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i2c: lpc32xx: add support for OTG I2C

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Updated the LPC32xx I2C driver to support
the OTG I2C that is part of the USB module.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Sylvain Lemieux 2015-08-04 17:04:41 -04:00 committed by Tom Rini
parent 30cb3bf4a9
commit 1933af15e2
1 changed files with 17 additions and 3 deletions
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20
drivers/i2c/lpc32xx_i2c.c
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@ -1,7 +1,7 @@
/*
* LPC32xx I2C interface driver
*
* (C) Copyright 2014 DENX Software Engineering GmbH
* (C) Copyright 2014-2015 DENX Software Engineering GmbH
* Written-by: Albert ARIBAUD - 3ADEV <albert.aribaud@3adev.fr>
*
* SPDX-License-Identifier: GPL-2.0+
@ -60,7 +60,8 @@ struct lpc32xx_i2c_registers {
static struct lpc32xx_i2c_registers *lpc32xx_i2c[] = {
(struct lpc32xx_i2c_registers *)I2C1_BASE,
(struct lpc32xx_i2c_registers *)I2C2_BASE
(struct lpc32xx_i2c_registers *)I2C2_BASE,
(struct lpc32xx_i2c_registers *)(USB_BASE + 0x300)
};
/* Set I2C bus speed */
@ -68,11 +69,17 @@ static unsigned int lpc32xx_i2c_set_bus_speed(struct i2c_adapter *adap,
unsigned int speed)
{
int half_period;
int clk_rate;
if (speed == 0)
return -EINVAL;
half_period = (get_hclk_clk_rate() / speed) / 2;
if (adap->hwadapnr == 2)
/* OTG I2C clock source is different. */
clk_rate = get_periph_clk_rate();
else
clk_rate = get_hclk_clk_rate();
half_period = (clk_rate / speed) / 2;
if ((half_period > 255) || (half_period < 0))
return -EINVAL;
@ -249,3 +256,10 @@ U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_1, _i2c_init, lpc32xx_i2c_probe,
CONFIG_SYS_I2C_LPC32XX_SPEED,
CONFIG_SYS_I2C_LPC32XX_SLAVE,
1)
U_BOOT_I2C_ADAP_COMPLETE(lpc32xx_2, _i2c_init, NULL,
lpc32xx_i2c_read, lpc32xx_i2c_write,
lpc32xx_i2c_set_bus_speed,
100000,
0,
2)