From patchwork Tue Aug 18 07:27:53 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: YH Huang X-Patchwork-Id: 508201 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id C98D31406A9 for ; Tue, 18 Aug 2015 17:29:42 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751884AbbHRH31 (ORCPT ); Tue, 18 Aug 2015 03:29:27 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:49583 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751157AbbHRH2o (ORCPT ); Tue, 18 Aug 2015 03:28:44 -0400 X-Listener-Flag: 11101 Received: from mtkhts07.mediatek.inc [(172.21.101.69)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 496340974; Tue, 18 Aug 2015 15:28:39 +0800 Received: from mtkslt302.mediatek.inc (10.21.14.115) by mtkhts07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Tue, 18 Aug 2015 15:28:38 +0800 From: YH Huang To: Matthias Brugger , Mark Rutland , Thierry Reding CC: Rob Herring , Pawel Moll , , , , , , , Sascha Hauer , , YH Huang Subject: [PATCH v7 1/3] dt-bindings: pwm: add MediaTek display PWM bindings Date: Tue, 18 Aug 2015 15:27:53 +0800 Message-ID: <1439882875-19596-2-git-send-email-yh.huang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1439882875-19596-1-git-send-email-yh.huang@mediatek.com> References: <1439882875-19596-1-git-send-email-yh.huang@mediatek.com> MIME-Version: 1.0 X-MTK: N Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Document the device-tree binding of MediaTek display PWM. The PWM has one channel to control the backlight brightness for display. It supports MT8173 and MT6595. Signed-off-by: YH Huang --- .../devicetree/bindings/pwm/pwm-mtk-disp.txt | 42 ++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt diff --git a/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt new file mode 100644 index 0000000..f8f59ba --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/pwm-mtk-disp.txt @@ -0,0 +1,42 @@ +MediaTek display PWM controller + +Required properties: + - compatible: should be "mediatek,-disp-pwm": + - "mediatek,mt8173-disp-pwm": found on mt8173 SoC. + - "mediatek,mt6595-disp-pwm": found on mt6595 SoC. + - reg: physical base address and length of the controller's registers. + - #pwm-cells: must be 2. See pwm.txt in this directory for a description of + the cell format. + - clocks: phandle and clock specifier of the PWM reference clock. + - clock-names: must contain the following: + - "main": clock used to generate PWM signals. + - "mm": sync signals from the modules of mmsys. + - pinctrl-names: Must contain a "default" entry. + - pinctrl-0: One property must exist for each entry in pinctrl-names. + See pinctrl/pinctrl-bindings.txt for details of the property values. + +Example: + pwm0: pwm@1401e000 { + compatible = "mediatek,mt8173-disp-pwm", + "mediatek,mt6595-disp-pwm"; + reg = <0 0x1401e000 0 0x1000>; + #pwm-cells = <2>; + clocks = <&mmsys CLK_MM_DISP_PWM026M>, + <&mmsys CLK_MM_DISP_PWM0MM>; + clock-names = "main", "mm"; + pinctrl-names = "default"; + pinctrl-0 = <&disp_pwm0_pins>; + }; + + backlight_lcd: backlight_lcd { + compatible = "pwm-backlight"; + pwms = <&pwm0 0 1000000>; + brightness-levels = < + 0 16 32 48 64 80 96 112 + 128 144 160 176 192 208 224 240 + 255 + >; + default-brightness-level = <9>; + power-supply = <&mt6397_vio18_reg>; + enable-gpios = <&pio 95 GPIO_ACTIVE_HIGH>; + };