kernel/drivers/tty/serial/samsung_tty.c, branch 0x221E-v0.0.1-v6.19

tty: serial: samsung: Declare earlycon for Exynos850

2025-11-26T12:11:55Z

It makes it possible to use just "earlycon" param in kernel cmdline on Exynos850 based boards instead of "earlycon=exynos4210,0x13820000", as described in [1]: When used with no options, the early console is determined by stdout-path property in device tree's chosen node [1] Documentation/admin-guide/kernel-parameters.txt Signed-off-by: Sam Protsenko Link: https://patch.msgid.link/20251118024822.28148-1-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman

tty: serial: samsung_tty: support 18 uart ports

2025-05-01T15:20:27Z

ExynosAutov920 SoC supports 18 UART ports, update the value of UART_NR to accommodate the same. Signed-off-by: Faraz Ata Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20250429102941.4138463-1-faraz.ata@samsung.com Signed-off-by: Greg Kroah-Hartman

serial: switch uart_port::iotype to enum uart_iotype

2025-04-25T11:46:31Z

The inline-defined constants look weird. Instead, define a proper enum for them and type uart_port::iotype as that enum. This allows for proper checking in switch-case labels (somewhere, a default or UPIO_UNKNOWN label needs to be added/handled). Signed-off-by: Jiri Slaby (SUSE) Link: https://lore.kernel.org/r/20250425111315.1036184-4-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman

tty: serial: samsung: Add Exynos8895 compatible

2024-11-04T01:02:45Z

Add serial driver data for Exynos8895 SoC. The main difference from other platforms is that fifosize is only specified via the samsung,uart-fifosize DT property. Signed-off-by: Ivaylo Ivanov Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20241023090902.538040-3-ivo.ivanov.ivanov1@gmail.com Signed-off-by: Greg Kroah-Hartman

serial: Switch back to struct platform_driver::remove()

2024-10-11T06:13:28Z

After commit 0edb555a65d1 ("platform: Make platform_driver::remove() return void") .remove() is (again) the right callback to implement for platform drivers. Convert all platform drivers below drivers/tty/serial to use .remove(), with the eventual goal to drop struct platform_driver::remove_new(). As .remove() and .remove_new() have the same prototypes, conversion is done by just changing the structure member name in the driver initializer. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20241007205803.444994-7-u.kleine-koenig@baylibre.com Signed-off-by: Greg Kroah-Hartman

tty: serial: samsung: Fix serial rx on Apple A7-A9

2024-09-11T13:47:13Z

Apple's older A7-A9 SoCs seems to use bit 3 in UTRSTAT as RXTO, which is enabled by bit 11 in UCON. Access these bits in addition to the original RXTO and RXTO enable bits, to allow serial rx to function on A7-A9 SoCs. This change does not appear to affect the A10 SoC and up. Tested-by: Janne Grunau Reviewed-by: Neal Gompa Signed-off-by: Nick Chan Reviewed-by: Andi Shyti Link: https://lore.kernel.org/r/20240911050741.14477-4-towinchenmi@gmail.com Signed-off-by: Greg Kroah-Hartman

tty: serial: samsung: Fix A7-A11 serial earlycon SError

2024-09-11T13:47:13Z

Apple's earlier SoCs, like A7-A11, requires 32-bit writes for the serial port. Otherwise, a SError happens when writing to UTXH (+0x20). This only manifested in earlycon as reg-io-width in the device tree is consulted for normal serial writes. Change the iotype of the port to UPIO_MEM32, to allow the serial port to function on A7-A11 SoCs. This change does not appear to affect Apple M1 and above. Reviewed-by: Krzysztof Kozlowski Reviewed-by: Neal Gompa Tested-by: Janne Grunau Signed-off-by: Nick Chan Reviewed-by: Andi Shyti Link: https://lore.kernel.org/r/20240911050741.14477-3-towinchenmi@gmail.com Signed-off-by: Greg Kroah-Hartman

tty: serial: samsung_tty: cast the interrupt's void *id just once

2024-08-14T06:22:49Z

The interrupt handler routines and helpers are casting the 'void *' pointer to 'struct exynos_uart_port *' all over the place. There is no need for that, we can do the casting once and keep passing the 'struct exynos_uart_port *', simplifying the code and saving a few lines of code. No functional changes. Reviewed-by: Tudor Ambarus Signed-off-by: André Draszik Reviewed-by: Jiri Slaby Link: https://lore.kernel.org/r/20240808-samsung-tty-cleanup-v3-2-494412f49f4b@linaro.org Signed-off-by: Greg Kroah-Hartman

tty: serial: samsung_tty: drop unused argument to irq handlers

2024-08-14T06:22:49Z

The 'irq' argument is not used in any of the callees, we can just drop it and simplify the code. No functional changes. Reviewed-by: Tudor Ambarus Signed-off-by: André Draszik Reviewed-by: Jiri Slaby Link: https://lore.kernel.org/r/20240808-samsung-tty-cleanup-v3-1-494412f49f4b@linaro.org Signed-off-by: Greg Kroah-Hartman

tty: serial: switch from circ_buf to kfifo

2024-04-09T13:28:03Z

Switch from struct circ_buf to proper kfifo. kfifo provides much better API, esp. when wrap-around of the buffer needs to be taken into account. Look at pl011_dma_tx_refill() or cpm_uart_tx_pump() changes for example. Kfifo API can also fill in scatter-gather DMA structures, so it easier for that use case too. Look at lpuart_dma_tx() for example. Note that not all drivers can be converted to that (like atmel_serial), they handle DMA specially. Note that usb-serial uses kfifo for TX for ages. omap needed a bit more care as it needs to put a char into FIFO to start the DMA transfer when OMAP_DMA_TX_KICK is set. In that case, we have to do kfifo_dma_out_prepare twice: once to find out the tx_size (to find out if it is worths to do DMA at all -- size >= 4), the second time for the actual transfer. All traces of circ_buf are removed from serial_core.h (and its struct uart_state). Signed-off-by: Jiri Slaby (SUSE) Cc: Al Cooper Cc: Matthias Brugger Cc: AngeloGioacchino Del Regno Cc: Kumaravel Thiagarajan Cc: Tharun Kumar P Cc: Russell King Cc: Vineet Gupta Cc: Richard Genoud Cc: Nicolas Ferre Cc: Alexandre Belloni Cc: Claudiu Beznea Cc: Alexander Shiyan Cc: Baruch Siach Cc: Maciej W. Rozycki Cc: Shawn Guo Cc: Sascha Hauer Cc: Fabio Estevam Cc: Neil Armstrong Cc: Kevin Hilman Cc: Jerome Brunet Cc: Martin Blumenstingl Cc: Taichi Sugaya Cc: Takao Orito Cc: Bjorn Andersson Cc: Konrad Dybcio Cc: Pali Rohár Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Aneesh Kumar K.V Cc: Naveen N. Rao Cc: Manivannan Sadhasivam Cc: Krzysztof Kozlowski Cc: Alim Akhtar Cc: Laxman Dewangan Cc: Thierry Reding Cc: Jonathan Hunter Cc: Orson Zhai Cc: Baolin Wang Cc: Chunyan Zhang Cc: Patrice Chotard Cc: Maxime Coquelin Cc: Alexandre Torgue Cc: David S. Miller Cc: Hammer Hsieh Cc: Peter Korsgaard Cc: Timur Tabi Cc: Michal Simek Cc: Sumit Semwal Cc: Christian König Link: https://lore.kernel.org/r/20240405060826.2521-13-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman