linux-kernel - Re: [PATCH v3 5/6] spi: at91-usart: add driver for at91-usart as spi

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Message-ID: <20180524181504.GD4828@sirena.org.uk>
Date:   Thu, 24 May 2018 19:15:04 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Radu Pirea <radu.pirea@...rochip.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Richard Genoud <richard.genoud@...il.com>,
        alexandre.belloni@...tlin.com,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Subject: Re: [PATCH v3 5/6] spi: at91-usart: add driver for at91-usart as spi

On Thu, May 24, 2018 at 07:04:11PM +0300, Radu Pirea wrote:

>     if (ctlr->cs_gpios){
>         spi->cs_gpio = ctlr->cs_gpios[spi->chip_select];
>         if(gpio_is_valid(spi->cs_gpio))
>             gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
> 
>     }

You're expected to request the GPIOs in your driver using one of the
modern request functions like gpio_request_one() (or ideally the GPIO
descriptor APIs now) which combine the direction setting and request
into a single operation.

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