From 06cec894a5c37e79afd81eaaec7f1325b55f3e32 Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel@sholland.org>
Date: Sun, 12 Sep 2021 10:21:39 -0500
Subject: [PATCH] i2c: mvtwsi: Add support for DM clocks and resets
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>
---
drivers/i2c/mvtwsi.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/i2c/mvtwsi.c b/drivers/i2c/mvtwsi.c
index d33e2c7c9d..236bfb8d8e 100644
--- a/drivers/i2c/mvtwsi.c
+++ b/drivers/i2c/mvtwsi.c
@@ -17,7 +17,9 @@
#include <linux/bitops.h>
#include <linux/compat.h>
#if CONFIG_IS_ENABLED(DM_I2C)
+#include <clk.h>
#include <dm.h>
+#include <reset.h>
#endif
DECLARE_GLOBAL_DATA_PTR;
@@ -835,7 +837,18 @@ static int mvtwsi_i2c_bind(struct udevice *bus)
static int mvtwsi_i2c_probe(struct udevice *bus)
{
struct mvtwsi_i2c_dev *dev = dev_get_priv(bus);
+ struct reset_ctl reset;
+ struct clk clk;
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);
dev->speed = actual_speed;
--
2.39.5