[PATCH 08/13 v2] clk: add ARM syscon ICST device tree bindings

[PATCH 08/13 v2] clk: add ARM syscon ICST device tree bindings

[Linus Walleij]

This adds the device tree bindings for the ARM Syscon ICST
oscillators, which is a register-level interface to the
Integrated Device Technology (IDT) ICS525 and ICS307
serially programmable oscillators.

Cc: devicetree@vger.kernel.org
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Spelling fixes.

I'm looking for an ACK from the CLK maintainers to take this
through the ARM SoC tree once the series stabilize.
---
 .../devicetree/bindings/clock/arm-syscon-icst.txt  | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/arm-syscon-icst.txt

diff --git a/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt b/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
new file mode 100644
index 000000000000..8b7177cecb36
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
@@ -0,0 +1,40 @@
+ARM System Controller ICST clocks
+
+The ICS525 and ICS307 oscillators are produced by Integrated Devices
+Technology (IDT). ARM integrated these oscillators deeply into their
+reference designs by adding special control registers that manage such
+oscillators to their system controllers.
+
+The ARM system controller contains logic to serialize and initialize
+an ICST clock request after a write to the 32 bit register at an offset
+into the system controller. Furthermore, to even be able to alter one of
+these frequencies, the system controller must first be unlocked by
+writing a special token to another offset in the system controller.
+
+The ICST oscillator must be provided inside a system controller node.
+
+Required properties:
+- lock-offset: the offset address into the system controller where the
+  unlocking register is located
+- vco-offset: the offset address into the system controller where the
+  ICST control register is located (even 32 bit address)
+- compatible: must be one of "arm,syscon-icst525" or "arm,syscon-icst307"
+- #clock-cells: must be <0>
+- clocks: parent clock, since the ICST needs a parent clock to derive its
+  frequency from, this attribute is compulsory.
+
+Example:
+
+syscon: syscon@10000000 {
+	compatible = "syscon";
+	reg = <0x10000000 0x1000>;
+
+	oscclk0: osc0@0c {
+		compatible = "arm,syscon-icst307";
+		#clock-cells = <0>;
+		lock-offset = <0x20>;
+		vco-offset = <0x0c>;
+		clocks = <&xtal24mhz>;
+	};
+	(...)
+};
-- 
2.4.3

Re: [PATCH 08/13 v2] clk: add ARM syscon ICST device tree bindings

[Rob Herring]

On Mon, Oct 26, 2015 at 8:33 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> This adds the device tree bindings for the ARM Syscon ICST
> oscillators, which is a register-level interface to the
> Integrated Device Technology (IDT) ICS525 and ICS307
> serially programmable oscillators.
>
> Cc: devicetree@vger.kernel.org
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Cc: linux-clk@vger.kernel.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Acked-by: Rob Herring <robh@kernel.org>

> ---
> ChangeLog v1->v2:
> - Spelling fixes.
>
> I'm looking for an ACK from the CLK maintainers to take this
> through the ARM SoC tree once the series stabilize.
> ---
>  .../devicetree/bindings/clock/arm-syscon-icst.txt  | 40 ++++++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
>
> diff --git a/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt b/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
> new file mode 100644
> index 000000000000..8b7177cecb36
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
> @@ -0,0 +1,40 @@
> +ARM System Controller ICST clocks
> +
> +The ICS525 and ICS307 oscillators are produced by Integrated Devices
> +Technology (IDT). ARM integrated these oscillators deeply into their
> +reference designs by adding special control registers that manage such
> +oscillators to their system controllers.
> +
> +The ARM system controller contains logic to serialize and initialize
> +an ICST clock request after a write to the 32 bit register at an offset
> +into the system controller. Furthermore, to even be able to alter one of
> +these frequencies, the system controller must first be unlocked by
> +writing a special token to another offset in the system controller.
> +
> +The ICST oscillator must be provided inside a system controller node.
> +
> +Required properties:
> +- lock-offset: the offset address into the system controller where the
> +  unlocking register is located
> +- vco-offset: the offset address into the system controller where the
> +  ICST control register is located (even 32 bit address)
> +- compatible: must be one of "arm,syscon-icst525" or "arm,syscon-icst307"
> +- #clock-cells: must be <0>
> +- clocks: parent clock, since the ICST needs a parent clock to derive its
> +  frequency from, this attribute is compulsory.
> +
> +Example:
> +
> +syscon: syscon@10000000 {
> +       compatible = "syscon";
> +       reg = <0x10000000 0x1000>;
> +
> +       oscclk0: osc0@0c {
> +               compatible = "arm,syscon-icst307";
> +               #clock-cells = <0>;
> +               lock-offset = <0x20>;
> +               vco-offset = <0x0c>;
> +               clocks = <&xtal24mhz>;
> +       };
> +       (...)
> +};
> --
> 2.4.3
>
> --
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Re: [PATCH 08/13 v2] clk: add ARM syscon ICST device tree bindings

[Stephen Boyd]

On 10/26, Linus Walleij wrote:
> This adds the device tree bindings for the ARM Syscon ICST
> oscillators, which is a register-level interface to the
> Integrated Device Technology (IDT) ICS525 and ICS307
> serially programmable oscillators.
> 
> Cc: devicetree@vger.kernel.org
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Cc: linux-clk@vger.kernel.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---

Acked-by: Stephen Boyd <sboyd@codeaurora.org>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH 08/13 v2] clk: add ARM syscon ICST device tree bindings

[Linus Walleij]

This adds the device tree bindings for the ARM Syscon ICST
oscillators, which is a register-level interface to the
Integrated Device Technology (IDT) ICS525 and ICS307
serially programmable oscillators.

Cc: devicetree@vger.kernel.org
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: linux-clk@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Spelling fixes.

I'm looking for an ACK from the CLK maintainers to take this
through the ARM SoC tree once the series stabilize.
---
 .../devicetree/bindings/clock/arm-syscon-icst.txt  | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/arm-syscon-icst.txt

diff --git a/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt b/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
new file mode 100644
index 000000000000..8b7177cecb36
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/arm-syscon-icst.txt
@@ -0,0 +1,40 @@
+ARM System Controller ICST clocks
+
+The ICS525 and ICS307 oscillators are produced by Integrated Devices
+Technology (IDT). ARM integrated these oscillators deeply into their
+reference designs by adding special control registers that manage such
+oscillators to their system controllers.
+
+The ARM system controller contains logic to serialize and initialize
+an ICST clock request after a write to the 32 bit register at an offset
+into the system controller. Furthermore, to even be able to alter one of
+these frequencies, the system controller must first be unlocked by
+writing a special token to another offset in the system controller.
+
+The ICST oscillator must be provided inside a system controller node.
+
+Required properties:
+- lock-offset: the offset address into the system controller where the
+  unlocking register is located
+- vco-offset: the offset address into the system controller where the
+  ICST control register is located (even 32 bit address)
+- compatible: must be one of "arm,syscon-icst525" or "arm,syscon-icst307"
+- #clock-cells: must be <0>
+- clocks: parent clock, since the ICST needs a parent clock to derive its
+  frequency from, this attribute is compulsory.
+
+Example:
+
+syscon: syscon@10000000 {
+	compatible = "syscon";
+	reg = <0x10000000 0x1000>;
+
+	oscclk0: osc0@0c {
+		compatible = "arm,syscon-icst307";
+		#clock-cells = <0>;
+		lock-offset = <0x20>;
+		vco-offset = <0x0c>;
+		clocks = <&xtal24mhz>;
+	};
+	(...)
+};
-- 
2.4.3

Re: [PATCH 08/13 v2] clk: add ARM syscon ICST device tree bindings

[Stephen Boyd]

On 10/23, Linus Walleij wrote:
> This adds the device tree bindings for the ARM Syscon ICST
> oscillators, which is a register-level interface to the
> Integrated Device Technology (IDT) ICS525 and ICS307
> serially programmable oscillators.
> 
> Cc: devicetree@vger.kernel.org
> Cc: Michael Turquette <mturquette@baylibre.com>
> Cc: Stephen Boyd <sboyd@codeaurora.org>
> Cc: linux-clk@vger.kernel.org
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---

Acked-by: Stephen Boyd <sboyd@codeaurora.org>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project