linux-kernel - Re: [PATCH 1/3] mfd: cros-ec: Add functions to read mapped memory

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Date:   Thu, 13 Apr 2017 15:53:38 -0700
From:   Moritz Fischer <moritz.fischer.private@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Moritz Fischer <moritz.fischer@...us.com>,
        linux-hwmon@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>, olof@...om.net,
        jdelvare@...e.com, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 1/3] mfd: cros-ec: Add functions to read mapped memory

Hi Guenter,

On Thu, Apr 13, 2017 at 2:03 PM, Guenter Roeck <linux@...ck-us.net> wrote:
> On Fri, Apr 07, 2017 at 03:00:08PM -0700, Moritz Fischer wrote:
>> From: Moritz Fischer <mdf@...nel.org>
>>
>> The ChromeOS EC has mapped memory regions where things like temperature
>> sensors and fan speed are stored. Provide access to those from the
>> cros-ec mfd device.
>>
>
> Turns out struct cros_ec_device already provides a cmd_readmem callback,
> which is widely used by other drivers. Why don't you just use it ?

This is only actually set by the lpc version of the cros_ec. I2C and
SPI connected ECs
emulate it. I can most certainly hook it up in the (spi,i2c) drivers,
but the implementation
for SPI and I2C needs to live somewhere. drivers/platform/chrome/cros_ec_proto.c
seemed to be a good place.

Thanks for the feedback!

Moritz