From 9078b67f3c968cbc3142432decc93a51780b4642 Mon Sep 17 00:00:00 2001
From: Samuel Holland <samuel@sholland.org>
Date: Sun, 7 Feb 2021 23:57:19 -0600
Subject: [PATCH] clk: sunxi: Add a dummy clock driver for the RTC
The 32kHz clock ("LOSC") on sunxi SoCs is provided by the RTC. It is
used, among other things, by the XHCI controller in the H6. To be able
to call clk_get_bulk() on the XHCI controller, some device needs to
provide all referenced clocks.
Since LOSC is a fixed-rate always-on clock, implementation is trivial.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
drivers/clk/sunxi/Makefile | 2 ++
drivers/clk/sunxi/clk_sun6i_rtc.c | 35 +++++++++++++++++++++++++++++++
2 files changed, 37 insertions(+)
create mode 100644 drivers/clk/sunxi/clk_sun6i_rtc.c
diff --git a/drivers/clk/sunxi/Makefile b/drivers/clk/sunxi/Makefile
index 0dfc0593fb..4f9282a8b9 100644
--- a/drivers/clk/sunxi/Makefile
+++ b/drivers/clk/sunxi/Makefile
@@ -6,6 +6,8 @@
obj-$(CONFIG_CLK_SUNXI) += clk_sunxi.o
+obj-$(CONFIG_CLK_SUNXI) += clk_sun6i_rtc.o
+
obj-$(CONFIG_CLK_SUN4I_A10) += clk_a10.o
obj-$(CONFIG_CLK_SUN5I_A10S) += clk_a10s.o
obj-$(CONFIG_CLK_SUN6I_A31) += clk_a31.o
diff --git a/drivers/clk/sunxi/clk_sun6i_rtc.c b/drivers/clk/sunxi/clk_sun6i_rtc.c
new file mode 100644
index 0000000000..0c280d221b
--- /dev/null
+++ b/drivers/clk/sunxi/clk_sun6i_rtc.c
@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2018 Amarula Solutions.
+ * Copyright (C) 2020 Samuel Holland <samuel@sholland.org>
+ */
+
+#include <clk-uclass.h>
+#include <dm.h>
+
+static int clk_sun6i_rtc_enable(struct clk *clk)
+{
+ return 0;
+}
+
+static const struct clk_ops clk_sun6i_rtc_ops = {
+ .enable = clk_sun6i_rtc_enable,
+};
+
+static const struct udevice_id sun6i_rtc_ids[] = {
+ { .compatible = "allwinner,sun6i-a31-rtc" },
+ { .compatible = "allwinner,sun8i-a23-rtc" },
+ { .compatible = "allwinner,sun8i-h3-rtc" },
+ { .compatible = "allwinner,sun8i-r40-rtc" },
+ { .compatible = "allwinner,sun8i-v3-rtc" },
+ { .compatible = "allwinner,sun50i-h5-rtc" },
+ { .compatible = "allwinner,sun50i-h6-rtc" },
+ { }
+};
+
+U_BOOT_DRIVER(clk_sun6i_rtc) = {
+ .name = "clk_sun6i_rtc",
+ .id = UCLASS_CLK,
+ .of_match = sun6i_rtc_ids,
+ .ops = &clk_sun6i_rtc_ops,
+};
--
2.39.5