Re: [PATCH v3 1/2] dt-bindings: i2c: exynos5: add exynosautov9-hsi2c compatible

From: Krzysztof Kozlowski
Date: Fri Nov 19 2021 - 03:58:01 EST


On 12/11/2021 02:01, Jaewon Kim wrote:
> This patch adds new "samsung,exynosautov9-hsi2c" compatible.
> It is for i2c compatible with HSI2C available on Exynos SoC with USI.
>
> Signed-off-by: Jaewon Kim <jaewon02.kim@xxxxxxxxxxx>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>

Thanks Jaewon for your patch. After more discussions and remarks from
David, I think we should go with dedicated USI driver instead of using
sysreg/syscon in every I2C/UART/SPI.

Therefore I want to remove my reviewed-by and instead ask to work on
dedicated USI driver (option 1 from Chanho's email).

It's not that this solution is anything bad, just it won't be flexible
to support USIv1. It will also lead to duplicated - and possibly
conflicting - USI configuration in each of drivers (I2C/UART/SPI).

> ---
> Documentation/devicetree/bindings/i2c/i2c-exynos5.txt | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
> index 2dbc0b62daa6..39f4067d9d1f 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-exynos5.txt
> @@ -14,6 +14,8 @@ Required properties:
> on Exynos5260 SoCs.
> -> "samsung,exynos7-hsi2c", for i2c compatible with HSI2C available
> on Exynos7 SoCs.
> + -> "samsung,exynosautov9-hsi2c", for i2c compatible with HSI2C available
> + on ExynosAutov9 SoCs.
>
> - reg: physical base address of the controller and length of memory mapped
> region.
> @@ -31,6 +33,11 @@ Optional properties:
> at 100khz.
> -> If specified, the bus operates in high-speed mode only if the
> clock-frequency is >= 1Mhz.
> + - samsung,sysreg : system registers controller phandle to control USI.
> + -> If I2C integrated to USI(Universal Serial Interface), this property
> + is required. When using Exynos USI block, it needs to select which type
> + of Serial IPs(UART, SPI, I2C) to use with system register. So, it
> + requires samsung,sysreg phandle and offset value of system register.
>
> Example:
>
>


Best regards,
Krzysztof