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Thu, 10 Sep 2015 12:24:05 -0700 From: Adrian Alonso To: , , , , CC: , , , , , , , Subject: [PATCH v3 8/8] pinctrl: freescale: imx: imx7d iomuxc-lpsr devicetree bindings Date: Thu, 10 Sep 2015 14:21:48 -0500 Message-ID: <1441912908-21946-8-git-send-email-aalonso@freescale.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1441912908-21946-1-git-send-email-aalonso@freescale.com> References: <1441912908-21946-1-git-send-email-aalonso@freescale.com> X-EOPAttributedMessage: 0 X-Microsoft-Exchange-Diagnostics: 1; BN1AFFO11FD056; 1:wit9omyw1N981kXJOvEkYIN9NLH7wVLdA7kgj2cyEBvzoHicfq6kaAwxRZcrk/lTmY6P6+oWLT6VJ1+45WFJC95hCi1DAp7WNDr3RzNI8+HQ04j05Iklqo/cQDK15N+uZbUjoLlk9UErPJhEZQ38qIMbYQnAuc06y1pvRFcK59jvTz5T+zPgGm/Hx2KWN4Yf9l7rPFI8rl8Q1qL4whSPgVuOjabNNlPoohmdihQlIxb90k3ev+4po9spE6VHAUNxm8cRb31xWJIv+gSOU+KhJdGRT9BejaPpSubEb1bJMhrrln8/SvX2dsPVx4jTETLnYaJT1clDeAsryN/pV9yBR14WCi9dZoeaIdmNLnPspxLnwqqrkjEzwb3laTGN9Q6sNpIrSoWOh59w3kDT5oLiAQ== X-Forefront-Antispam-Report: CIP:192.88.168.50; CTRY:US; IPV:NLI; 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While iomuxc-lpsr provides its own set of registers for +mux and pad control settings it shares the input select register from iomuxc +for daisy chain settings, the input-sel phandle and SHARE_INPUT_SELECT_REG flag +extends fsl,imx-pinctrl driver to support iomuxc-lpsr controller. + +iomuxc_lpsr: iomuxc-lpsr@302c0000 { + compatible = "fsl,imx7d-iomuxc-lpsr"; + reg = <0x302c0000 0x10000>; + input-sel = <&iomuxc>; +}; + +iomuxc: iomuxc@30330000 { + compatible = "fsl,imx7d-iomuxc"; + reg = <0x30330000 0x10000>; +}; + +Pheriparials using pads from iomuxc-lpsr support low state retention power +state, under LPSR mode GPIO's state of pads are retain. + Please refer to fsl,imx-pinctrl.txt in this directory for common binding part and usage. Required properties: - compatible: "fsl,imx7d-iomuxc" +- compatible: "fsl,imx7d-iomuxc-lpsr" - fsl,pins: each entry consists of 6 integers and represents the mux and config setting for one pin. The first 5 integers are specified using a PIN_FUNC_ID macro, which can be found in @@ -25,3 +48,37 @@ PAD_CTL_DSE_X1 (0 << 0) PAD_CTL_DSE_X2 (1 << 0) PAD_CTL_DSE_X3 (2 << 0) PAD_CTL_DSE_X4 (3 << 0) + +Examples: +While iomuxc-lpsr is intended to be used by dedicated peripherals to take +advantages of LPSR power mode, is also possible that an IP to use pads from +any of the iomux controllers. For example the I2C1 IP can use SCL pad from +iomuxc-lpsr controller and SDA pad from iomuxc controller as: + +i2c1: i2c@30a20000 { + pinctrl-names = "default"; + pinctrl-0 = <&pinctrl_i2c1_1 &pinctrl_i2c1_2>; + status = "okay"; +}; + +iomuxc-lpsr@302c0000 { + compatible = "fsl,imx7d-iomuxc-lpsr"; + reg = <0x302c0000 0x10000>; + + pinctrl_i2c1_1: i2c1grp-1 { + fsl,pins = < + MX7D_PAD_GPIO1_IO04__I2C1_SCL 0x4000007f + >; + }; +}; + +iomuxc@30330000 { + compatible = "fsl,imx7d-iomuxc"; + reg = <0x30330000 0x10000>; + + pinctrl_i2c1_2: i2c1grp-2 { + fsl,pins = < + MX7D_PAD_I2C1_SCL__I2C1_SCL 0x4000007f + >; + }; +};