linux-kernel - [PATCH v3 0/3] serial: Add RISC-V support to the earlycon semihost driver

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Message-Id: <20221209150437.795918-1-bmeng@tinylab.org>
Date:   Fri,  9 Dec 2022 23:04:34 +0800
From:   Bin Meng <bmeng@...ylab.org>
To:     linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-serial@...r.kernel.org
Cc:     Albert Ou <aou@...s.berkeley.edu>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 0/3] serial: Add RISC-V support to the earlycon semihost driver


RISC-V semihosting spec [1] is built on top of the existing Arm one;
we can add RISC-V earlycon semihost driver easily.

This series refactors the existing driver a little bit, to move smh_putc()
variants in respective arch's semihost.h, then we can implement RISC-V's
version in the riscv arch directory.

Link: https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc [1]

Changes in v3:
- add #ifdef in the header to prevent from multiple inclusion
- add forward-declare struct uart_port
- add a Link tag in the commit message

Changes in v2:
- new patch: "serial: earlycon-arm-semihost: Move smh_putc() variants in respective arch's semihost.h"
- Move the RISC-V implementation to semihost.h

Bin Meng (3):
  serial: earlycon-arm-semihost: Move smh_putc() variants in respective
    arch's semihost.h
  riscv: Implement semihost.h for earlycon semihost driver
  serial: Rename earlycon semihost driver

 arch/arm/include/asm/semihost.h               | 30 +++++++++++++++++++
 arch/arm64/include/asm/semihost.h             | 24 +++++++++++++++
 arch/riscv/include/asm/semihost.h             | 26 ++++++++++++++++
 drivers/tty/serial/Kconfig                    | 14 ++++-----
 drivers/tty/serial/Makefile                   |  2 +-
 ...con-arm-semihost.c => earlycon-semihost.c} | 25 +---------------
 6 files changed, 89 insertions(+), 32 deletions(-)
 create mode 100644 arch/arm/include/asm/semihost.h
 create mode 100644 arch/arm64/include/asm/semihost.h
 create mode 100644 arch/riscv/include/asm/semihost.h
 rename drivers/tty/serial/{earlycon-arm-semihost.c => earlycon-semihost.c} (57%)

-- 
2.34.1