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i2c: mvtwsi: Add support for DM clocks and resets

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The controller may need to have clocks/resets enabled for it to work.
Add support for this. Since the clocks/resets are optional on some
platforms (per the device tree binding), do not prevent probing the
controller if they are missing.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Samuel Holland 2021-09-12 10:21:39 -05:00 • committed by Heiko Schocher
parent e53979cd34
commit 06cec894a5
1 changed files with 13 additions and 0 deletions
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13
drivers/i2c/mvtwsi.c
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@ -17,7 +17,9 @@
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/compat.h> #include <linux/compat.h>
#if CONFIG_IS_ENABLED(DM_I2C) #if CONFIG_IS_ENABLED(DM_I2C)
#include <clk.h>
#include <dm.h> #include <dm.h>
#include <reset.h>
#endif #endif
DECLARE_GLOBAL_DATA_PTR; DECLARE_GLOBAL_DATA_PTR;
@ -835,7 +837,18 @@ static int mvtwsi_i2c_bind(struct udevice *bus)
static int mvtwsi_i2c_probe(struct udevice *bus) static int mvtwsi_i2c_probe(struct udevice *bus)
{ {
struct mvtwsi_i2c_dev *dev = dev_get_priv(bus); struct mvtwsi_i2c_dev *dev = dev_get_priv(bus);
struct reset_ctl reset;
struct clk clk;
uint actual_speed; uint actual_speed;
int ret;
ret = reset_get_by_index(bus, 0, &reset);
if (!ret)
reset_deassert(&reset);
ret = clk_get_by_index(bus, 0, &clk);
if (!ret)
clk_enable(&clk);
__twsi_i2c_init(dev->base, dev->speed, dev->slaveadd, &actual_speed); __twsi_i2c_init(dev->base, dev->speed, dev->slaveadd, &actual_speed);
dev->speed = actual_speed; dev->speed = actual_speed;