From: aalonso@freescale.com (Adrian Alonso)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 8/8] pinctrl: freescale: imx: imx7d iomuxc-lpsr devicetree bindings
Date: Tue, 1 Sep 2015 17:49:13 -0500 [thread overview]
Message-ID: <1441147753-13239-8-git-send-email-aalonso@freescale.com> (raw)
In-Reply-To: <1441147753-13239-1-git-send-email-aalonso@freescale.com>
Add iomuxc-lpsr devicetree bindings documentation
Provide documentation context as well an example on
pheriperals that could use pad from either iomuxc controller
supported by iMX7D SoC
Signed-off-by: Adrian Alonso <aalonso@freescale.com>
---
Changes for V2: New patch on imx7d iomuxc-lpsr patch series
.../bindings/pinctrl/fsl,imx7d-pinctrl.txt | 43 ++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
index 8bbf25d..c7310fc 100644
--- a/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt
@@ -1,10 +1,19 @@
* Freescale i.MX7 Dual IOMUX Controller
+iMX7D supports two iomuxc controllers, fsl,imx7d-iomuxc controller is similar
+as previous iMX SoC generation and fsl,imx7d-iomuxc-lpsr which provides low
+power state rentetion capabilities on gpios that are part of iomuxc-lpsr
+(GPIO1_IO7..GPIO1_IO0).
+
+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 <mux_reg conf_reg input_reg mux_val
input_val> are specified using a PIN_FUNC_ID macro, which can be found in
@@ -25,3 +34,37 @@ 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 at 302c0000 {
+ compatible = "fsl,imx7d-iomuxc-lpsr";
+ reg = <0x302c0000 0x10000>;
+
+ pinctrl_i2c1_1: i2c1grp-1 {
+ fsl,pins = <
+ MX7D_PAD_GPIO1_IO04__I2C1_SCL 0x4000007f
+ >;
+ };
+};
+
+iomuxc at 30330000 {
+ compatible = "fsl,imx7d-iomuxc";
+ reg = <0x30330000 0x10000>;
+
+ pinctrl_i2c1_2: i2c1grp-2 {
+ fsl,pins = <
+ MX7D_PAD_I2C1_SCL__I2C1_SCL 0x4000007f
+ >;
+ };
+};
--
2.1.4
next prev parent reply other threads:[~2015-09-01 22:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-01 22:49 [PATCH v2 1/8] pinctrl: freescale: imx: fix system crash if enable two pinctl instances Adrian Alonso
2015-09-01 22:49 ` [PATCH v2 2/8] ARM: imx: imx7d-pinfunc: add gpio1 pad iomux settings Adrian Alonso
2015-09-07 1:01 ` Shawn Guo
2015-09-07 2:18 ` Duan Andy
2015-09-01 22:49 ` [PATCH v2 3/8] ARM: dts: imx: imx7d add iomuxc lpsr device node Adrian Alonso
2015-09-01 22:49 ` [PATCH v2 4/8] ARM: dts: imx: imx7d-sbd add iomuxc-lpsr hoggrp-2 pads Adrian Alonso
2015-09-01 22:49 ` [PATCH v2 5/8] pinctrl: freescale: imx: add ZERO_OFFSET_VALID flag Adrian Alonso
2015-09-07 1:28 ` Shawn Guo
2015-09-08 16:05 ` Alonso Adrian
2015-09-18 13:52 ` Shawn Guo
2015-09-18 16:27 ` Alonso Adrian
2015-09-01 22:49 ` [PATCH v2 6/8] pinctrl: freescale: imx: add shared input select reg support Adrian Alonso
2015-09-07 2:12 ` Shawn Guo
2015-09-08 16:13 ` Alonso Adrian
2015-09-01 22:49 ` [PATCH v2 7/8] pinctrl: freescale: imx7d: support iomux lpsr controller Adrian Alonso
2015-09-01 22:49 ` Adrian Alonso [this message]
2015-09-07 2:42 ` [PATCH v2 8/8] pinctrl: freescale: imx: imx7d iomuxc-lpsr devicetree bindings Shawn Guo
2015-09-08 16:15 ` Alonso Adrian
2015-09-07 0:56 ` [PATCH v2 1/8] pinctrl: freescale: imx: fix system crash if enable two pinctl instances Shawn Guo
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