linux-kernel - Re: [PATCH v3 4/6] i2c: designware: add MSCC Ocelot support

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Message-ID: <20180807174222.GA5720@rob-hp-laptop>
Date:   Tue, 7 Aug 2018 11:42:22 -0600
From:   Rob Herring <robh@...nel.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        James Hogan <jhogan@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rosemi.com>
Subject: Re: [PATCH v3 4/6] i2c: designware: add MSCC Ocelot support

On Mon, Aug 06, 2018 at 08:54:10PM +0200, Alexandre Belloni wrote:
> The Microsemi Ocelot I2C controller is a designware IP. It also has a
> second set of registers to allow tweaking SDA hold time and spike
> filtering.
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---
>  .../bindings/i2c/i2c-designware.txt           |  9 ++++-

Please split binding patches.

>  drivers/i2c/busses/i2c-designware-core.h      |  3 ++
>  drivers/i2c/busses/i2c-designware-platdrv.c   | 40 +++++++++++++++++++
>  3 files changed, 50 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> index fbb0a6d8b964..7886f2dc6675 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> @@ -2,7 +2,8 @@
>  
>  Required properties :
>  
> - - compatible : should be "snps,designware-i2c"
> + - compatible : should be "snps,designware-i2c" or "mscc,ocelot-i2c" followed by
> +   "snps,designware-i2c" for fallback

Please reformat to one valid combination per line.

>   - reg : Offset and length of the register set for the device
>   - interrupts : <IRQ> where IRQ is the interrupt number.
>  
> @@ -11,8 +12,12 @@ Recommended properties :
>   - clock-frequency : desired I2C bus clock frequency in Hz.
>  
>  Optional properties :
> + - reg : for "mscc,ocelot-i2c", a second register set to configure the SDA hold
> +   time, named ICPU_CFG:TWI_DELAY in the datasheet.
> +
>   - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
> -   This option is only supported in hardware blocks version 1.11a or newer.
> +   This option is only supported in hardware blocks version 1.11a or newer and
> +   on Microsemi SoCs ("mscc,ocelot-i2c" compatible).
>  
>   - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds.
>     This value which is by default 300ns is used to compute the tLOW period.