From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: narmstrong@baylibre.com, jbrunet@baylibre.com,
linux-amlogic@lists.infradead.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
sboyd@kernel.org,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Rob Herring <robh@kernel.org>
Subject: [PATCH v3 1/2] dt-bindings: clock: add the Amlogic Meson8 DDR clock controller binding
Date: Sun, 17 Nov 2019 15:07:30 +0100 [thread overview]
Message-ID: <20191117140731.137378-2-martin.blumenstingl@googlemail.com> (raw)
In-Reply-To: <20191117140731.137378-1-martin.blumenstingl@googlemail.com>
Amlogic Meson8, Meson8b and Meson8m2 SoCs have a DDR clock controller in
the MMCBUS registers. There is no public documentation on this, but the
GPL u-boot sources from the Amlogic BSP show that:
- it uses the same XTAL input as the main clock controller
- it contains a PLL which seems to be implemented just like the other
PLLs in this SoC
- there is a power-of-two PLL post-divider
Add the documentation and header file for this DDR clock controller.
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
.../clock/amlogic,meson8-ddr-clkc.yaml | 50 +++++++++++++++++++
include/dt-bindings/clock/meson8-ddr-clkc.h | 4 ++
2 files changed, 54 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml
create mode 100644 include/dt-bindings/clock/meson8-ddr-clkc.h
diff --git a/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml b/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml
new file mode 100644
index 000000000000..4b8669f870ec
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/amlogic,meson8-ddr-clkc.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/amlogic,meson8-ddr-clkc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic DDR Clock Controller Device Tree Bindings
+
+maintainers:
+ - Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+
+properties:
+ compatible:
+ enum:
+ - amlogic,meson8-ddr-clkc
+ - amlogic,meson8b-ddr-clkc
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ clock-names:
+ items:
+ - const: xtal
+
+ "#clock-cells":
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ ddr_clkc: clock-controller@400 {
+ compatible = "amlogic,meson8-ddr-clkc";
+ reg = <0x400 0x20>;
+ clocks = <&xtal>;
+ clock-names = "xtal";
+ #clock-cells = <1>;
+ };
+
+...
diff --git a/include/dt-bindings/clock/meson8-ddr-clkc.h b/include/dt-bindings/clock/meson8-ddr-clkc.h
new file mode 100644
index 000000000000..a8e0fa2987ab
--- /dev/null
+++ b/include/dt-bindings/clock/meson8-ddr-clkc.h
@@ -0,0 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#define DDR_CLKID_DDR_PLL_DCO 0
+#define DDR_CLKID_DDR_PLL 1
--
2.24.0
next prev parent reply other threads:[~2019-11-17 14:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-17 14:07 [PATCH v3 0/2] add the DDR clock controller on Meson8 and Meson8b Martin Blumenstingl
2019-11-17 14:07 ` Martin Blumenstingl [this message]
2019-11-17 14:07 ` [PATCH v3 2/2] clk: meson: add a driver for the Meson8/8b/8m2 DDR clock controller Martin Blumenstingl
2019-11-18 9:55 ` [PATCH v3 0/2] add the DDR clock controller on Meson8 and Meson8b Jerome Brunet
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