clk: meson: add minimal driver for g12a-ao clocks

Add minimal driver AO clocks on meson G12A family. Only ADC related clocks
are supported.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: I0c91848bc55493e19570db333e7da6020d687907

diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
index c873d69..7204383 100644 (file)
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -6,4 +6,5 @@
 obj-$(CONFIG_CLK_MESON_GX) += gxbb.o
 obj-$(CONFIG_CLK_MESON_AXG) += axg.o
 obj-$(CONFIG_CLK_MESON_G12A) += g12a.o
+obj-$(CONFIG_CLK_MESON_G12A) += g12a-ao.o
 

diff --git a/drivers/clk/meson/g12a-ao.c b/drivers/clk/meson/g12a-ao.c
new file mode 100644 (file)
index 0000000..7a0abea
--- /dev/null
+++ b/drivers/clk/meson/g12a-ao.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <common.h>
+#include <log.h>
+#include <asm/io.h>
+#include <clk-uclass.h>
+#include <dm.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <dt-bindings/clock/g12a-aoclkc.h>
+
+#include "clk_meson.h"
+
+struct meson_clk {
+       struct regmap *map;
+};
+
+#define AO_CLK_GATE0           0x4c
+#define AO_SAR_CLK             0x90
+
+static struct meson_gate gates[] = {
+       MESON_GATE(CLKID_AO_SAR_ADC, AO_CLK_GATE0, 8),
+       MESON_GATE(CLKID_AO_SAR_ADC_CLK, AO_SAR_CLK, 8),
+};
+
+static int meson_set_gate(struct clk *clk, bool on)
+{
+       struct meson_clk *priv = dev_get_priv(clk->dev);
+       struct meson_gate *gate;
+
+       if (clk->id >= ARRAY_SIZE(gates))
+               return -ENOENT;
+
+       gate = &gates[clk->id];
+
+       if (gate->reg == 0)
+               return 0;
+
+       regmap_update_bits(priv->map, gate->reg,
+                          BIT(gate->bit), on ? BIT(gate->bit) : 0);
+
+       return 0;
+}
+
+static int meson_clk_enable(struct clk *clk)
+{
+       return meson_set_gate(clk, true);
+}
+
+static int meson_clk_disable(struct clk *clk)
+{
+       return meson_set_gate(clk, false);
+}
+
+static int meson_clk_probe(struct udevice *dev)
+{
+       struct meson_clk *priv = dev_get_priv(dev);
+
+       priv->map = syscon_node_to_regmap(dev_get_parent(dev)->node);
+       if (IS_ERR(priv->map))
+               return PTR_ERR(priv->map);
+
+       return 0;
+}
+
+static struct clk_ops meson_clk_ops = {
+       .disable        = meson_clk_disable,
+       .enable         = meson_clk_enable,
+};
+
+static const struct udevice_id meson_clk_ids[] = {
+       { .compatible = "amlogic,meson-g12a-aoclkc" },
+       { }
+};
+
+U_BOOT_DRIVER(meson_clk_axg) = {
+       .name           = "meson_clk_g12a_ao",
+       .id             = UCLASS_CLK,
+       .of_match       = meson_clk_ids,
+       .priv_auto_alloc_size = sizeof(struct meson_clk),
+       .ops            = &meson_clk_ops,
+       .probe          = meson_clk_probe,
+};