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

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Hi Zhou,

Le sam., avril 16 2022 at 19:55:13 +0800, Zhou Yanjie <zhouyanjie@xxxxxxxxxxxxxx> a écrit :
Hi Paul,

On 2022/4/15 下午11:00, Paul Cercueil wrote:
Hi Zhou,

Le ven., avril 15 2022 at 22:22:06 +0800, 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx> a écrit :
Add support for using GPIOs as chip select lines on Ingenic SoCs.

Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
---
 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)) {
+ 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;

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.

Cheers,
-Paul


The rest looks good to me.

Cheers,
-Paul

+    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








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