linux-kernel - Re: [PATCH v8 1/6] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support

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Date:   Sat, 06 Nov 2021 00:23:57 +0100
From:   Michael Walle <michael@...le.cc>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        robh+dt@...nel.org, lee.jones@...aro.org, p.zabel@...gutronix.de,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, andy.shevchenko@...il.com,
        luka.perkov@...tura.hr
Subject: Re: [PATCH v8 1/6] mfd: simple-mfd-i2c: Add Delta TN48M CPLD support

Am 2021-11-05 12:38, schrieb Robert Marko:
> Delta TN48M switches have a Lattice CPLD that serves
> multiple purposes including being a GPIO expander.
> 
> So, lets use the simple I2C MFD driver to provide the MFD core.
> 
> Also add a virtual symbol which pulls in the simple-mfd-i2c driver and
> provide a common symbol on which the subdevice drivers can depend on.
> 
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> ---
> Changes in v2:
> * Drop the custom MFD driver and header
> * Use simple I2C MFD driver
> ---
>  drivers/mfd/Kconfig          | 10 ++++++++++
>  drivers/mfd/simple-mfd-i2c.c |  1 +
>  2 files changed, 11 insertions(+)
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index ad15be6b86bc..3701657e831d 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -297,6 +297,16 @@ config MFD_ASIC3
>  	  This driver supports the ASIC3 multifunction chip found on many
>  	  PDAs (mainly iPAQ and HTC based ones)
> 
> +config MFD_TN48M_CPLD
> +	tristate "Delta Networks TN48M switch CPLD driver"
> +	depends on I2C
> +	select MFD_SIMPLE_MFD_I2C

Is this device used on multiple architectures? See commit
de1292817cf73 (mfd: MFD_SL28CPLD should depend on ARCH_LAYERSCAPE).

-michael