drivers/i2c: Add GPIO configuration for VIC7100.

[FIXME] why we can not do it in U-boot? [geert: Rebase to v5.13-rc1]
atishp04 · May 16, 2021 · e306a79 · e306a79
1 parent 8b962ee
commit e306a79
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diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
@@ -286,6 +286,8 @@ struct dw_i2c_dev {
 	int			(*init)(struct dw_i2c_dev *dev);
 	int			(*set_sda_hold_time)(struct dw_i2c_dev *dev);
 	int			mode;
+	int			scl_gpio;
+	int			sda_gpio;
 	struct i2c_bus_recovery_info rinfo;
 	bool			suspended;
 };

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
@@ -20,6 +20,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
+#include <linux/gpio-starfive-vic.h>
 
 #include "i2c-designware-core.h"
 
@@ -164,6 +165,48 @@ static int i2c_dw_set_timings_master(struct dw_i2c_dev *dev)
 	return 0;
 }
 
+static void i2c_dw_configure_gpio(struct dw_i2c_dev *dev)
+{
+#ifdef CONFIG_SOC_STARFIVE_VIC7100_I2C_GPIO
+	if((dev->scl_gpio > 0) && (dev->sda_gpio > 0)) {
+		SET_GPIO_dout_LOW(dev->scl_gpio);
+		SET_GPIO_dout_LOW(dev->sda_gpio);
+		SET_GPIO_doen_reverse_(dev->scl_gpio,1);
+		SET_GPIO_doen_reverse_(dev->sda_gpio,1);
+		switch(dev->adapter.nr) {
+		case 0:
+			SET_GPIO_doen_i2c0_pad_sck_oe(dev->scl_gpio);
+			SET_GPIO_doen_i2c0_pad_sda_oe(dev->sda_gpio);
+			SET_GPIO_i2c0_pad_sck_in(dev->scl_gpio);
+			SET_GPIO_i2c0_pad_sda_in(dev->sda_gpio);
+			break;
+		case 1:
+			SET_GPIO_doen_i2c1_pad_sck_oe(dev->scl_gpio);
+			SET_GPIO_doen_i2c1_pad_sda_oe(dev->sda_gpio);
+			SET_GPIO_i2c1_pad_sck_in(dev->scl_gpio);
+			SET_GPIO_i2c1_pad_sda_in(dev->sda_gpio);
+			break;
+		case 2:
+			SET_GPIO_doen_i2c2_pad_sck_oe(dev->scl_gpio);
+			SET_GPIO_doen_i2c2_pad_sda_oe(dev->sda_gpio);
+			SET_GPIO_i2c2_pad_sck_in(dev->scl_gpio);
+			SET_GPIO_i2c2_pad_sda_in(dev->sda_gpio);
+			break;
+		case 3:
+			SET_GPIO_doen_i2c3_pad_sck_oe(dev->scl_gpio);
+			SET_GPIO_doen_i2c3_pad_sda_oe(dev->sda_gpio);
+			SET_GPIO_i2c3_pad_sck_in(dev->scl_gpio);
+			SET_GPIO_i2c3_pad_sda_in(dev->sda_gpio);
+			break;
+		default:
+			dev_err(dev->dev, "i2c adapter number is invalid\n");
+		}
+	} else
+		dev_err(dev->dev, "scl/sda gpio number is invalid !\n");
+#endif
+	return;
+}
+
 /**
  * i2c_dw_init() - Initialize the designware I2C master hardware
  * @dev: device private data
@@ -927,6 +970,7 @@ int i2c_dw_probe_master(struct dw_i2c_dev *dev)
 		dev_err(dev->dev, "failure adding adapter: %d\n", ret);
 	pm_runtime_put_noidle(dev->dev);
 
+	i2c_dw_configure_gpio(dev);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(i2c_dw_probe_master);

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -22,6 +22,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
@@ -31,6 +32,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/suspend.h>
+#include <linux/gpio-starfive-vic.h>
 
 #include "i2c-designware-core.h"
 
@@ -220,6 +222,7 @@ static const struct dmi_system_id dw_i2c_hwmon_class_dmi[] = {
 
 static int dw_i2c_plat_probe(struct platform_device *pdev)
 {
+	struct device_node *np = pdev->dev.of_node;
 	struct i2c_adapter *adap;
 	struct dw_i2c_dev *dev;
 	struct i2c_timings *t;
@@ -236,6 +239,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 	dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
 	dev->dev = &pdev->dev;
 	dev->irq = irq;
+	dev->scl_gpio = of_get_named_gpio(np, "scl-gpio", 0);
+	dev->sda_gpio = of_get_named_gpio(np, "sda-gpio", 0);
 	platform_set_drvdata(pdev, dev);
 
 	ret = dw_i2c_plat_request_regs(dev);