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

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Date:   Tue, 19 Apr 2022 18:13:30 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     周琰杰 <zhouyanjie@...yeetech.com>
Cc:     broonie@...nel.org, 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 Zhou,

Le ven., avril 15 2022 at 22:22:06 +0800, 周琰杰 (Zhou Yanjie) 
<zhouyanjie@...yeetech.com> a écrit :
> Add support for using GPIOs as chip select lines on Ingenic SoCs.
> 
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
>  drivers/spi/spi-ingenic.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/spi/spi-ingenic.c b/drivers/spi/spi-ingenic.c
> index 03077a7..672e4ed 100644
> --- a/drivers/spi/spi-ingenic.c
> +++ b/drivers/spi/spi-ingenic.c
> @@ -380,7 +380,7 @@ static int spi_ingenic_probe(struct 
> platform_device *pdev)
>  	struct spi_controller *ctlr;
>  	struct ingenic_spi *priv;
>  	void __iomem *base;
> -	int ret;
> +	int num_cs, ret;
> 
>  	pdata = of_device_get_match_data(dev);
>  	if (!pdata) {
> @@ -416,6 +416,11 @@ static int spi_ingenic_probe(struct 
> platform_device *pdev)
>  	if (IS_ERR(priv->flen_field))
>  		return PTR_ERR(priv->flen_field);
> 
> +	if (of_property_read_u32(dev->of_node, "num-cs", &num_cs)) {

One small comment here - I think it would be better to use 
device_property_read_u32().

The driver should also use device_get_match_data() instead of 
of_device_get_match_data(), but that's a cleanup that can be done later.

Cheers,
-Paul

> +		dev_warn(dev, "Number of chip select lines not specified.\n");
> +		num_cs = 2;
> +	}
> +
>  	platform_set_drvdata(pdev, ctlr);
> 
>  	ctlr->prepare_transfer_hardware = spi_ingenic_prepare_hardware;
> @@ -429,7 +434,9 @@ static int spi_ingenic_probe(struct 
> platform_device *pdev)
>  	ctlr->bits_per_word_mask = pdata->bits_per_word_mask;
>  	ctlr->min_speed_hz = 7200;
>  	ctlr->max_speed_hz = 54000000;
> -	ctlr->num_chipselect = 2;
> +	ctlr->use_gpio_descriptors = true;
> +	ctlr->max_native_cs = 2;
> +	ctlr->num_chipselect = num_cs;
>  	ctlr->dev.of_node = pdev->dev.of_node;
> 
>  	if (spi_ingenic_request_dma(ctlr, dev))
> --
> 2.7.4
>