linux-kernel - Re: [PATCH] arm64: dts: armada-3720-turris-mox.dts: remove mrvl,i2c-fast-mode

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Message-ID: <20210628150553.4e026d19@thinkpad>
Date:   Mon, 28 Jun 2021 15:05:53 +0200
From:   Marek Behún <kabel@...nel.org>
To:     Pali Rohár <pali@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: armada-3720-turris-mox.dts: remove
 mrvl,i2c-fast-mode

On Mon, 28 Jun 2021 14:10:15 +0200
Pali Rohár <pali@...nel.org> wrote:

> +	/delete-property/mrvl,i2c-fast-mode;

Can you add an additional space here?
  /delete-property/ mrvl,i2c-fast-mode;

Other than that

Reviewed-by: Marek Behún <kabel@...nel.org>

BTW the i2c driver should me made to respect the `clock-frequency` DT
property, not the fast-mode nonsense.

The `mrvl,i2c-fast-mode` should be IMO completely removed and whether it
is enabled should be decided by the value of `clock-frequency`.

BTW there are clock generating registers in A3720 I2C controller that
can generate 100 kHz even in fast-mode. The driver does not use them,
though, it leaves them to their default values, which for normal mode
generate ~96 kHz and for fast mode ~258 kHz. Maybe we should implement
configuring these registers and make the driver choose
normal-mode / fast-mode / high-speed mode depending on
`clock-frequency` ?

Marek