linux-kernel - [PATCH 0/3] Add Samsung SPEEDY serial bus host controller driver

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Message-Id: <20241212-speedy-v1-0-544ad7bcfb6a@gmail.com>
Date: Thu, 12 Dec 2024 23:09:00 +0200
From: Markuss Broks <markuss.broks@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>, 
 Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>, 
 Markuss Broks <markuss.broks@...il.com>, 
 Maksym Holovach <nergzd@...gzd723.xyz>
Subject: [PATCH 0/3] Add Samsung SPEEDY serial bus host controller driver

Hey,

This series adds support for the Samsung SPEEDY serial bus host
controller. Samsung SPEEDY (actually an acronym) is a proprietary
Samsung 1 wire serial bus, which is used on various Samsung devices.

This driver adds support for the version of controller without the
IP_BATCHER block. It appears that block is a small MCU attached to
the SPEEDY controller to offload the SPEEDY I/O tasks from the AP.
IP_BATCHER is found on Exynos7885, but not found on Exynos9810 and
Exynos8895. This version of driver should still work on Exynos7885
though, but the IP_BATCHER is not supported at the moment.

On Exynos9810, SPEEDY controllers are also mapped into MMIO space
of other processors on the CPU. For example, APM also has a window
to the SPEEDY IP, and it uses it for power-management related things.
During testing however, it seems that if APM is not active the AP can
access the SPEEDY controller freely and without interference from APM
firmware.

Things to improve:

- SPEEDY host controller has an interrupt line to the AP, but current
implementation uses polling instead,
- add support for handling IP_BATCHER block,
- add support for bulk transfers,
- test on other SoCs (Exynos9820, 9830, 9840, ...).
- runtime PM

- Markuss

To: Rob Herring <robh@...nel.org>
To: Krzysztof Kozlowski <krzk+dt@...nel.org>
To: Conor Dooley <conor+dt@...nel.org>
To: Alim Akhtar <alim.akhtar@...sung.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-samsung-soc@...r.kernel.org
Cc: devicetree@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org

Cc: Ivaylo Ivanov <ivo.ivanov.ivanov1@...il.com>

Signed-off-by: Markuss Broks <markuss.broks@...il.com>
---
Markuss Broks (3):
      dt-bindings: soc: samsung: exynos-speedy: Document SPEEDY host controller bindings
      soc: samsung: Add a driver for Samsung SPEEDY host controller
      MAINTAINERS: Add entry for the Samsung Exynos SPEEDY host controller

 .../bindings/soc/samsung/exynos-speedy.yaml        |  78 ++++
 MAINTAINERS                                        |   7 +
 drivers/soc/samsung/Kconfig                        |  13 +
 drivers/soc/samsung/Makefile                       |   2 +
 drivers/soc/samsung/exynos-speedy.c                | 457 +++++++++++++++++++++
 include/linux/soc/samsung/exynos-speedy.h          |  56 +++
 6 files changed, 613 insertions(+)
---
base-commit: 1b2ab8149928c1cea2d7eca30cd35bb7fe014053
change-id: 20241210-speedy-e43f5df2b1d6

Best regards,
-- 
Markuss Broks <markuss.broks@...il.com>