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Fri, 11 Jan 2019 00:23:03 -0800 (PST) From: Yash Shah To: palmer@sifive.com, linux-pwm@vger.kernel.org, linux-riscv@lists.infradead.org Subject: [PATCH 1/2] pwm: sifive: Add DT documentation for SiFive PWM Controller Date: Fri, 11 Jan 2019 13:52:43 +0530 Message-Id: <1547194964-16718-2-git-send-email-yash.shah@sifive.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1547194964-16718-1-git-send-email-yash.shah@sifive.com> References: <1547194964-16718-1-git-send-email-yash.shah@sifive.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190111_002305_146359_D9C89686 X-CRM114-Status: GOOD ( 13.30 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, robh+dt@kernel.org, sachin.ghadi@sifive.com, Yash Shah , thierry.reding@gmail.com, paul.walmsley@sifive.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org DT documentation for PWM controller added with updated compatible string. Signed-off-by: Wesley W. Terpstra [Atish: Compatible string update] Signed-off-by: Atish Patra Signed-off-by: Yash Shah --- .../devicetree/bindings/pwm/pwm-sifive.txt | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sifive.txt diff --git a/Documentation/devicetree/bindings/pwm/pwm-sifive.txt b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt new file mode 100644 index 0000000..e0fc22a --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt @@ -0,0 +1,37 @@ +SiFive PWM controller + +Unlike most other PWM controllers, the SiFive PWM controller currently only +supports one period for all channels in the PWM. This is set globally in DTS. +The period also has significant restrictions on the values it can achieve, +which the driver rounds to the nearest achievable frequency. + +Required properties: +- compatible: Please refer to sifive-blocks-ip-versioning.txt +- reg: physical base address and length of the controller's registers +- clocks: Should contain a clock identifier for the PWM's parent clock. +- #pwm-cells: Should be 2. + The first cell is the PWM channel number + The second cell is the PWM polarity +- sifive,approx-period-ns: the driver will get as close to this period as it can +- interrupts: one interrupt per PWM channel + +PWM RTL that corresponds to the IP block version numbers can be found +here: + +https://github.com/sifive/sifive-blocks/tree/master/src/main/scala/devices/pwm + +Further information on the format of the IP +block-specific version numbers can be found in +Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt + +Examples: + +pwm: pwm@10020000 { + compatible = "sifive,fu540-c000-pwm","sifive,pwm0"; + reg = <0x0 0x10020000 0x0 0x1000>; + clocks = <&tlclk>; + interrupt-parent = <&plic>; + interrupts = <42 43 44 45>; + #pwm-cells = <2>; + sifive,approx-period-ns = <1000000>; +}; -- 1.9.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv