lkml.org 
[lkml]   [2014]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4/7] pinctrl: zynq: Document DT binding
Am 03.11.2014 um 20:05 schrieb Soren Brinkmann:
> Add documentation for the devicetree binding for the Zynq pincontroller.
>
> Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
> ---
> .../bindings/pinctrl/xlnx,zynq-pinctrl.txt | 90 ++++++++++++++++++++++
> 1 file changed, 90 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/xlnx,zynq-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/xlnx,zynq-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/xlnx,zynq-pinctrl.txt
> new file mode 100644
> index 000000000000..86a86b644e6c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/xlnx,zynq-pinctrl.txt
> @@ -0,0 +1,90 @@
> + Binding for Xilinx Zynq Pinctrl
> +
> +Required properties:
> +- compatible: "xlnx,zynq-pinctrl"
> +- syscon: phandle to SLCR
> +- reg: Offset and length of pinctrl space in SLCR
> +
> +Please refer to pinctrl-bindings.txt in this directory for details of the
> +common pinctrl bindings used by client devices, including the meaning of the
> +phrase "pin configuration node".
> +
> +Zynq's pin configuration nodes act as a container for an abitrary number of

"arbitrary"

> +subnodes. Each of these subnodes represents some desired configuration for a
> +pin, a group, or a list of pins or groups. This configuration can include the
> +mux function to select on those pin(s)/group(s), and various pin configuration
> +parameters, such as pull-up, slew rate, etc.
> +
> +The name of each subnode is not important; all subnodes should be enumerated
> +and processed purely based on their content.
> +
> +Each subnode only affects those parameters that are explicitly listed. In
> +other words, a subnode that lists a mux function but no pin configuration
> +parameters implies no information about any pin configuration parameters.
> +Similarly, a pin subnode that describes a pullup parameter implies no
> +information about e.g. the mux function.
> +
> +
> +The following generic properties as defined in pinctrl-bindings.txt are valid
> +to specify in a pin configuration subnode:
> + groups, pins, function, bias-disable, bias-high-impedance, bias-pull-up,
> + slew-rate, low-power-disable, low-power-enable
> +
> + Valid arguments for 'slew-rate' are '0' and '1' to select between slow and fast
> + respectively.
> +
> + Valid values for groups are:
> + ethernet0_0_grp, ethernet1_0_grp, mdio0_0_grp, mdio1_0_grp,
> + qspi0_0_grp, qspi1_0_grp, qspi_fbclk, qspi_cs1_grp, spi0_0_grp,
> + spi0_1_grp - spi0_2_grp, spi1_0_grp - spi1_3_grp, sdio0_0_grp - sdio0_2_grp,
> + sdio1_0_grp - sdio1_3_grp, sdio0_emio_wp, sdio0_emio_cd, sdio1_emio_wp,
> + sdio1_emio_cd, smc0_nor, smc0_nor_cs1_grp, smc0_nor_addr25_grp, smc0_nand,
> + can0_0_grp - can0_10_grp, can1_0_grp - can1_11_grp, uart0_0_grp - uart0_10_grp,
> + uart1_0_grp - uart1_11_grp, i2c0_0_grp - i2c0_10_grp, i2c1_0_grp - i2c1_10_grp,
> + ttc0_0_grp - ttc0_2_grp, ttc1_0_grp - ttc1_2_grp, swdt0_0_grp - swdt0_4_grp,
> + gpio0_0_grp - gpio0_53_grp
> +
> + Valid values for pins are:
> + MIO0 - MIO53

What about the four EMIO_SD* pins?

> +
> + Valid values for function are:
> + ethernet0, ethernet1, mdio0, mdio1, qspi0, qspi1, qspi_fbclk, qspi_cs1,
> + spi0, spi1, sdio0, sdio0_pc, sdio0_cd, sdio0_wp,
> + sdio1, sdio1_pc, sdio1_cd, sdio1_wp,
> + smc0_nor, smc0_nor_cs1, smc0_nor_addr25, smc0_nand, can0, can1, uart0, uart1,
> + i2c0, i2c1, ttc0, ttc1, swdt0, gpio0
> +
> +The following driver-specific properties as defined here are valid to specify in
> +a pin configuration subnode:
> + - io-standard: Configure the pin to use the selected IO standard according to
> + this mapping:
> + 1: LVCMOS18
> + 2: LVCMOS25
> + 3: LVCMOS33
> + 4: HSTL
> +
> +Example:
> + pinctrl0: pinctrl@700 {
> + compatible = "xlnx,pinctrl-zynq";
> + reg = <0x700 0x200>;
> + syscon = <&slcr>;
> +
> + pinctrl_uart1_default: pinctrl-uart1-default {

Nit: Is it really necessary to prefix subnodes of "pinctrl@700" with
"pinctrl-", here and in .dts?

> + common {
> + groups = "uart1_10_grp";
> + function = "uart1";
> + slew-rate = <0>;
> + io-standard = <1>;
> + };
> +
> + rx {
> + pins = "MIO49";
> + bias-high-impedance;
> + };
> +
> + tx {
> + pins = "MIO48";
> + bias-disable;
> + };
> + };
> + };

Otherwise looks good.

Cheers,
Andreas

--
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 21284 AG Nürnberg
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-11-05 05:01    [W:0.201 / U:8.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site