linux-kernel - Re: [PATCH 1/3] SPI: Ingenic: Add support for use GPIO as chip select line.

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Date:   Wed, 20 Apr 2022 01:28:41 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     Mark Brown <broonie@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>
Cc:     robh+dt@...nel.org, krzk+dt@...nel.org, linux-spi@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, contact@...ur-rojek.eu,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, sernia.zhou@...mail.com,
        zhenwenjin@...il.com, reimu@...omaker.com
Subject: Re: [PATCH 1/3] SPI: Ingenic: Add support for use GPIO as chip select
 line.

Hi Mark,

On 2022/4/20 上午1:00, Mark Brown wrote:
> On Sat, Apr 16, 2022 at 05:36:46PM +0100, Paul Cercueil wrote:
>> Le sam., avril 16 2022 at 19:55:13 +0800, Zhou Yanjie
>>> On 2022/4/15 下午11:00, Paul Cercueil wrote:
>>>>> -    ctlr->num_chipselect = 2;
>>>>> +    ctlr->use_gpio_descriptors = true;
>>>> I wonder if this should be set conditionally instead. Maybe set it
>>>> to "true" if the "num-cs" property exists?
>>> I'm not too sure, but it seems some other drivers like "spi-sun6i.c",
>>> "spi-stm32.c", "spi-s3c64xx.c", "spi-pic32.c", etc. set it
>>> unconditionally.
>> Ok, maybe Mark can enlighten us here.
> use_gpio_descriptions is just selecting which version of the GPIO APIs
> we should use if we're handling GPIOs rather than if we should handle
> them.  We've got one last driver using the numerical GPIO APIs, once
> that one is converted we should just be able to drop the flag since
> everything will be using descriptors.


Thanks for your answer!