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i2c: designware_i2c: Read device-tree properties

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The i2c controller defines a few timing properties. Read these in and
store them for use by the driver.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Simon Glass 2020-01-23 11:48:11 -07:00 • committed by Heiko Schocher
parent 9bb743d9c7
commit 80a03db4f3
3 changed files with 22 additions and 3 deletions
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8
drivers/i2c/designware_i2c.c
View file

@ -535,11 +535,15 @@ static int designware_i2c_probe_chip(struct udevice *bus, uint chip_addr,
return ret;
}
static int designware_i2c_ofdata_to_platdata(struct udevice *bus)
int designware_i2c_ofdata_to_platdata(struct udevice *bus)
{
struct dw_i2c *priv = dev_get_priv(bus);
priv->regs = (struct i2c_regs *)devfdt_get_addr_ptr(bus);
if (!priv->regs)
priv->regs = (struct i2c_regs *)devfdt_get_addr_ptr(bus);
dev_read_u32(bus, "i2c-scl-rising-time-ns", &priv->scl_rise_time_ns);
dev_read_u32(bus, "i2c-scl-falling-time-ns", &priv->scl_fall_time_ns);
dev_read_u32(bus, "i2c-sda-hold-time-ns", &priv->sda_hold_time_ns);
return 0;
}

15
drivers/i2c/designware_i2c.h
View file

@ -167,10 +167,24 @@ struct dw_scl_sda_cfg {
u32 sda_hold;
};
/**
* struct dw_i2c - private information for the bus
*
* @regs: Registers pointer
* @scl_sda_cfg: Deprecated information for x86 (should move to device tree)
* @resets: Resets for the I2C controller
* @scl_rise_time_ns: Configured SCL rise time in nanoseconds
* @scl_fall_time_ns: Configured SCL fall time in nanoseconds
* @sda_hold_time_ns: Configured SDA hold time in nanoseconds
* @clk: Clock input to the I2C controller
*/
struct dw_i2c {
struct i2c_regs *regs;
struct dw_scl_sda_cfg *scl_sda_cfg;
struct reset_ctl_bulk resets;
u32 scl_rise_time_ns;
u32 scl_fall_time_ns;
u32 sda_hold_time_ns;
#if CONFIG_IS_ENABLED(CLK)
struct clk clk;
#endif
@ -180,5 +194,6 @@ extern const struct dm_i2c_ops designware_i2c_ops;
int designware_i2c_probe(struct udevice *bus);
int designware_i2c_remove(struct udevice *dev);
int designware_i2c_ofdata_to_platdata(struct udevice *bus);
#endif /* __DW_I2C_H_ */

2
drivers/i2c/designware_i2c_pci.c
View file

@ -63,7 +63,7 @@ static int designware_i2c_pci_ofdata_to_platdata(struct udevice *dev)
/* Use BayTrail specific timing values */
priv->scl_sda_cfg = &byt_config;
return 0;
return designware_i2c_ofdata_to_platdata(dev);
}
static int designware_i2c_pci_probe(struct udevice *dev)