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Date:   Thu, 2 Nov 2017 15:22:43 +0100
From:   Linus Walleij <>
To:     Sebastien Bourdelin <>
Cc:     "" <>,
        kernel <>,
        Rob Herring <>,
        "" <>,
        Guenter Roeck <>,
        Fabio Estevam <>,
        Mark Featherston <>,
Subject: Re: [PATCH v7 2/2] bus: add driver for the Technologic Systems NBUS

On Wed, Nov 1, 2017 at 6:14 PM, Sebastien Bourdelin
<> wrote:

> This driver implements a GPIOs bit-banged bus, called the NBUS by
> Technologic Systems. It is used to communicate with the peripherals in
> the FPGA on the TS-4600 SoM.
> Signed-off-by: Sebastien Bourdelin <>
> Acked-by: Linus Walleij <>

This is still a very nice driver.

If you are working on supplemental patches: from the next merge window
we will have:

+ int gpiod_get_array_value_cansleep(unsigned int array_size,
+                                          struct gpio_desc **desc_array,
+                                          int *value_array);


If your GPIO controller also has .get_multiple() implemented it just
becomes one register read if you're lucky.

BTW do you have a way upstream for this patch? ARM SoC?

Linus Walleij

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