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Documentation/devicetree/bindings/iio/accel/adi,adxl355.yaml
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| @@ -0,0 +1,88 @@ | ||
| # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause | ||
| %YAML 1.2 | ||
| --- | ||
| $id: http://devicetree.org/schemas/iio/accel/adi,adxl355.yaml# | ||
| $schema: http://devicetree.org/meta-schemas/core.yaml# | ||
|
|
||
| title: Analog Devices ADXL355 3-Axis, Low noise MEMS Accelerometer | ||
|
|
||
| maintainers: | ||
| - Puranjay Mohan <puranjay12@gmail.com> | ||
|
|
||
| description: | | ||
| Analog Devices ADXL355 3-Axis, Low noise MEMS Accelerometer that supports | ||
| both I2C & SPI interfaces | ||
| https://www.analog.com/en/products/adxl355.html | ||
| properties: | ||
| compatible: | ||
| enum: | ||
| - adi,adxl355 | ||
|
|
||
| reg: | ||
| maxItems: 1 | ||
|
|
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| interrupts: | ||
| minItems: 1 | ||
| maxItems: 3 | ||
| description: | | ||
| Type for DRDY should be IRQ_TYPE_EDGE_RISING. | ||
| Three configurable interrupt lines exist. | ||
| interrupt-names: | ||
| description: Specify which interrupt line is in use. | ||
| items: | ||
| enum: | ||
| - INT1 | ||
| - INT2 | ||
| - DRDY | ||
| minItems: 1 | ||
| maxItems: 3 | ||
|
|
||
| vdd-supply: | ||
| description: Regulator that provides power to the sensor | ||
|
|
||
| vddio-supply: | ||
| description: Regulator that provides power to the bus | ||
|
|
||
| spi-max-frequency: true | ||
|
|
||
| required: | ||
| - compatible | ||
| - reg | ||
|
|
||
| additionalProperties: false | ||
|
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||
| examples: | ||
| - | | ||
| #include <dt-bindings/gpio/gpio.h> | ||
| #include <dt-bindings/interrupt-controller/irq.h> | ||
| i2c { | ||
| #address-cells = <1>; | ||
| #size-cells = <0>; | ||
| /* Example for a I2C device node */ | ||
| accelerometer@1d { | ||
| compatible = "adi,adxl355"; | ||
| reg = <0x1d>; | ||
| interrupt-parent = <&gpio>; | ||
| interrupts = <25 IRQ_TYPE_EDGE_RISING>; | ||
| interrupt-names = "DRDY"; | ||
| }; | ||
| }; | ||
| - | | ||
| #include <dt-bindings/gpio/gpio.h> | ||
| #include <dt-bindings/interrupt-controller/irq.h> | ||
| spi { | ||
| #address-cells = <1>; | ||
| #size-cells = <0>; | ||
| accelerometer@0 { | ||
| compatible = "adi,adxl355"; | ||
| reg = <0>; | ||
| spi-max-frequency = <1000000>; | ||
| interrupt-parent = <&gpio>; | ||
| interrupts = <25 IRQ_TYPE_EDGE_RISING>; | ||
| interrupt-names = "DRDY"; | ||
| }; | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,129 @@ | ||
| .. SPDX-License-Identifier: GPL-2.0 | ||
| ==================================================================== | ||
| Notes on Oxford Semiconductor PCIe (Tornado) 950 serial port devices | ||
| ==================================================================== | ||
|
|
||
| Oxford Semiconductor PCIe (Tornado) 950 serial port devices are driven | ||
| by a fixed 62.5MHz clock input derived from the 100MHz PCI Express clock. | ||
|
|
||
| The baud rate produced by the baud generator is obtained from this input | ||
| frequency by dividing it by the clock prescaler, which can be set to any | ||
| value from 1 to 63.875 in increments of 0.125, and then the usual 16-bit | ||
| divisor is used as with the original 8250, to divide the frequency by a | ||
| value from 1 to 65535. Finally a programmable oversampling rate is used | ||
| that can take any value from 4 to 16 to divide the frequency further and | ||
| determine the actual baud rate used. Baud rates from 15625000bps down | ||
| to 0.933bps can be obtained this way. | ||
|
|
||
| By default the oversampling rate is set to 16 and the clock prescaler is | ||
| set to 33.875, meaning that the frequency to be used as the reference | ||
| for the usual 16-bit divisor is 115313.653, which is close enough to the | ||
| frequency of 115200 used by the original 8250 for the same values to be | ||
| used for the divisor to obtain the requested baud rates by software that | ||
| is unaware of the extra clock controls available. | ||
|
|
||
| The oversampling rate is programmed with the TCR register and the clock | ||
| prescaler is programmed with the CPR/CPR2 register pair[1][2][3][4]. | ||
| To switch away from the default value of 33.875 for the prescaler the | ||
| the enhanced mode has to be explicitly enabled though, by setting bit 4 | ||
| of the EFR. In that mode setting bit 7 in the MCR enables the prescaler | ||
| or otherwise it is bypassed as if the value of 1 was used. Additionally | ||
| writing any value to CPR clears CPR2 for compatibility with old software | ||
| written for older conventional PCI Oxford Semiconductor devices that do | ||
| not have the extra prescaler's 9th bit in CPR2, so the CPR/CPR2 register | ||
| pair has to be programmed in the right order. | ||
|
|
||
| By using these parameters rates from 15625000bps down to 1bps can be | ||
| obtained, with either exact or highly-accurate actual bit rates for | ||
| standard and many non-standard rates. | ||
|
|
||
| Here are the figures for the standard and some non-standard baud rates | ||
| (including those quoted in Oxford Semiconductor documentation), giving | ||
| the requested rate (r), the actual rate yielded (a) and its deviation | ||
| from the requested rate (d), and the values of the oversampling rate | ||
| (tcr), the clock prescaler (cpr) and the divisor (div) produced by the | ||
| new `get_divisor' handler: | ||
|
|
||
| r: 15625000, a: 15625000.00, d: 0.0000%, tcr: 4, cpr: 1.000, div: 1 | ||
| r: 12500000, a: 12500000.00, d: 0.0000%, tcr: 5, cpr: 1.000, div: 1 | ||
| r: 10416666, a: 10416666.67, d: 0.0000%, tcr: 6, cpr: 1.000, div: 1 | ||
| r: 8928571, a: 8928571.43, d: 0.0000%, tcr: 7, cpr: 1.000, div: 1 | ||
| r: 7812500, a: 7812500.00, d: 0.0000%, tcr: 8, cpr: 1.000, div: 1 | ||
| r: 4000000, a: 4000000.00, d: 0.0000%, tcr: 5, cpr: 3.125, div: 1 | ||
| r: 3686400, a: 3676470.59, d: -0.2694%, tcr: 8, cpr: 2.125, div: 1 | ||
| r: 3500000, a: 3496503.50, d: -0.0999%, tcr: 13, cpr: 1.375, div: 1 | ||
| r: 3000000, a: 2976190.48, d: -0.7937%, tcr: 14, cpr: 1.500, div: 1 | ||
| r: 2500000, a: 2500000.00, d: 0.0000%, tcr: 10, cpr: 2.500, div: 1 | ||
| r: 2000000, a: 2000000.00, d: 0.0000%, tcr: 10, cpr: 3.125, div: 1 | ||
| r: 1843200, a: 1838235.29, d: -0.2694%, tcr: 16, cpr: 2.125, div: 1 | ||
| r: 1500000, a: 1492537.31, d: -0.4975%, tcr: 5, cpr: 8.375, div: 1 | ||
| r: 1152000, a: 1152073.73, d: 0.0064%, tcr: 14, cpr: 3.875, div: 1 | ||
| r: 921600, a: 919117.65, d: -0.2694%, tcr: 16, cpr: 2.125, div: 2 | ||
| r: 576000, a: 576036.87, d: 0.0064%, tcr: 14, cpr: 3.875, div: 2 | ||
| r: 460800, a: 460829.49, d: 0.0064%, tcr: 7, cpr: 3.875, div: 5 | ||
| r: 230400, a: 230414.75, d: 0.0064%, tcr: 14, cpr: 3.875, div: 5 | ||
| r: 115200, a: 115207.37, d: 0.0064%, tcr: 14, cpr: 1.250, div: 31 | ||
| r: 57600, a: 57603.69, d: 0.0064%, tcr: 8, cpr: 3.875, div: 35 | ||
| r: 38400, a: 38402.46, d: 0.0064%, tcr: 14, cpr: 3.875, div: 30 | ||
| r: 19200, a: 19201.23, d: 0.0064%, tcr: 8, cpr: 3.875, div: 105 | ||
| r: 9600, a: 9600.06, d: 0.0006%, tcr: 9, cpr: 1.125, div: 643 | ||
| r: 4800, a: 4799.98, d: -0.0004%, tcr: 7, cpr: 2.875, div: 647 | ||
| r: 2400, a: 2400.02, d: 0.0008%, tcr: 9, cpr: 2.250, div: 1286 | ||
| r: 1200, a: 1200.00, d: 0.0000%, tcr: 14, cpr: 2.875, div: 1294 | ||
| r: 300, a: 300.00, d: 0.0000%, tcr: 11, cpr: 2.625, div: 7215 | ||
| r: 200, a: 200.00, d: 0.0000%, tcr: 16, cpr: 1.250, div: 15625 | ||
| r: 150, a: 150.00, d: 0.0000%, tcr: 13, cpr: 2.250, div: 14245 | ||
| r: 134, a: 134.00, d: 0.0000%, tcr: 11, cpr: 2.625, div: 16153 | ||
| r: 110, a: 110.00, d: 0.0000%, tcr: 12, cpr: 1.000, div: 47348 | ||
| r: 75, a: 75.00, d: 0.0000%, tcr: 4, cpr: 5.875, div: 35461 | ||
| r: 50, a: 50.00, d: 0.0000%, tcr: 16, cpr: 1.250, div: 62500 | ||
| r: 25, a: 25.00, d: 0.0000%, tcr: 16, cpr: 2.500, div: 62500 | ||
| r: 4, a: 4.00, d: 0.0000%, tcr: 16, cpr: 20.000, div: 48828 | ||
| r: 2, a: 2.00, d: 0.0000%, tcr: 16, cpr: 40.000, div: 48828 | ||
| r: 1, a: 1.00, d: 0.0000%, tcr: 16, cpr: 63.875, div: 61154 | ||
|
|
||
| With the baud base set to 15625000 and the unsigned 16-bit UART_DIV_MAX | ||
| limitation imposed by `serial8250_get_baud_rate' standard baud rates | ||
| below 300bps become unavailable in the regular way, e.g. the rate of | ||
| 200bps requires the baud base to be divided by 78125 and that is beyond | ||
| the unsigned 16-bit range. The historic spd_cust feature can still be | ||
| used by encoding the values for, the prescaler, the oversampling rate | ||
| and the clock divisor (DLM/DLL) as follows to obtain such rates if so | ||
| required: | ||
|
|
||
| 31 29 28 20 19 16 15 0 | ||
| +-----+-----------------+-------+-------------------------------+ | ||
| |0 0 0| CPR2:CPR | TCR | DLM:DLL | | ||
| +-----+-----------------+-------+-------------------------------+ | ||
|
|
||
| Use a value such encoded for the `custom_divisor' field along with the | ||
| ASYNC_SPD_CUST flag set in the `flags' field in `struct serial_struct' | ||
| passed with the TIOCSSERIAL ioctl(2), such as with the setserial(8) | ||
| utility and its `divisor' and `spd_cust' parameters, and the select | ||
| the baud rate of 38400bps. Note that the value of 0 in TCR sets the | ||
| oversampling rate to 16 and prescaler values below 1 in CPR2/CPR are | ||
| clamped by the driver to 1. | ||
|
|
||
| For example the value of 0x1f4004e2 will set CPR2/CPR, TCR and DLM/DLL | ||
| respectively to 0x1f4, 0x0 and 0x04e2, choosing the prescaler value, | ||
| the oversampling rate and the clock divisor of 62.500, 16 and 1250 | ||
| respectively. These parameters will set the baud rate for the serial | ||
| port to 62500000 / 62.500 / 1250 / 16 = 50bps. | ||
|
|
||
| References: | ||
|
|
||
| [1] "OXPCIe200 PCI Express Multi-Port Bridge", Oxford Semiconductor, | ||
| Inc., DS-0045, 10 Nov 2008, Section "950 Mode", pp. 64-65 | ||
|
|
||
| [2] "OXPCIe952 PCI Express Bridge to Dual Serial & Parallel Port", | ||
| Oxford Semiconductor, Inc., DS-0046, Mar 06 08, Section "950 Mode", | ||
| p. 20 | ||
|
|
||
| [3] "OXPCIe954 PCI Express Bridge to Quad Serial Port", Oxford | ||
| Semiconductor, Inc., DS-0047, Feb 08, Section "950 Mode", p. 20 | ||
|
|
||
| [4] "OXPCIe958 PCI Express Bridge to Octal Serial Port", Oxford | ||
| Semiconductor, Inc., DS-0048, Feb 08, Section "950 Mode", p. 20 | ||
|
|
||
| Maciej W. Rozycki <macro@orcam.me.uk> |
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