meson: use the clock driver

Use the clk framework to initialize clocks from drivers that need them
instead of having hardcoded frequencies and initializations from board
code.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

arch/arm/include/asm/arch-meson/gx.h

@@ -56,14 +56,4 @@
 /* Ethernet memory power domain */
 #define GX_MEM_PD_REG_0_ETH_MASK	(BIT(2) | BIT(3))
 
-/* Clock gates */
-#define GX_GCLK_MPEG_0	GX_HIU_ADDR(0x50)
-#define GX_GCLK_MPEG_1	GX_HIU_ADDR(0x51)
-#define GX_GCLK_MPEG_2	GX_HIU_ADDR(0x52)
-#define GX_GCLK_MPEG_OTHER	GX_HIU_ADDR(0x53)
-#define GX_GCLK_MPEG_AO	GX_HIU_ADDR(0x54)
-
-#define GX_GCLK_MPEG_0_I2C   BIT(9)
-#define GX_GCLK_MPEG_1_ETH	BIT(3)
-
 #endif /* __GX_H__ */

arch/arm/mach-meson/eth.c

@@ -48,7 +48,6 @@ void meson_gx_eth_init(phy_interface_t mode, unsigned int flags)
 		return;
 	}
 
-	/* Enable power and clock gate */
-	setbits_le32(GX_GCLK_MPEG_1, GX_GCLK_MPEG_1_ETH);
+	/* Enable power gate */
 	clrbits_le32(GX_MEM_PD_REG_0, GX_MEM_PD_REG_0_ETH_MASK);
 }

board/amlogic/libretech-cc/libretech-cc.c

@@ -32,10 +32,6 @@ int misc_init_r(void)
 	meson_gx_eth_init(PHY_INTERFACE_MODE_RMII,
 			  MESON_GXL_USE_INTERNAL_RMII_PHY);
 
-	/* Enable power and clock gate */
-	setbits_le32(GX_GCLK_MPEG_1, GX_GCLK_MPEG_1_ETH);
-	clrbits_le32(GX_MEM_PD_REG_0, GX_MEM_PD_REG_0_ETH_MASK);
-
 	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
 		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
 					  mac_addr, EFUSE_MAC_SIZE);

board/amlogic/odroid-c2/odroid-c2.c

@@ -30,9 +30,6 @@ int misc_init_r(void)
 
 	meson_gx_eth_init(PHY_INTERFACE_MODE_RGMII, 0);
 
-	/* Enable power and clock gate */
-	setbits_le32(GX_GCLK_MPEG_0, GX_GCLK_MPEG_0_I2C);
-
 	/* Reset PHY on GPIOZ_14 */
 	clrbits_le32(GX_GPIO_EN(3), BIT(14));
 	clrbits_le32(GX_GPIO_OUT(3), BIT(14));

drivers/i2c/meson_i2c.c

@@ -3,8 +3,8 @@
  * (C) Copyright 2017 - Beniamino Galvani <b.galvani@gmail.com>
  */
 #include <common.h>
-#include <asm/arch/i2c.h>
 #include <asm/io.h>
+#include <clk.h>
 #include <dm.h>
 #include <i2c.h>
 
@@ -42,6 +42,7 @@ struct i2c_regs {
 };
 
 struct meson_i2c {
+	struct clk clk;
 	struct i2c_regs *regs;
 	struct i2c_msg *msg;	/* Current I2C message */
 	bool last;		/* Whether the message is the last */
@@ -221,9 +222,13 @@ static int meson_i2c_xfer(struct udevice *bus, struct i2c_msg *msg,
 static int meson_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
 {
 	struct meson_i2c *i2c = dev_get_priv(bus);
-	unsigned int clk_rate = MESON_I2C_CLK_RATE;
+	ulong clk_rate;
 	unsigned int div;
 
+	clk_rate = clk_get_rate(&i2c->clk);
+	if (IS_ERR_VALUE(clk_rate))
+		return -EINVAL;
+
 	div = DIV_ROUND_UP(clk_rate, speed * 4);
 
 	/* clock divider has 12 bits */
@@ -238,7 +243,7 @@ static int meson_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
 	clrsetbits_le32(&i2c->regs->ctrl, REG_CTRL_CLKDIVEXT_MASK,
 			(div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT);
 
-	debug("meson i2c: set clk %u, src %u, div %u\n", speed, clk_rate, div);
+	debug("meson i2c: set clk %u, src %lu, div %u\n", speed, clk_rate, div);
 
 	return 0;
 }
@@ -246,6 +251,15 @@ static int meson_i2c_set_bus_speed(struct udevice *bus, unsigned int speed)
 static int meson_i2c_probe(struct udevice *bus)
 {
 	struct meson_i2c *i2c = dev_get_priv(bus);
+	int ret;
+
+	ret = clk_get_by_index(bus, 0, &i2c->clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_enable(&i2c->clk);
+	if (ret)
+		return ret;
 
 	i2c->regs = dev_read_addr_ptr(bus);
 	clrbits_le32(&i2c->regs->ctrl, REG_CTRL_START);