clk: at91: Add clock driver
The patch is referred to at91 clock driver of Linux, to make
the clock node descriptions in DT aligned with the Linux's.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
new file mode 100644
index 0000000..f7666b4
--- /dev/null
+++ b/drivers/clk/at91/clk-slow.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2016 Atmel Corporation
+ * Wenyou.Yang <wenyou.yang@atmel.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk-uclass.h>
+#include <dm/device.h>
+
+static int at91_slow_clk_enable(struct clk *clk)
+{
+ return 0;
+}
+
+static ulong at91_slow_clk_get_rate(struct clk *clk)
+{
+ return CONFIG_SYS_AT91_SLOW_CLOCK;
+}
+
+static struct clk_ops at91_slow_clk_ops = {
+ .enable = at91_slow_clk_enable,
+ .get_rate = at91_slow_clk_get_rate,
+};
+
+static const struct udevice_id at91_slow_clk_match[] = {
+ { .compatible = "atmel,at91sam9x5-clk-slow" },
+ {}
+};
+
+U_BOOT_DRIVER(at91_slow_clk) = {
+ .name = "at91-slow-clk",
+ .id = UCLASS_CLK,
+ .of_match = at91_slow_clk_match,
+ .ops = &at91_slow_clk_ops,
+};