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devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v4 2/7] dt-bindings: clock: Document Exynos7885 CMU bindings Date: Mon, 6 Dec 2021 16:31:16 +0100 Message-Id: <20211206153124.427102-3-virag.david003@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211206153124.427102-1-virag.david003@gmail.com> References: <20211206153124.427102-1-virag.david003@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211206_073229_045161_8776435C X-CRM114-Status: GOOD ( 18.79 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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d19sm7364688edt.34.2021.12.06.07.32.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Dec 2021 07:32:26 -0800 (PST) From: David Virag Cc: Sam Protsenko , David Virag , Krzysztof Kozlowski , Rob Herring , Sylwester Nawrocki , Tomasz Figa , Chanwoo Choi , Michael Turquette , Stephen Boyd , linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org Subject: [PATCH v4 2/7] dt-bindings: clock: Document Exynos7885 CMU bindings Date: Mon, 6 Dec 2021 16:31:16 +0100 Message-Id: <20211206153124.427102-3-virag.david003@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211206153124.427102-1-virag.david003@gmail.com> References: <20211206153124.427102-1-virag.david003@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provide dt-schema documentation for Exynos7885 SoC clock controller. Description is modified from Exynos850 clock controller documentation as I couldn't describe it any better, that was written by Sam Protsenko. Reviewed-by: Krzysztof Kozlowski Signed-off-by: David Virag --- Changes in v2: - Fixed double : in description - Added R-b tag by Krzysztof Kozlowski Changes in v3: - Nothing Changes in v4: - Fix leading 0x in example. .../clock/samsung,exynos7885-clock.yaml | 166 ++++++++++++++++++ 1 file changed, 166 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/samsung,exynos7885-clock.yaml diff --git a/Documentation/devicetree/bindings/clock/samsung,exynos7885-clock.yaml b/Documentation/devicetree/bindings/clock/samsung,exynos7885-clock.yaml new file mode 100644 index 000000000000..7e5a9cac2fd2 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/samsung,exynos7885-clock.yaml @@ -0,0 +1,166 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/clock/samsung,exynos7885-clock.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Samsung Exynos7885 SoC clock controller + +maintainers: + - Dávid Virág + - Chanwoo Choi + - Krzysztof Kozlowski + - Sylwester Nawrocki + - Tomasz Figa + +description: | + Exynos7885 clock controller is comprised of several CMU units, generating + clocks for different domains. Those CMU units are modeled as separate device + tree nodes, and might depend on each other. The root clock in that root tree + is an external clock: OSCCLK (26 MHz). This external clock must be defined + as a fixed-rate clock in dts. + + CMU_TOP is a top-level CMU, where all base clocks are prepared using PLLs and + dividers; all other leaf clocks (other CMUs) are usually derived from CMU_TOP. + + Each clock is assigned an identifier and client nodes can use this identifier + to specify the clock which they consume. All clocks available for usage + in clock consumer nodes are defined as preprocessor macros in + 'dt-bindings/clock/exynos7885.h' header. + +properties: + compatible: + enum: + - samsung,exynos7885-cmu-top + - samsung,exynos7885-cmu-core + - samsung,exynos7885-cmu-peri + + clocks: + minItems: 1 + maxItems: 10 + + clock-names: + minItems: 1 + maxItems: 10 + + "#clock-cells": + const: 1 + + reg: + maxItems: 1 + +allOf: + - if: + properties: + compatible: + contains: + const: samsung,exynos7885-cmu-top + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + + clock-names: + items: + - const: oscclk + + - if: + properties: + compatible: + contains: + const: samsung,exynos7885-cmu-core + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_CORE bus clock (from CMU_TOP) + - description: CCI clock (from CMU_TOP) + - description: G3D clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_core_bus + - const: dout_core_cci + - const: dout_core_g3d + + - if: + properties: + compatible: + contains: + const: samsung,exynos7885-cmu-peri + + then: + properties: + clocks: + items: + - description: External reference clock (26 MHz) + - description: CMU_PERI bus clock (from CMU_TOP) + - description: SPI0 clock (from CMU_TOP) + - description: SPI1 clock (from CMU_TOP) + - description: UART0 clock (from CMU_TOP) + - description: UART1 clock (from CMU_TOP) + - description: UART2 clock (from CMU_TOP) + - description: USI0 clock (from CMU_TOP) + - description: USI1 clock (from CMU_TOP) + - description: USI2 clock (from CMU_TOP) + + clock-names: + items: + - const: oscclk + - const: dout_peri_bus + - const: dout_peri_spi0 + - const: dout_peri_spi1 + - const: dout_peri_uart0 + - const: dout_peri_uart1 + - const: dout_peri_uart2 + - const: dout_peri_usi0 + - const: dout_peri_usi1 + - const: dout_peri_usi2 + +required: + - compatible + - "#clock-cells" + - clocks + - clock-names + - reg + +additionalProperties: false + +examples: + # Clock controller node for CMU_PERI + - | + #include + + cmu_peri: clock-controller@10010000 { + compatible = "samsung,exynos7885-cmu-peri"; + reg = <0x10010000 0x8000>; + #clock-cells = <1>; + + clocks = <&oscclk>, + <&cmu_top CLK_DOUT_PERI_BUS>, + <&cmu_top CLK_DOUT_PERI_SPI0>, + <&cmu_top CLK_DOUT_PERI_SPI1>, + <&cmu_top CLK_DOUT_PERI_UART0>, + <&cmu_top CLK_DOUT_PERI_UART1>, + <&cmu_top CLK_DOUT_PERI_UART2>, + <&cmu_top CLK_DOUT_PERI_USI0>, + <&cmu_top CLK_DOUT_PERI_USI1>, + <&cmu_top CLK_DOUT_PERI_USI2>; + clock-names = "oscclk", + "dout_peri_bus", + "dout_peri_spi0", + "dout_peri_spi1", + "dout_peri_uart0", + "dout_peri_uart1", + "dout_peri_uart2", + "dout_peri_usi0", + "dout_peri_usi1", + "dout_peri_usi2"; + }; + +... -- 2.34.1