From: atish.patra@wdc.com (Atish Patra) To: linux-riscv@lists.infradead.org Subject: [RFC 1/4] pwm: sifive: Add DT documentation for SiFive PWM Controller. Date: Tue, 9 Oct 2018 11:51:22 -0700 [thread overview] Message-ID: <1539111085-25502-2-git-send-email-atish.patra@wdc.com> (raw) In-Reply-To: <1539111085-25502-1-git-send-email-atish.patra@wdc.com> From: "Wesley W. Terpstra" <wesley@sifive.com> DT documentation for PWM controller added with updated compatible string. Signed-off-by: Wesley W. Terpstra <wesley@sifive.com> [Atish: Compatible string update] Signed-off-by: Atish Patra <atish.patra@wdc.com> --- .../devicetree/bindings/pwm/pwm-sifive.txt | 32 ++++++++++++++++++++++ 1 file changed, 32 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 00000000..532b10fc --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt @@ -0,0 +1,32 @@ +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: should be one of + "sifive,fu540-c000-pwm0","sifive,pwm0". + PWM controller is HiFive Unleashed specific chip which warrants a + specific compatible string. The second string is kept for backward + compatibility until a firmware update with latest compatible string. +- reg: physical base address and length of the controller's registers +- clocks: The frequency the controller runs at +- #pwm-cells: Should be 2. + The first cell is the PWM channel number + The second cell is the PWM polarity +- sifive,approx-period: the driver will get as close to this period as it can +- interrupts: one interrupt per PWM channel (currently unused in the driver) + +Examples: + +pwm: pwm at 10020000 { + compatible = "sifive,fu540-c000-pwm0","sifive,pwm0"; + reg = <0x0 0x10020000 0x0 0x1000>; + clocks = <&tlclk>; + interrupt-parent = <&plic>; + interrupts = <42 43 44 45>; + #pwm-cells = <2>; + sifive,approx-period = <1000000>; +}; -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Atish Patra <atish.patra@wdc.com> To: palmer@sifive.com, linux-riscv@lists.infradead.org, linux-pwm@vger.kernel.org, linux-gpio@vger.kernel.org Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linus.walleij@linaro.org, linux-kernel@vger.kernel.org, hch@infradead.org, atish.patra@wdc.com, robh+dt@kernel.org, thierry.reding@gmail.com Subject: [RFC 1/4] pwm: sifive: Add DT documentation for SiFive PWM Controller. Date: Tue, 9 Oct 2018 11:51:22 -0700 [thread overview] Message-ID: <1539111085-25502-2-git-send-email-atish.patra@wdc.com> (raw) Message-ID: <20181009185122.WB5aLUtOJ36cNtc92YBQj68CkAM4N9WnT7_ng4eJ_5E@z> (raw) In-Reply-To: <1539111085-25502-1-git-send-email-atish.patra@wdc.com> From: "Wesley W. Terpstra" <wesley@sifive.com> DT documentation for PWM controller added with updated compatible string. Signed-off-by: Wesley W. Terpstra <wesley@sifive.com> [Atish: Compatible string update] Signed-off-by: Atish Patra <atish.patra@wdc.com> --- .../devicetree/bindings/pwm/pwm-sifive.txt | 32 ++++++++++++++++++++++ 1 file changed, 32 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 00000000..532b10fc --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-sifive.txt @@ -0,0 +1,32 @@ +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: should be one of + "sifive,fu540-c000-pwm0","sifive,pwm0". + PWM controller is HiFive Unleashed specific chip which warrants a + specific compatible string. The second string is kept for backward + compatibility until a firmware update with latest compatible string. +- reg: physical base address and length of the controller's registers +- clocks: The frequency the controller runs at +- #pwm-cells: Should be 2. + The first cell is the PWM channel number + The second cell is the PWM polarity +- sifive,approx-period: the driver will get as close to this period as it can +- interrupts: one interrupt per PWM channel (currently unused in the driver) + +Examples: + +pwm: pwm@10020000 { + compatible = "sifive,fu540-c000-pwm0","sifive,pwm0"; + reg = <0x0 0x10020000 0x0 0x1000>; + clocks = <&tlclk>; + interrupt-parent = <&plic>; + interrupts = <42 43 44 45>; + #pwm-cells = <2>; + sifive,approx-period = <1000000>; +}; -- 2.7.4 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2018-10-09 18:51 UTC|newest] Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-10-09 18:51 [RFC 0/4] GPIO & PWM support for HiFive Unleashed Atish Patra 2018-10-09 18:51 ` Atish Patra 2018-10-09 18:51 ` Atish Patra [this message] 2018-10-09 18:51 ` [RFC 1/4] pwm: sifive: Add DT documentation for SiFive PWM Controller Atish Patra 2018-10-10 13:49 ` Thierry Reding 2018-10-10 13:49 ` Thierry Reding 2018-10-15 22:57 ` Atish Patra 2018-10-15 22:57 ` Atish Patra 2018-10-15 23:19 ` Wesley Terpstra 2018-10-15 23:19 ` Wesley Terpstra 2018-10-16 11:13 ` Thierry Reding 2018-10-16 11:13 ` Thierry Reding 2018-10-16 11:01 ` Thierry Reding 2018-10-16 11:01 ` Thierry Reding 2018-10-16 17:31 ` Paul Walmsley 2018-10-16 17:31 ` Paul Walmsley 2018-10-16 22:04 ` Thierry Reding 2018-10-16 22:04 ` Thierry Reding 2018-10-16 22:20 ` Atish Patra 2018-10-16 22:20 ` Atish Patra 2018-10-17 15:58 ` Rob Herring 2018-10-17 15:58 ` Rob Herring 2018-10-17 21:45 ` Atish Patra 2018-10-17 21:45 ` Atish Patra 2018-11-10 5:38 ` Paul Walmsley 2018-11-10 5:38 ` Paul Walmsley 2018-10-10 13:51 ` Thierry Reding 2018-10-10 13:51 ` Thierry Reding 2018-10-15 22:45 ` Atish Patra 2018-10-15 22:45 ` Atish Patra 2018-10-16 10:51 ` Thierry Reding 2018-10-16 10:51 ` Thierry Reding 2018-10-16 22:42 ` Atish Patra 2018-10-16 22:42 ` Atish Patra 2018-10-09 18:51 ` [RFC 2/4] pwm: sifive: Add a driver for SiFive SoC PWM Atish Patra 2018-10-09 18:51 ` Atish Patra 2018-10-10 13:11 ` Christoph Hellwig 2018-10-10 13:11 ` Christoph Hellwig 2018-10-10 13:44 ` Thierry Reding 2018-10-10 13:44 ` Thierry Reding 2018-10-16 6:28 ` Atish Patra 2018-10-16 6:28 ` Atish Patra 2018-10-10 14:13 ` Thierry Reding 2018-10-10 14:13 ` Thierry Reding 2018-10-16 6:24 ` Atish Patra 2018-10-16 6:24 ` Atish Patra 2018-10-09 18:51 ` [RFC 3/4] gpio: sifive: Add DT documentation for SiFive GPIO Atish Patra 2018-10-09 18:51 ` Atish Patra 2018-10-09 18:51 ` [RFC 4/4] gpio: sifive: Add GPIO driver for SiFive SoCs Atish Patra 2018-10-09 18:51 ` Atish Patra 2018-10-10 12:35 ` Linus Walleij 2018-10-10 12:35 ` Linus Walleij 2018-10-17 1:01 ` Atish Patra 2018-10-17 1:01 ` Atish Patra 2019-09-18 7:32 ` Bin Meng 2018-10-10 13:01 ` Andreas Schwab 2018-10-10 13:01 ` Andreas Schwab 2018-10-10 13:12 ` Christoph Hellwig 2018-10-10 13:12 ` Christoph Hellwig 2018-10-10 13:28 ` Andreas Schwab 2018-10-10 13:28 ` Andreas Schwab
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