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[v2,0/3] soc: samsung: usi: implement support for USIv1

Message ID 20250104162915.332005-1-ivo.ivanov.ivanov1@gmail.com
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Series soc: samsung: usi: implement support for USIv1 | expand

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Ivaylo Ivanov Jan. 4, 2025, 4:29 p.m. UTC 
Hey folks,

This patch series adds support for USIv1 in the existing exynos-usi driver,
as well as dedicated sysreg compatibles for exynos8895.

The USIv1 IP-core is found on some ARM64 Exynos SoCs (like Exynos8895).
It provides selectable serial protocols (one of: HSI2C0, HSI2C1, HSI2C0_1,
SPI, UART, UART_HSI2C1). It's a bit different from USIv2 as it doesn't
have any known MMIO register map and the serial protocols that it
implements share the same register base, hence why the way of modelling it
in device trees will be with ranges, like so:

usi1: usi@10460000 {
  compatible = "samsung,exynos8895-usi";
  ranges = <0x0 0x10460000 0x11000>;
  clocks = <1>, <2>;
  clock-names = "pclk", "ipclk";
  #address-cells = <1>;
  #size-cells = <1>;
  samsung,sysreg = <&syscon_peric0 0x1004>;
  status = "disabled";

  hsi2c_5: i2c@0 {
    compatible = "samsung,exynos8895-hsi2c";
    reg = <0x0 0x1000>;
    ...
  };
};

This patchset also assumes that [1] and [2] have been merged before it.

Best regards,
Ivaylo

[1]: https://lore.kernel.org/all/20241222145257.31451-1-krzysztof.kozlowski@linaro.org/
[2]: https://lore.kernel.org/all/20250103082549.19419-1-krzysztof.kozlowski@linaro.org/

Changes in v2:
  - add r-b from Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
  - restrict the possible ids of samsung,mode with an allOf:if:then
  - set the properties samsung,clkreq-on and reg to false for non-usiv2
  - only make use of exynos_usi_modes
  - make sure pclk and ipclk are enabled

Ivaylo Ivanov (3):
  dt-bindings: soc: samsung: exynos-sysreg: add sysreg compatibles for
    exynos8895
  dt-bindings: soc: samsung: usi: add USIv1 and samsung,exynos8895-usi
  soc: samsung: usi: implement support for USIv1

 .../bindings/soc/samsung/exynos-usi.yaml      | 55 +++++++++++++++----
 .../soc/samsung/samsung,exynos-sysreg.yaml    |  8 +++
 drivers/soc/samsung/exynos-usi.c              | 42 +++++++++++++-
 include/dt-bindings/soc/samsung,exynos-usi.h  |  7 +++
 4 files changed, 97 insertions(+), 15 deletions(-)