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Date: Sat, 17 Feb 2018 22:03:53 +0100
From: Andreas Färber <afaerber@...e.de>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
linus.walleij@...aro.org, robh+dt@...nel.org
Cc: liuwei@...ions-semi.com, mp-cs@...ions-semi.com,
96boards@...obotics.com, devicetree@...r.kernel.org,
daniel.thompson@...aro.org, amit.kucheria@...aro.org,
linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] dt-bindings: pinctrl: Add bindings for Actions S900
SoC
Am 17.02.2018 um 21:44 schrieb Manivannan Sadhasivam:
> Add pinctrl bindings for Actions Semi S900 SoC
>
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
> .../bindings/pinctrl/actions,s900-pinctrl.txt | 171 +++++++++++++++++++++
> 1 file changed, 171 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/actions,s900-pinctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/actions,s900-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/actions,s900-pinctrl.txt
> new file mode 100644
> index 000000000000..ee7d3ecd9bd9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/actions,s900-pinctrl.txt
> @@ -0,0 +1,171 @@
> +Actions Semi S900 Pin Controller
So you are targeting to have one bindings file per SoC?
> +
> +This binding describes the pin controller found in the S900 SoC.
> +
> +Required Properties:
> +
> +- compatible: Should be "actions,s900-pinctrl"
> +- reg: Should contain the register base address and size of
> + the pin controller.
> +- clocks: phandle of the clock feeding the pin controller
> +
> +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".
> +
> +The pin configuration nodes act as a container for an arbitrary number of
> +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 group(s), and various pin configuration
> +parameters, such as pull-up, drive strength, etc.
> +
> +PIN CONFIGURATION NODES:
> +
> +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.
> +
> +Pinmux functions are available only for the pin groups while pinconf
> +parameters are available for both pin groups and individual pins.
> +
> +The following generic properties as defined in pinctrl-bindings.txt are valid
> +to specify in a pin configuration subnode:
> +
> +Required Properties:
> +
> +- pins: An array of strings, each string containing the name of a pin.
> + These pins are used for selecting the pull control and schmitt
> + trigger parameters. The following are the list of pins
> + available:
> +
> + ETH_TXD0, ETH_TXD1, ETH_TXEN, ETH_RXER, ETH_CRS_DV,
> + ETH_RXD1, ETH_RXD0, ETH_REF_CLK, ETH_MDC, ETH_MDIO,
> + SIRQ0, SIRQ1, SIRQ2, I2S_D0, I2S_BCLK0, I2S_LRCLK0,
> + I2S_MCLK0, I2S_D1, I2S_BCLK1, I2S_LRCLK1, I2S_MCLK1,
> + PCM1_IN, PCM1_CLK, PCM1_SYNC, PCM1_OUT, ERAM_A5,
> + ERAM_A6, ERAM_A7, ERAM_A8, ERAM_A9, ERAM_A10, ERAM_A11,
> + LVDS_OEP, LVDS_OEN, LVDS_ODP, LVDS_ODN, LVDS_OCP,
> + LVDS_OCN, LVDS_OBP, LVDS_OBN, LVDS_OAP, LVDS_OAN,
> + LVDS_EEP, LVDS_EEN, LVDS_EDP, LVDS_EDN, LVDS_ECP,
> + LVDS_ECN, LVDS_EBP, LVDS_EBN, LVDS_EAP, LVDS_EAN,
> + SD0_D0, SD0_D1, SD0_D2, SD0_D3, SD1_D0, SD1_D1,
> + SD1_D2, SD1_D3, SD0_CMD, SD0_CLK, SD1_CMD, SD1_CLK,
> + SPI0_SCLK, SPI0_SS, SPI0_MISO, SPI0_MOSI, UART0_RX,
> + UART0_TX, UART2_RX, UART2_TX, UART2_RTSB, UART2_CTSB,
> + UART3_RX, UART3_TX, UART3_RTSB, UART3_CTSB, UART4_RX,
> + UART4_TX, I2C0_SCLK, I2C0_SDATA, I2C1_SCLK, I2C1_SDATA,
> + I2C2_SCLK, I2C2_SDATA, CSI0_DN0, CSI0_DP0, CSI0_DN1,
> + CSI0_DP1, CSI0_CN, CSI0_CP, CSI0_DN2, CSI0_DP2, CSI0_DN3,
> + CSI0_DP3, DSI_DP3, DSI_DN3, DSI_DP1, DSI_DN1, DSI_CP,
> + DSI_CN, DSI_DP0, DSI_DN0, DSI_DP2, DSI_DN2, SENSOR0_PCLK,
> + CSI1_DN0,CSI1_DP0,CSI1_DN1, CSI1_DP1, CSI1_CN, CSI1_CP,
> + SENSOR0_CKOUT, NAND0_D0, NAND0_D1, NAND0_D2, NAND0_D3,
> + NAND0_D4, NAND0_D5, NAND0_D6, NAND0_D7, NAND0_DQS,
> + NAND0_DQSN, NAND0_ALE, NAND0_CLE, NAND0_CEB0, NAND0_CEB1,
> + NAND0_CEB2, NAND0_CEB3, NAND1_D0, NAND1_D1, NAND1_D2,
> + NAND1_D3, NAND1_D4, NAND1_D5, NAND1_D6, NAND1_D7, NAND1_DQS,
> + NAND1_DQSN, NAND1_ALE, NAND1_CLE, NAND1_CEB0, NAND1_CEB1,
> + NAND1_CEB2, NAND1_CEB3, SGPIO0, SGPIO1, SGPIO2, SGPIO3
Should be lower-case?
> +
> +- groups: An array of strings, each string containing the name of a pin
> + group. These pin groups are used for selecting the pinmux
> + functions. The following are the list of pin groups available:
> +
> + mfp0_22, mfp0_21_20_eth_mdc, mfp0_21_20_eth_mdio,
> + mfp0_19_sirq0, mfp0_19_sirq1, mfp0_18_16_eth_txd0,
> + mfp0_18_16_eth_txd1, mfp0_15_13_eth_txen, mfp0_15_13_eth_rxer,
> + mfp0_12_11, mfp0_10_8_eth_rxd1, mfp0_10_8_eth_rxd0, mfp0_7_6,
> + mfp0_5_i2s_d0, mfp0_5_i2s_d1, mfp0_4_3, mfp0_2_i2s0,
> + mfp0_2_i2s1, mfp0_1_0_pcm1_in_out, mfp0_1_0_pcm1_clk,
> + mfp0_1_0_pcm1_sync, mfp1_31_29_eram_a5, mfp1_31_29_eram_a6,
> + mfp1_31_29_eram_a7, mfp1_28_26_eram_a8, mfp1_28_26_eram_a9,
> + mfp1_28_26_eram_a10, mfp1_25_23, mfp1_22_lvds_oep_odn,
> + mfp1_22_lvds_ocp_obn, mfp1_22_lvds_oap_oan, mfp1_21_lvds_e,
> + mfp1_5_4, mfp1_3_1_spi0_ss, mfp1_3_1_spi0_miso, mfp2_23,
> + mfp2_22, mfp2_21, mfp2_20, mfp2_19_17, mfp2_16_14, mfp2_13_11,
> + mfp2_10_9, mfp2_8_7, mfp2_6_5, mfp2_4_3, mfp2_2_0, mfp3_27,
> + mfp3_21_19, mfp3_18_16, mfp3_15, mfp3_14, mfp3_13,
> + mfp3_12_dsi_dp3_dn1, mfp3_12_dsi_cp_dn0, mfp3_12_dsi_dp2_dn2,
> + mfp3_11, mfp3_10_nand1_ceb3, mfp3_10_nand1_ceb0, mfp3_9,
> + mfp3_8
> +
> + These pin groups are used for selecting the drive strength
> + parameters.
> +
> + drv0_31_30, drv0_29_28, drv0_27_26, drv0_25_24, drv0_23_22,
> + drv0_21_20, drv0_19_18, drv0_17_16, drv0_15_14, drv0_13_12,
> + drv0_11_10, drv0_9_8, drv0_7_6, drv0_5_4, drv0_3_2, drv0_1_0,
> + drv1_29_28, drv1_27_26, drv1_25_24, drv1_23_22, drv1_21_20,
> + drv1_19_18, drv1_17_16, drv1_15_14, drv1_13_12, drv1_11_10,
> + drv1_9_8, drv1_7_6, drv1_5_4, drv2_31_30, drv2_29_28,
> + drv2_27_26, drv2_21_20
> +
> + These pin groups are used for selecting the slew rate
> + parameters.
> +
> + sr0_15, sr0_14, sr0_13, sr0_12, sr0_11, sr0_10, sr0_9, sr0_8,
> + sr0_7, sr0_6, sr0_5, sr0_4, sr0_3, sr0_2, sr0_1, sr0_0,
> + sr1_25, sr1_24, sr1_23, sr1_22, sr1_21, sr1_20, sr1_19,
> + sr1_18, sr2_31, sr2_30, sr2_29, sr2_25
> +
> +- function: An array of strings, each string containing the name of the
> + pinmux functions. These functions can only be selected by
> + the corresponding pin groups. The following are the list of
> + pinmux functions available:
> +
> + eram, eth_rmii, eth_smii, spi0, spi1, spi2, spi3, sens0,
> + uart0, uart1, uart2, uart3, uart4, uart5, uart6, i2s0, i2s1,
> + pcm0, pcm1, jtag, pwm0, pwm1, pwm2, pwm3, pwm4, pwm5, sd0,
> + sd1, sd2, sd3, i2c0, i2c1, i2c2, i2c3, i2c4, i2c5, lvds,
> + usb30, usb20, gpu, mipi_csi0, mipi_csi1, mipi_dsi, nand0,
> + nand1, spdif, sirq0, sirq1, sirq2
> +
> +Optional Properties:
> +
> +- bias-bus-hold: No arguments. The specified pins should retain the previous
> + state value.
> +- bias-high-impedance: No arguments. The specified pins should be configured
> + as high impedance.
> +- bias-pull-down: No arguments. The specified pins should be configued as
configured
> + pull down.
> +- bias-pull-up: No arguments. The specified pins should be configued as
ditto
> + pull up.
> +- input-schmitt-enable: No arguments: Enable schmitt trigger for the specified
> + pins
> +- input-schmitt-disable: No arguments: Disable schmitt trigger for the specified
> + pins
> +- slew-rate: Integer. Sets slew rate for the specified pins.
> + Valid values are:
> + <0> - Slow
> + <1> - Fast
> +- drive-strength: Integer. Selects the drive strength for the specified
> + pins.
> + Valid values are:
> + <2> - mA
> + <4> - mA
> + <8> - mA
> + <12> - mA
This looks weird and should get a better explanation: <2> - 2 mA?
Or "... drive strength in mA for ..." and drop "- mA"?
> +
> +Example:
> +
> + pinctrl: pinctrl@...b0000 {
> + compatible = "actions,s900-pinctrl";
> + reg = <0x0 0xe01b0000 0x0 0x1000>;
> + clocks = <&cmu CLK_GPIO>;
> +
> + uart2-default: uart2-default {
> + pinmux {
> + groups = "mfp1_22_lvds_oep_odn";
> + function = "uart2";
> + };
> + pinconf {
> + groups = "drv1_27_26";
> + drive-strength = <12>;
> + };
> + };
> + };
Regards,
Andreas
--
SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
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