zephyr: shim the keyboard scan

It shims the keyboard_scan task by introducing another keyboard_raw.c
which calls down to the zephyr-chrome cros_kb_raw driver.

BRANCH=none
BUG=b:167405015
TEST=Build pass by zmake configure -B ./build projects/experimental/volteer.
TEST=Check all the keys on volteer platform by "ksstate".

Change-Id: Ic87f67c28779f7feafa350020a07ba87e3600ecd
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Wealian Liao <whliao@nuvoton.corp-partner.google.com>
Signed-off-by: Mulin Chao <MLChao@nuvoton.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2523839
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/zephyr/shim/chip/npcx/clock.c b/zephyr/shim/chip/npcx/clock.c
new file mode 100644
index 0000000000..8321d5f6d3
--- /dev/null
+++ b/zephyr/shim/chip/npcx/clock.c
@@ -0,0 +1,31 @@
+/* Copyright 2020 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <device.h>
+#include <drivers/clock_control.h>
+#include <dt-bindings/clock/npcx_clock.h>
+#include <kernel.h>
+#include <logging/log.h>
+#include <soc.h>
+#include <zephyr.h>
+
+LOG_MODULE_REGISTER(shim_clock, LOG_LEVEL_ERR);
+
+int clock_get_freq(void)
+{
+	const struct device *clk_dev = device_get_binding(NPCX_CLK_CTRL_NAME);
+	const struct npcx_clk_cfg clk_cfg = {
+		.bus = NPCX_CLOCK_BUS_CORE,
+	};
+	uint32_t rate;
+
+	if (clock_control_get_rate(clk_dev, (clock_control_subsys_t *)&clk_cfg,
+				   &rate) != 0) {
+		LOG_ERR("Get %s clock rate error", clk_dev->name);
+		return -EIO;
+	}
+
+	return rate;
+}