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Message-ID: <d12545a3-6fae-99aa-3851-97f3ea352bf1@canonical.com>
Date: Thu, 2 Dec 2021 09:25:09 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To: Sam Protsenko <semen.protsenko@...aro.org>,
Rob Herring <robh+dt@...nel.org>
Cc: Jaewon Kim <jaewon02.kim@...sung.com>,
Chanho Park <chanho61.park@...sung.com>,
David Virag <virag.david003@...il.com>,
Youngmin Nam <youngmin.nam@...sung.com>,
Wolfram Sang <wsa@...nel.org>, Arnd Bergmann <arnd@...db.de>,
linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 3/6] dt-bindings: i2c: exynos5: Add bus clock
On 01/12/2021 20:04, Sam Protsenko wrote:
> In new Exynos SoCs (like Exynos850) where HSI2C is implemented as a
> part of USIv2 block, there are two clocks provided to HSI2C controller:
> - PCLK: bus clock (APB), provides access to register interface
> - IPCLK: operating IP-core clock; SCL is derived from this one
>
> Both clocks have to be asserted for HSI2C to be functional in that case.
>
> Modify bindings doc to allow specifying bus clock in addition to
> already described operating clock. Make it optional though, as older
> Exynos SoC variants only have one HSI2C clock.
I understand that it is required on newer SoCs, so you need "if:" adding
it to required properties on Autov8 or 850.
>
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> ---
> .../devicetree/bindings/i2c/i2c-exynos5.yaml | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-exynos5.yaml b/Documentation/devicetree/bindings/i2c/i2c-exynos5.yaml
> index db20e703dea0..a212c1d5e7d9 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-exynos5.yaml
> +++ b/Documentation/devicetree/bindings/i2c/i2c-exynos5.yaml
> @@ -49,11 +49,16 @@ properties:
> clock-frequency is >= 1MHz.
>
> clocks:
> - maxItems: 1
> - description: I2C operating clock
> + minItems: 1
> + items:
> + - description: I2C operating clock
> + - description: Bus clock (APB)
>
> clock-names:
> - const: hsi2c
> + minItems: 1
> + items:
> + - const: hsi2c
> + - const: hsi2c_pclk
>
> required:
> - compatible
>
Best regards,
Krzysztof
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