u-boot.git/drivers/serial, branch v2026.04-rc2

serial: atmel-usart: add support for skiping debug UART init

2026-02-04T12:12:56Z

Currently, atmel-usart does not respect CONFIG_DEBUG_UART_SKIP_INIT so it will always configure the debug UART. However, this is unwanted on platforms on which TF-A or some other firmware has already configured the debug UART. This will be used for Microchip LAN969x support, so simply return early if CONFIG_DEBUG_UART_SKIP_INIT is set. Signed-off-by: Robert Marko

serial: atmel-usart: include arch specific headers only for AT91

2026-02-04T12:12:56Z

Microchip LAN969x will not include any arch specific clk.h nor hardware.h, so in order to support it only include and when AT91 is selected. Signed-off-by: Robert Marko

arm: at91: move atmel_serial.h to include/dm/platform_data

2026-02-04T12:12:56Z

Move the arch specific atmel_serial.h header from AT91 to the generic include/dm/platform_data. This will be used for support on Microchip LAN969x. Signed-off-by: Robert Marko

serial: Add Goldfish TTY driver

2026-02-02T20:24:40Z

Add support for the Google Goldfish TTY serial device. This virtual device is commonly used in QEMU virtual machines (such as the m68k virt machine) and Android emulators. The driver implements basic console output and input polling using the Goldfish MMIO interface. Signed-off-by: Kuan-Wei Chiu Reviewed-by: Yao Zi Tested-by: Daniel Palmer Acked-by: Heinrich Schuchardt Reviewed-by: Simon Glass Acked-by: Angelo Dureghello

serial: serial_meson: add minimal non-DM driver

2025-12-11T10:44:41Z

It is very limited and minimal, only implements putc/puts. This minimal driver is intended to be used in SPL, and other size-constrained situations. Reviewed-by: Neil Armstrong Signed-off-by: Ferass El Hafidi Link: https://patch.msgid.link/20251126-spl-gx-v5-3-6cbffb2451ca@postmarketos.org Signed-off-by: Neil Armstrong

serial: s5p: add compatible for exynos8895

2025-11-12T04:58:36Z

Add the compatible for Exynos8895 UART as described in upstream devicetree bindings. This enables support for Exynos8895 and other similar UART devices, such as Exynos7870. Other than that, the driver works as-is. Signed-off-by: Kaustabh Chakraborty Reviewed-by: Henrik Grimler Signed-off-by: Minkyu Kang

serial: make VPL_DM_SERIAL depend on VPL_DM

2025-11-06T23:33:31Z

I have a hunch VPL_DM_SERIAL should not be selectable if VPL isn't set as implied by the prefix. Additionally, still based on the prefix, I'm assuming VPL_DM should be a dependency. Since VPL_DM can only be selectable when VPL is enabled, only depend on VPL_DM. This mirrors SPL_DM_SERIAL and TPL_DM_SERIAL so seems right to me. Signed-off-by: Quentin Schulz Reviewed-by: Tom Rini Reviewed-by: Simon Glass

serial: msm-geni: implement firmware loading

2025-10-30T17:04:51Z

Teach the GENI UART driver to load firmware, similar to i2c. This is primarily intended for non-debug UARTs, but since we don't support using these as the console we abort probe for now. Remove duplicated register macros that are in the common geni-se header. Signed-off-by: Casey Connolly Link: https://patch.msgid.link/20250714-geni-load-fw-v5-7-5abbc0d29838@linaro.org Signed-off-by: Casey Connolly

serial: msm-geni: Enable SE clk in probe

2025-10-30T17:04:51Z

Enable the serial engine clk in probe so that this driver can work on platforms that don't already initialize the clk for this device before this driver runs. This fixes a problem I see on Coreboot platforms like Trogdor where the UART hardware isn't enabled by coreboot unless the serial console build is used. Signed-off-by: Stephen Boyd Link: https://patch.msgid.link/20250714-geni-load-fw-v5-6-5abbc0d29838@linaro.org Signed-off-by: Casey Connolly

misc: introduce Qcom GENI wrapper

2025-10-30T17:04:51Z

Qualcomm peripherals like UART, SPI, I2C, etc are all exposed under a common GENI Serial Engine wrapper device. Replace the stub driver we use for this currently with a full-on misc device and implement support for loading peripheral firmware. Each of the peripherals has it's own protocol-specific firmware, this is stored on the internal storage of the device with a well-known partition type GUID. To support this, GENI will bind peripherals in two stages. First the ones that already have firmware loaded (such as the serial port) are bound in the typical way. But devices that require firmware loading are deferred until EVT_LAST_STAGE_INIT. At this point we can be sure that the storage device is available, so we load the firmware and then bind and probe the remaining children. Child devices are expected to determine if firmware loading is necessary and call qcom_geni_load_firmware(). Since Linux currently doesn't support loading firmware (and firmware may not be available), we probe all GENI peripherals to ensure that they always load firmware if necessary. Signed-off-by: Casey Connolly Link: https://patch.msgid.link/20250714-geni-load-fw-v5-3-5abbc0d29838@linaro.org Signed-off-by: Casey Connolly