linux-kernel - Re: [RFC net-next 15/15] net: lora: Add Semtech SX1301

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Message-ID: <20180704143207.GD11693@sirena.org.uk>
Date:   Wed, 4 Jul 2018 15:32:07 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ben Whitten <Ben.Whitten@...rdtech.com>
Cc:     Andreas Färber <afaerber@...e.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jian-Hong Pan <starnight@...cu.edu.tw>,
        Jiri Pirko <jiri@...nulli.us>,
        Marcel Holtmann <marcel@...tmann.org>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <mbrugger@...e.com>,
        Janus Piwek <jpiwek@...oweurope.com>,
        Michael Röder <michael.roeder@...et.eu>,
        Dollar Chen <dollar.chen@...ec.com>,
        Ken Yu <ken.yu@...wireless.com>,
        Steve deRosier <derosier@...il.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "LoRa_Community_Support@...tech.com" 
        <LoRa_Community_Support@...tech.com>,
        Hasnain Virk <Hasnain.Virk@....com>
Subject: Re: [RFC net-next 15/15] net: lora: Add Semtech SX1301

On Wed, Jul 04, 2018 at 01:41:42PM +0000, Ben Whitten wrote:

Please fix your mail client to word wrap within paragraphs at something
substantially less than 80 columns.  Doing this makes your messages much
easier to read and reply to.

> In my SX1257 driver currently the regmap is backed via SPI with
> devm_regmap_init_spi, please correct me if I am wrong but if I
> understand correctly this could be split out to regmap backed by SPI
> in the case of a direct host connection, and a regmap backed by the
> SX1301's regmapped strobing register interface, regmap_bus?

Yes.

> Is there a precedent to this I can examine?

There's lots of devices that provide both SPI and I2C, you'd just be
using a regmap_bus instead of the I2C one.  I can't recall an example of
the specific combination you're looking for though.

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