linux-kernel - Re: [PATCH 3/6] gpio: Add Delta TN48M CPLD GPIO driver

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Message-ID: <20210506140024.GB3340759@robh.at.kernel.org>
Date:   Thu, 6 May 2021 09:00:24 -0500
From:   Rob Herring <robh@...nel.org>
To:     Robert Marko <robert.marko@...tura.hr>
Cc:     lee.jones@...aro.org, linus.walleij@...aro.org,
        bgolaszewski@...libre.com, jdelvare@...e.com, linux@...ck-us.net,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-hwmon@...r.kernel.org,
        luka.perkov@...tura.hr, jmp@...phyte.org, pmenzel@...gen.mpg.de,
        buczek@...gen.mpg.de
Subject: Re: [PATCH 3/6] gpio: Add Delta TN48M CPLD GPIO driver

On Fri, Apr 30, 2021 at 02:35:08PM +0200, Robert Marko wrote:
> Delta TN48M CPLD is used as a GPIO expander for the SFP GPIOs.
> 
> It is a mix of input only and output only pins.
> 
> Since there is no logical GPIO numbering arbitrary one is used
> along dt-bindings to make it humanly readable.
> 
> Signed-off-by: Robert Marko <robert.marko@...tura.hr>
> ---
>  drivers/gpio/Kconfig      |  12 +++
>  drivers/gpio/Makefile     |   1 +
>  drivers/gpio/gpio-tn48m.c | 191 ++++++++++++++++++++++++++++++++++++++
>  drivers/mfd/tn48m-cpld.c  |   6 +-
>  include/linux/mfd/tn48m.h |   3 +
>  5 files changed, 212 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpio/gpio-tn48m.c


> +static const struct platform_device_id tn48m_gpio_id_table[] = {
> +	{ "delta,tn48m-gpio", },

Looks like a compatible, but is not. I think you can drop this and just 
use 'tm48m-gpio' (the driver name).

Same for hwmon.

Rob

> +	{ }
> +};
> +MODULE_DEVICE_TABLE(platform, tn48m_gpio_id_table);
> +
> +static struct platform_driver tn48m_gpio_driver = {
> +	.driver = {
> +		.name = "tn48m-gpio",
> +	},
> +	.probe = tn48m_gpio_probe,
> +	.id_table = tn48m_gpio_id_table,
> +};
> +module_platform_driver(tn48m_gpio_driver);