode 100644
index 000000000000..61c56bfe7764
--- /dev/null
+++ b/drivers/staging/serial_esp32/Kconfig
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+config SERIAL_ESP32
+ tristate "Espressif ESP32 UART support"
+ depends on HAS_IOMEM
+ depends on XTENSA_PLATFORM_ESP32 || (COMPILE_TEST && OF)
+ select SERIAL_CORE
+ select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
+ help
+ Driver for the UART controllers of the Espressif ESP32xx SoCs.
+ When earlycon option is enabled the following kernel command line
+ snippets may be used:
+ earlycon=esp32s3uart,mmio32,0x60000000,115200n8,40000000
+ earlycon=esp32uart,mmio32,0x3ff40000,115200n8
+
+config SERIAL_ESP32_ACM
+ tristate "Espressif ESP32 USB ACM gadget support"
+ depends on HAS_IOMEM
+ depends on XTENSA_PLATFORM_ESP32 || (COMPILE_TEST && OF)
+ select SERIAL_CORE
+ select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
+ help
+ Driver for the CDC ACM gadget controller of the Espressif ESP32S3
+ SoCs that share separate USB controller with the JTAG adapter.
+ When earlycon option is enabled the following kernel command line
+ snippet may be used:
+ earlycon=esp32s3acm,mmio32,0x60038000
diff --git a/drivers/staging/serial_esp32/Makefile b/drivers/staging/serial_esp32/Makefile
new file mode 100644
index 000000000000..3c23321944e2
--- /dev/null
+++ b/drivers/staging/serial_esp32/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_SERIAL_ESP32) += esp32_uart.o
+obj-$(CONFIG_SERIAL_ESP32_ACM) += esp32_acm.o
diff --git a/drivers/tty/serial/esp32_acm.c b/drivers/staging/serial_esp32/esp32_acm.c
similarity index 100%
rename from drivers/tty/serial/esp32_acm.c
rename to drivers/staging/serial_esp32/esp32_acm.c
diff --git a/drivers/tty/serial/esp32_uart.c b/drivers/staging/serial_esp32/esp32_uart.c
similarity index 100%
rename from drivers/tty/serial/esp32_uart.c
rename to drivers/staging/serial_esp32/esp32_uart.c
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index f86775cfdcc9..686e7fb073b8 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1593,32 +1593,6 @@ config SERIAL_NUVOTON_MA35D1_CONSOLE
but you can alter that using a kernel command line option such as
"console=ttyNVTx".
-config SERIAL_ESP32
- tristate "Espressif ESP32 UART support"
- depends on XTENSA_PLATFORM_ESP32 || (COMPILE_TEST && OF)
- select SERIAL_CORE
- select SERIAL_CORE_CONSOLE
- select SERIAL_EARLYCON
- help
- Driver for the UART controllers of the Espressif ESP32xx SoCs.
- When earlycon option is enabled the following kernel command line
- snippets may be used:
- earlycon=esp32s3uart,mmio32,0x60000000,115200n8,40000000
- earlycon=esp32uart,mmio32,0x3ff40000,115200n8
-
-config SERIAL_ESP32_ACM
- tristate "Espressif ESP32 USB ACM gadget support"
- depends on XTENSA_PLATFORM_ESP32 || (COMPILE_TEST && OF)
- select SERIAL_CORE
- select SERIAL_CORE_CONSOLE
- select SERIAL_EARLYCON
- help
- Driver for the CDC ACM gadget controller of the Espressif ESP32S3
- SoCs that share separate USB controller with the JTAG adapter.
- When earlycon option is enabled the following kernel command line
- snippet may be used:
- earlycon=esp32s3acm,mmio32,0x60038000
-
endmenu
config SERIAL_MCTRL_GPIO
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index a2ccbc508ec5..bba7b21a4a1d 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -37,8 +37,6 @@ obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
obj-$(CONFIG_SERIAL_CPM) += cpm_uart.o
obj-$(CONFIG_SERIAL_CONEXANT_DIGICOLOR) += digicolor-usart.o
obj-$(CONFIG_SERIAL_DZ) += dz.o
-obj-$(CONFIG_SERIAL_ESP32) += esp32_uart.o
-obj-$(CONFIG_SERIAL_ESP32_ACM) += esp32_acm.o
obj-$(CONFIG_SERIAL_FSL_LINFLEXUART) += fsl_linflexuart.o
obj-$(CONFIG_SERIAL_FSL_LPUART) += fsl_lpuart.o
obj-$(CONFIG_SERIAL_ICOM) += icom.o
--
2.51.2
next reply other threads:[~2026-03-08 13:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-08 13:14 Julian Braha [this message]
2026-03-08 14:16 ` [PATCH] drivers/tty/serial: move ESP32 UART drivers into staging Greg KH
2026-03-09 7:44 ` Max Filippov
-- strict thread matches above, loose matches on Subject: below --
2026-03-08 13:11 Julian Braha
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