arm: am335x: add support for i2c2 bus

The am335x from BeagleBone use i2c EEPROM to detect capes.
The memory is wired to i2c bus 2 therefore it need to be enabled.

Add i2c2 clock, pinmux description and pinmux enable function.
Signed-off-by: NKory Maincent <kory.maincent@bootlin.com>

arch/arm/mach-omap2/am33xx/clock_am33xx.c

@@ -220,6 +220,7 @@ void enable_basic_clocks(void)
 		&cmper->gpio2clkctrl,
 		&cmper->gpio3clkctrl,
 		&cmper->i2c1clkctrl,
+		&cmper->i2c2clkctrl,
 		&cmper->cpgmac0clkctrl,
 		&cmper->spi0clkctrl,
 		&cmrtc->rtcclkctrl,

board/ti/am335x/board.c

@@ -77,8 +77,10 @@ static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
 void do_board_detect(void)
 {
 	enable_i2c0_pin_mux();
+	enable_i2c2_pin_mux();
 #if !CONFIG_IS_ENABLED(DM_I2C)
 	i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED, CONFIG_SYS_OMAP24_I2C_SLAVE);
+	i2c_init(CONFIG_SYS_OMAP24_I2C_SPEED2, CONFIG_SYS_OMAP24_I2C_SLAVE2);
 #endif
 	if (ti_i2c_eeprom_am_get(CONFIG_EEPROM_BUS_ADDRESS,
 				 CONFIG_EEPROM_CHIP_ADDRESS))

board/ti/am335x/board.h

@@ -93,5 +93,6 @@ void enable_uart3_pin_mux(void);
 void enable_uart4_pin_mux(void);
 void enable_uart5_pin_mux(void);
 void enable_i2c0_pin_mux(void);
+void enable_i2c2_pin_mux(void);
 void enable_board_pin_mux(void);
 #endif

board/ti/am335x/mux.c

@@ -124,6 +124,14 @@ static struct module_pin_mux i2c1_pin_mux[] = {
 	{-1},
 };
 
+static struct module_pin_mux i2c2_pin_mux[] = {
+	{OFFSET(uart1_ctsn), (MODE(3) | RXACTIVE |
+			PULLUDEN | PULLUP_EN | SLEWCTRL)},	/* I2C_DATA */
+	{OFFSET(uart1_rtsn), (MODE(3) | RXACTIVE |
+			PULLUDEN | PULLUP_EN | SLEWCTRL)},	/* I2C_SCLK */
+	{-1},
+};
+
 static struct module_pin_mux spi0_pin_mux[] = {
 	{OFFSET(spi0_sclk), (MODE(0) | RXACTIVE | PULLUDEN)},	/* SPI0_SCLK */
 	{OFFSET(spi0_d0), (MODE(0) | RXACTIVE |
@@ -308,6 +316,11 @@ void enable_i2c0_pin_mux(void)
 	configure_module_pin_mux(i2c0_pin_mux);
 }
 
+void enable_i2c2_pin_mux(void)
+{
+	configure_module_pin_mux(i2c2_pin_mux);
+}
+
 /*
  * The AM335x GP EVM, if daughter card(s) are connected, can have 8
  * different profiles.  These profiles determine what peripherals are
@@ -367,6 +380,7 @@ void enable_board_pin_mux(void)
 #else
 		configure_module_pin_mux(mmc1_pin_mux);
 #endif
+		configure_module_pin_mux(i2c2_pin_mux);
 	} else if (board_is_gp_evm()) {
 		/* General Purpose EVM */
 		unsigned short profile = detect_daughter_board_profile();
@@ -411,6 +425,7 @@ void enable_board_pin_mux(void)
 #else
 		configure_module_pin_mux(mmc1_pin_mux);
 #endif
+		configure_module_pin_mux(i2c2_pin_mux);
 	} else if (board_is_pb()) {
 		configure_module_pin_mux(mii1_pin_mux);
 		configure_module_pin_mux(mmc0_pin_mux);