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c1e802f68c
This patch adds the gpio-ranges and gpio-reserved-ranges property definitions to the binding text files supported by the pinctrl-msm driver framework. gpio-ranges: For DT-based platforms the pinctrl-msm framework currently relies on the deprecated-for-DT gpiochip_add_pin_range() function to add the range of GPIOs to be handled by the pin controller. Due to interactions within gpiolib code, this causes the pinctrl-msm driver to bail out (-517) during boot when a gpio-hog is declared. This can be fatal and cause the system to not boot or reset (for a detailed explanation and call-trace, refer to patch: "pinctrl: msm: fix gpio-hog related boot issues" in this series). gpio-reserved-ranges: The binding has been added as a precaution since the TrustZone firmware (aka QSEE), which is running as the hypervisor, might have reserved certain, but undisclosed pins. Hence reading or writing to the registers for those pins will cause an XPU violation and this subsequently crashes the kernel. Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
96 lines
3.1 KiB
Plaintext
96 lines
3.1 KiB
Plaintext
Qualcomm APQ8064 TLMM block
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Required properties:
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- compatible: "qcom,apq8064-pinctrl"
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- reg: Should be the base address and length of the TLMM block.
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- interrupts: Should be the parent IRQ of the TLMM block.
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- interrupt-controller: Marks the device node as an interrupt controller.
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- #interrupt-cells: Should be two.
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells : Should be two.
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The first cell is the gpio pin number and the
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second cell is used for optional parameters.
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- gpio-ranges: see ../gpio/gpio.txt
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Optional properties:
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- gpio-reserved-ranges: see ../gpio/gpio.txt
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Please refer to ../gpio/gpio.txt and ../interrupt-controller/interrupts.txt for
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a general description of GPIO and interrupt bindings.
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Please refer to pinctrl-bindings.txt in this directory for details of the
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common pinctrl bindings used by client devices, including the meaning of the
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phrase "pin configuration node".
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Qualcomm's pin configuration nodes act as a container for an arbitrary number of
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subnodes. Each of these subnodes represents some desired configuration for a
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pin, a group, or a list of pins or groups. This configuration can include the
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mux function to select on those pin(s)/group(s), and various pin configuration
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parameters, such as pull-up, drive strength, etc.
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The name of each subnode is not important; all subnodes should be enumerated
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and processed purely based on their content.
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Each subnode only affects those parameters that are explicitly listed. In
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other words, a subnode that lists a mux function but no pin configuration
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parameters implies no information about any pin configuration parameters.
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Similarly, a pin subnode that describes a pullup parameter implies no
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information about e.g. the mux function.
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The following generic properties as defined in pinctrl-bindings.txt are valid
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to specify in a pin configuration subnode:
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pins, function, bias-disable, bias-pull-down, bias-pull,up, drive-strength,
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output-low, output-high.
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Non-empty subnodes must specify the 'pins' property.
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Valid values for pins are:
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gpio0-gpio89
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Valid values for function are:
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cam_mclk, codec_mic_i2s, codec_spkr_i2s, gp_clk_0a, gp_clk_0b, gp_clk_1a,
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gp_clk_1b, gp_clk_2a, gp_clk_2b, gpio, gsbi1, gsbi2, gsbi3, gsbi4,
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gsbi4_cam_i2c, gsbi5, gsbi5_spi_cs1, gsbi5_spi_cs2, gsbi5_spi_cs3, gsbi6,
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gsbi6_spi_cs1, gsbi6_spi_cs2, gsbi6_spi_cs3, gsbi7, gsbi7_spi_cs1,
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gsbi7_spi_cs2, gsbi7_spi_cs3, gsbi_cam_i2c, hdmi, mi2s, riva_bt, riva_fm,
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riva_wlan, sdc2, sdc4, slimbus, spkr_i2s, tsif1, tsif2, usb2_hsic, ps_hold
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Example:
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msmgpio: pinctrl@800000 {
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compatible = "qcom,apq8064-pinctrl";
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reg = <0x800000 0x4000>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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interrupts = <0 16 0x4>;
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pinctrl-names = "default";
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pinctrl-0 = <&gsbi5_uart_default>;
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gpio-ranges = <&msmgpio 0 0 90>;
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gsbi5_uart_default: gsbi5_uart_default {
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mux {
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pins = "gpio51", "gpio52";
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function = "gsbi5";
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};
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tx {
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pins = "gpio51";
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drive-strength = <4>;
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bias-disable;
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};
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rx {
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pins = "gpio52";
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drive-strength = <2>;
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bias-pull-up;
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};
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};
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};
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