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Date:   Tue, 19 Apr 2022 18:13:30 +0100
From:   Paul Cercueil <paul@crapouillou.net>
Subject: Re: [PATCH 1/3] SPI: Ingenic: Add support for use GPIO as chip select
 line.
To:     =?UTF-8?b?5ZGo55Cw5p2w?= <zhouyanjie@wanyeetech.com>
Cc:     broonie@kernel.org, robh+dt@kernel.org, krzk+dt@kernel.org,
        linux-spi@vger.kernel.org, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        contact@artur-rojek.eu, dongsheng.qiu@ingenic.com,
        aric.pzqi@ingenic.com, rick.tyliu@ingenic.com,
        sernia.zhou@foxmail.com, zhenwenjin@gmail.com, reimu@sudomaker.com
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In-Reply-To: <1650032528-118220-2-git-send-email-zhouyanjie@wanyeetech.com>
References: <1650032528-118220-1-git-send-email-zhouyanjie@wanyeetech.com>
        <1650032528-118220-2-git-send-email-zhouyanjie@wanyeetech.com>
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Hi Zhou,

Le ven., avril 15 2022 at 22:22:06 +0800, =E5=91=A8=E7=90=B0=E6=9D=B0 (Zhou=
 Yanjie)=20
<zhouyanjie@wanyeetech.com> a =C3=A9crit :
> Add support for using GPIOs as chip select lines on Ingenic SoCs.
>=20
> Signed-off-by: =E5=91=A8=E7=90=B0=E6=9D=B0 (Zhou Yanjie) <zhouyanjie@wany=
eetech.com>
> ---
>  drivers/spi/spi-ingenic.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
>=20
> 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=20
> platform_device *pdev)
>  	struct spi_controller *ctlr;
>  	struct ingenic_spi *priv;
>  	void __iomem *base;
> -	int ret;
> +	int num_cs, ret;
>=20
>  	pdata =3D of_device_get_match_data(dev);
>  	if (!pdata) {
> @@ -416,6 +416,11 @@ static int spi_ingenic_probe(struct=20
> platform_device *pdev)
>  	if (IS_ERR(priv->flen_field))
>  		return PTR_ERR(priv->flen_field);
>=20
> +	if (of_property_read_u32(dev->of_node, "num-cs", &num_cs)) {

One small comment here - I think it would be better to use=20
device_property_read_u32().

The driver should also use device_get_match_data() instead of=20
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 =3D 2;
> +	}
> +
>  	platform_set_drvdata(pdev, ctlr);
>=20
>  	ctlr->prepare_transfer_hardware =3D spi_ingenic_prepare_hardware;
> @@ -429,7 +434,9 @@ static int spi_ingenic_probe(struct=20
> platform_device *pdev)
>  	ctlr->bits_per_word_mask =3D pdata->bits_per_word_mask;
>  	ctlr->min_speed_hz =3D 7200;
>  	ctlr->max_speed_hz =3D 54000000;
> -	ctlr->num_chipselect =3D 2;
> +	ctlr->use_gpio_descriptors =3D true;
> +	ctlr->max_native_cs =3D 2;
> +	ctlr->num_chipselect =3D num_cs;
>  	ctlr->dev.of_node =3D pdev->dev.of_node;
>=20
>  	if (spi_ingenic_request_dma(ctlr, dev))
> --
> 2.7.4
>=20