linux-kernel - Re: [PATCH v4 1/2] dt-bindings: i2c: snps,designware-i2c: declare bus capacitance and clk freq optimized

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Message-ID: <90b7f2a3-8ebe-44da-82b3-def6206cd399@kernel.org>
Date: Thu, 3 Oct 2024 15:21:51 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Michael Wu <michael.wu@...ron.us>, Andi Shyti <andi.shyti@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Jan Dabros <jsd@...ihalf.com>, linux-i2c@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Morgan Chang <morgan.chang@...ron.us>, mvp.kutali@...il.com
Subject: Re: [PATCH v4 1/2] dt-bindings: i2c: snps,designware-i2c: declare bus
 capacitance and clk freq optimized

On 03/10/2024 13:15, Michael Wu wrote:
> Since there are no registers controlling the hardware parameters
> IC_CAP_LOADING and IC_CLK_FREQ_OPTIMIZATION, their values can only be
> declared in the device tree.
> 
> snps,bus-capacitance-pf indicates the bus capacitance in picofarads (pF).
> It affects the high and low pulse width of SCL line in high speed mode.
> The legal values for this property are 100 and 400 only, and default
> value is 100. This property corresponds to IC_CAP_LOADING.
> 
> snps,clk-freq-optimized indicates whether the hardware reduce its
> internal clock frequency by reducing the internal latency required to
> generate the high period and low period of SCL line. This property
> corresponds to IC_CLK_FREQ_OPTIMIZATION.
> 
> The driver can calculate the high period count and low period count of
> SCL line for high speed mode based on these two properties.
> 
> Signed-off-by: Michael Wu <michael.wu@...ron.us>
> ---


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>


---

<form letter>
This is an automated instruction, just in case, because many review tags
are being ignored. If you know the process, you can skip it (please do
not feel offended by me posting it here - no bad intentions intended).
If you do not know the process, here is a short explanation:

Please add Acked-by/Reviewed-by/Tested-by tags when posting new
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can help here. However, there's no need to repost patches *only* to add
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https://elixir.bootlin.com/linux/v6.5-rc3/source/Documentation/process/submitting-patches.rst#L577
</form letter>

Best regards,
Krzysztof