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@wanyeetech.com>
Reviewed-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/1650724725-93758-2-git-send-email-zhouyanjie@wanyeetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-ingenic.c b/drivers/spi/spi-ingenic.c
index 03077a7..e5faae5 100644 (file)
--- 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))