netdev - Re: [PATCH v1 net-next] net: dsa: microchip: add KSZ9477 I2C driver

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Message-ID: <ee3d578a-04eb-89dc-99ee-d2a99b0cf9ba@denx.de>
Date:   Thu, 20 Dec 2018 00:11:18 +0100
From:   Marek Vasut <marex@...x.de>
To:     Tristram.Ha@...rochip.com
Cc:     vivien.didelot@...oirfairelinux.com, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org, sergio.paracuellos@...il.com,
        andrew@...n.ch, dan.carpenter@...cle.com, pavel@....cz,
        f.fainelli@...il.com
Subject: Re: [PATCH v1 net-next] net: dsa: microchip: add KSZ9477 I2C driver

On 12/19/2018 11:30 PM, Tristram.Ha@...rochip.com wrote:
>> Can this use regmap instead ?
>>
> 
> To tell the truth I do not know how.
> 
> Some customers, like Sergio, seem to be using KSZ9897 with I2C in their projects
> and so cannot wait further.

Well, I just did 'git grep regmap_i2c drivers' and 'git grep regmap_spi
drivers/' and found eg.
drivers/iio/pressure/zpa2326_i2c.c
drivers/iio/pressure/zpa2326_spi.c

There's plenty of drivers using regmap in drivers/ to demonstrate how to
use it. And there's always include/linux/regmap.h .

In this specific (DSA) case, register either regmap_spi or regmap_i2c in
the ksz_switch_register(), pop the regmap pointer into ksz_device and
then use it in ksz_read*()/ksz_write*(). You can then, in a subsequent
patch, massage the regmap accesses directly into the code instead and
drop the ksz_read*()/ksz_write*() functions altogether, since those
would be just regmap function wrappers.

And if you're still lost, I can start on the conversion myself.

I'm sure Sergio can wait.

-- 
Best regards,
Marek Vasut