i2c: designware: add MSCC Ocelot support (1bb39959) · Commits · 戴 / test

drivers/i2c/busses/i2c-designware-core.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -225,6 +225,7 @@
		struct dw_i2c_dev {
		struct device *dev;
		void __iomem *base;
		void __iomem *ext;
		struct completion cmd_complete;
		struct clk *clk;
		struct reset_control *rst;
		@@ -279,6 +280,8 @@ struct dw_i2c_dev {
		#define ACCESS_INTR_MASK 0x00000004

		#define MODEL_CHERRYTRAIL 0x00000100
		#define MODEL_MSCC_OCELOT 0x00000200
		#define MODEL_MASK 0x00000f00

		u32 dw_readl(struct dw_i2c_dev *dev, int offset);
		void dw_writel(struct dw_i2c_dev *dev, u32 b, int offset);

+40 −0

Original line number	Diff line number	Diff line
		@@ -157,11 +157,48 @@ static inline int dw_i2c_acpi_configure(struct platform_device *pdev)
		#endif

		#ifdef CONFIG_OF
		#define MSCC_ICPU_CFG_TWI_DELAY 0x0
		#define MSCC_ICPU_CFG_TWI_DELAY_ENABLE BIT(0)
		#define MSCC_ICPU_CFG_TWI_SPIKE_FILTER 0x4

		static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev)
		{
		writel((dev->sda_hold_time << 1) \| MSCC_ICPU_CFG_TWI_DELAY_ENABLE,
		dev->ext + MSCC_ICPU_CFG_TWI_DELAY);

		return 0;
		}

		static int dw_i2c_of_configure(struct platform_device *pdev)
		{
		struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
		struct resource *mem;

		switch (dev->flags & MODEL_MASK) {
		case MODEL_MSCC_OCELOT:
		mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
		dev->ext = devm_ioremap_resource(&pdev->dev, mem);
		if (!IS_ERR(dev->ext))
		dev->set_sda_hold_time = mscc_twi_set_sda_hold_time;
		break;
		default:
		break;
		}

		return 0;
		}

		static const struct of_device_id dw_i2c_of_match[] = {
		{ .compatible = "snps,designware-i2c", },
		{ .compatible = "mscc,ocelot-i2c", .data = (void *)MODEL_MSCC_OCELOT },
		{},
		};
		MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
		#else
		static inline int dw_i2c_of_configure(struct platform_device *pdev)
		{
		return -ENODEV;
		}
		#endif

		static void i2c_dw_configure_master(struct dw_i2c_dev *dev)
		@@ -296,6 +333,9 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)

		dev->flags \|= (uintptr_t)device_get_match_data(&pdev->dev);

		if (pdev->dev.of_node)
		dw_i2c_of_configure(pdev);

		if (has_acpi_companion(&pdev->dev))
		dw_i2c_acpi_configure(pdev);