修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/drivers/i2c/busses/i2c-mxs.c
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@@ -25,6 +25,7 @@
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 #include <linux/of_device.h>
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 #include <linux/dma-mapping.h>
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 #include <linux/dmaengine.h>
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+#include <linux/dma/mxs-dma.h>
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 #define DRIVER_NAME "mxs-i2c"
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@@ -200,7 +201,8 @@
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 		dma_map_sg(i2c->dev, &i2c->sg_io[0], 1, DMA_TO_DEVICE);
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 		desc = dmaengine_prep_slave_sg(i2c->dmach, &i2c->sg_io[0], 1,
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 					DMA_MEM_TO_DEV,
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-					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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+					DMA_PREP_INTERRUPT |
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+					MXS_DMA_CTRL_WAIT4END);
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 		if (!desc) {
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 			dev_err(i2c->dev,
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 				"Failed to get DMA data write descriptor.\n");
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@@ -228,7 +230,8 @@
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 		dma_map_sg(i2c->dev, &i2c->sg_io[1], 1, DMA_FROM_DEVICE);
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 		desc = dmaengine_prep_slave_sg(i2c->dmach, &i2c->sg_io[1], 1,
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 					DMA_DEV_TO_MEM,
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-					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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+					DMA_PREP_INTERRUPT |
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+					MXS_DMA_CTRL_WAIT4END);
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 		if (!desc) {
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 			dev_err(i2c->dev,
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 				"Failed to get DMA data write descriptor.\n");
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@@ -260,7 +263,8 @@
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 		dma_map_sg(i2c->dev, i2c->sg_io, 2, DMA_TO_DEVICE);
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 		desc = dmaengine_prep_slave_sg(i2c->dmach, i2c->sg_io, 2,
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 					DMA_MEM_TO_DEV,
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-					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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+					DMA_PREP_INTERRUPT |
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+					MXS_DMA_CTRL_WAIT4END);
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 		if (!desc) {
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 			dev_err(i2c->dev,
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 				"Failed to get DMA data write descriptor.\n");
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@@ -731,7 +735,7 @@
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 	 * This is compensated for by subtracting the respective constants
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 	 * from the values written to the timing registers.
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 	 */
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-	if (speed > 100000) {
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+	if (speed > I2C_MAX_STANDARD_MODE_FREQ) {
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 		/* fast mode */
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 		low_count = DIV_ROUND_CLOSEST(divider * 13, (13 + 6));
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 		high_count = DIV_ROUND_CLOSEST(divider * 6, (13 + 6));
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@@ -769,7 +773,7 @@
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 	ret = of_property_read_u32(node, "clock-frequency", &speed);
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 	if (ret) {
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 		dev_warn(dev, "No I2C speed selected, using 100kHz\n");
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-		speed = 100000;
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+		speed = I2C_MAX_STANDARD_MODE_FREQ;
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 	}
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 	mxs_i2c_derive_timing(i2c, speed);
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@@ -802,7 +806,6 @@
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 	struct device *dev = &pdev->dev;
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 	struct mxs_i2c_dev *i2c;
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 	struct i2c_adapter *adap;
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-	struct resource *res;
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 	int err, irq;
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 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
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@@ -814,8 +817,7 @@
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 		i2c->dev_type = device_id->driver_data;
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 	}
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-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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-	i2c->regs = devm_ioremap_resource(&pdev->dev, res);
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+	i2c->regs = devm_platform_ioremap_resource(pdev, 0);
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 	if (IS_ERR(i2c->regs))
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 		return PTR_ERR(i2c->regs);
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@@ -838,10 +840,10 @@
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 	}
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 	/* Setup the DMA */
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-	i2c->dmach = dma_request_slave_channel(dev, "rx-tx");
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-	if (!i2c->dmach) {
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-		dev_err(dev, "Failed to request dma\n");
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-		return -ENODEV;
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+	i2c->dmach = dma_request_chan(dev, "rx-tx");
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+	if (IS_ERR(i2c->dmach)) {
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+		return dev_err_probe(dev, PTR_ERR(i2c->dmach),
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+				     "Failed to request dma\n");
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 	}
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 	platform_set_drvdata(pdev, i2c);