From 622597dee4f66d5bd7dd5135d770077af04b0349 Mon Sep 17 00:00:00 2001 From: Dinh Nguyen Date: Wed, 4 Apr 2018 17:18:24 -0500 Subject: [PATCH] i2c: designware: add reset ctrl to driver Add code to look for a reset manager property. Specifically, look for the reset-names of 'i2c'. A reset property is an optional feature, so only print out a warning and do not fail if a reset property is not present. If a reset property is discovered, then use it to deassert, thus bringing the IP out of reset. Signed-off-by: Dinh Nguyen --- drivers/i2c/designware_i2c.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index 8cfed21..419d021 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include "designware_i2c.h" @@ -34,6 +35,7 @@ static struct dw_scl_sda_cfg byt_config = { struct dw_i2c { struct i2c_regs *regs; struct dw_scl_sda_cfg *scl_sda_cfg; + struct reset_ctl reset_ctl; }; #ifdef CONFIG_SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED @@ -534,6 +536,7 @@ static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr, static int designware_i2c_probe(struct udevice *bus) { struct dw_i2c *priv = dev_get_priv(bus); + int ret; if (device_is_on_pci_bus(bus)) { #ifdef CONFIG_DM_PCI @@ -549,6 +552,13 @@ static int designware_i2c_probe(struct udevice *bus) priv->regs = (struct i2c_regs *)devfdt_get_addr_ptr(bus); } + ret = reset_get_by_name(bus, "i2c", &priv->reset_ctl); + if (ret) + pr_info("reset_get_by_name() failed: %d\n", ret); + + if (&priv->reset_ctl) + reset_deassert(&priv->reset_ctl); + __dw_i2c_init(priv->regs, 0, 0); return 0;