linux-kernel - [PATCH v3 1/3] SPI: Ingenic: Add support for use GPIO as chip select line.

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Date:   Sat, 23 Apr 2022 22:38:43 +0800
From:   周琰杰 (Zhou Yanjie) 
        <zhouyanjie@...yeetech.com>
To:     broonie@...nel.org, robh+dt@...nel.org, krzk+dt@...nel.org
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, devicetree@...r.kernel.org,
        paul@...pouillou.net, 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: [PATCH v3 1/3] SPI: Ingenic: Add support for use GPIO as chip select line.

Add support for using GPIOs as chip select lines on Ingenic SoCs.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
Reviewed-by: Paul Cercueil <paul@...pouillou.net>
---

Notes:
    v1->v2:
    Use "device_property_read_u32()" instead "of_property_read_u32()"
    as Paul Cercueil's suggestion.
    
    v2->v3:
    Remove unnecessary "dev_warn()" as Paul Cercueil's suggestion.

 drivers/spi/spi-ingenic.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-ingenic.c b/drivers/spi/spi-ingenic.c
index 03077a7..e5faae5 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 +416,9 @@ static int spi_ingenic_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->flen_field))
 		return PTR_ERR(priv->flen_field);
 
+	if (device_property_read_u32(dev, "num-cs", &num_cs))
+		num_cs = 2;
+
 	platform_set_drvdata(pdev, ctlr);
 
 	ctlr->prepare_transfer_hardware = spi_ingenic_prepare_hardware;
@@ -429,7 +432,9 @@ 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