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Date: Sat, 23 Apr 2022 03:09:41 +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, 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 v2 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> --- Notes: v1->v2: Use "device_property_read_u32()" instead "of_property_read_u32()" as Paul Cercueil's suggestion. 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..bb512ca 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 (device_property_read_u32(dev, "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; + 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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