On Mon, Sep 28, 2015 at 04:56:41PM -0500, Adrian Alonso wrote: > 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@xxxxxxxxxxxxx> > --- > Changes for V2: New patch on imx7d iomuxc-lpsr patch series > Changes for V3: Add shared input select register notes > Changes for V4: Resend > Changes for V5: > - Fix spell error > - Remove references of SHARE_INPUT_SELECT_REG flag > Changes for V6: Resend > Changes for v7: Resend > > .../bindings/pinctrl/fsl,imx7d-pinctrl.txt | 63 +++++++++++++++++++++- > 1 file changed, 62 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt > index 8bbf25d..aae069f 100644 > --- a/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt > +++ b/Documentation/devicetree/bindings/pinctrl/fsl,imx7d-pinctrl.txt > @@ -1,16 +1,42 @@ > * 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 retention capabilities on gpios that are part of iomuxc-lpsr > +(GPIO1_IO7..GPIO1_IO0). While iomuxc-lpsr provides its own set of registers for > +mux and pad control settings, it shares the input select register from main > +iomuxc controller for daisy chain settings, the fsl,input-sel property extends > +fsl,imx-pinctrl driver to support iomuxc-lpsr controller. > + > +iomuxc_lpsr: iomuxc-lpsr@302c0000 { > + compatible = "fsl,imx7d-iomuxc-lpsr"; > + reg = <0x302c0000 0x10000>; > + fsl,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" for main IOMUXC controller, or > + "fsl,imx7d-iomuxc-lpsr" for Low Power State Retention IOMUXC controller. > - 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 > imx7d-pinfunc.h under device tree source folder. The last integer CONFIG is > the pad setting value like pull-up on this pin. Please refer to i.MX7 Dual > Reference Manual for detailed CONFIG settings. > +- fsl,input-sel: required property for iomuxc-lpsr controller, this property is > + a phandle for main iomuxc controller which shares the input select register for > + daisy chain settings. > > CONFIG bits definition: > PAD_CTL_PUS_100K_DOWN (0 << 5) > @@ -25,3 +51,38 @@ 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>; > + fsl,input-sel = <&iomuxc>; > + > + 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 I'm not sure how many times I should repeat: you should set up a I2C1_SDA instead of two I2C1_SCL in this example. Shawn > + >; > + }; > +}; > -- > 2.1.4 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html