From 20265b09dc6bbfb8c708accf6c0cf67f63cb79c3 Mon Sep 17 00:00:00 2001 From: Victor Ding Date: Wed, 2 Nov 2022 08:24:41 +0000 Subject: drivers/i2c/sx9324: Add support for Linux's SX9324 driver SX9324 driver is updated per Linux's documentation found at https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/iio/proximity/semtech,sx9324.yaml Supporting logic for the deprecated SX932x driver is hence guarded by DRIVERS_I2C_SX9324_SUPPORT_LEGACY_LINUX_DRIVER This patch by itself does not introduce functional changes to any board. The legacy SX932x Linux driver never reached upstream Linux and is only available in ChromeOS kernel fork of 4.4 and 5.4. Linux later accepted a different implementation named SX9324 and has been available since 5.4. Ideally all variants should adopt the new driver; however, during the transition phase, coreboot must support both drivers. It is better to have a single firmware build that can work with both Linux kernel drivers by specifying both sets of properties. Legacy driver support should be deleted once all variants finish migration. BUG=b:242662878 TEST=Dump ACPI SSDT then verify _DSD entries related to the legacy SX932x driver are identical w/ and w/o this patch (Tested on Craask and Nivviks) Change-Id: I42cd6841c3a270c242ed2e739db245e858eadb3b Signed-off-by: Victor Ding Reviewed-on: https://review.coreboot.org/c/coreboot/+/69192 Reviewed-by: Reka Norman Reviewed-by: Tarun Tuli Tested-by: build bot (Jenkins) Reviewed-by: Eric Lai --- src/drivers/i2c/sx9324/chip.h | 141 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) (limited to 'src/drivers/i2c/sx9324/chip.h') diff --git a/src/drivers/i2c/sx9324/chip.h b/src/drivers/i2c/sx9324/chip.h index 9c9dd3cf35..47910fb7a0 100644 --- a/src/drivers/i2c/sx9324/chip.h +++ b/src/drivers/i2c/sx9324/chip.h @@ -23,7 +23,148 @@ struct drivers_i2c_sx9324_config { /* IO-APIC interrupt */ struct acpi_irq irq; + + /* + semtech,ph0-pin: + description: | + Array of 3 entries. Index represent the id of the CS pin. + Value indicates how each CS pin is used during phase 0. + Each of the 3 pins have the following value - + 0 : unused (high impedance) + 1 : measured input + 2 : dynamic shield + 3 : grounded. + For instance, CS0 measured, CS1 shield and CS2 ground is [1, 2, 3] + items: + enum: [ 0, 1, 2, 3 ] + minItems: 3 + maxItems: 3 + */ + uint64_t ph0_pin[3]; + + /* + semtech,ph1-pin: + Same as ph0-pin for phase 1. + */ + uint64_t ph1_pin[3]; + + /* + semtech,ph2-pin: + Same as ph0-pin for phase 2. + */ + uint64_t ph2_pin[3]; + + /* + semtech,ph3-pin: + Same as ph0-pin for phase 3. + */ + uint64_t ph3_pin[3]; + + /* + semtech,ph01-resolution: + enum: [8, 16, 32, 64, 128, 256, 512, 1024] + description: + Capacitance measurement resolution. For phase 0 and 1. + Higher the number, higher the resolution. + default: 128 + */ + uint64_t ph01_resolution; + + /* + semtech,ph23-resolution: + Same as ph01-resolution for phase 2 and 3. + */ + uint64_t ph23_resolution; + + /* + semtech,startup-sensor: + enum: [0, 1, 2, 3] + default: 0 + description: | + Phase used for start-up proximity detection. + It is used when we enable a phase to remove static offset and measure + only capacitance changes introduced by the user. + */ + uint64_t startup_sensor; + + /* + semtech,ph01-proxraw-strength: + minimum: 0 + maximum: 7 + default: 1 + description: + PROXRAW filter strength for phase 0 and 1. A value of 0 represents off, + and other values represent 1-1/2^N. + */ + uint64_t ph01_proxraw_strength; + + /* + semtech,ph23-proxraw-strength: + Same as proxraw-strength01, for phase 2 and 3. + */ + uint64_t ph23_proxraw_strength; + + /* + semtech,avg-pos-strength: + enum: [0, 16, 64, 128, 256, 512, 1024, 4294967295] + default: 16 + description: | + Average positive filter strength. A value of 0 represents off and + UINT_MAX (4294967295) represents infinite. Other values + represent 1-1/N. + */ + uint64_t avg_pos_strength; + + /* + semtech,cs-idle-sleep: + description: + State of CS pins during sleep mode and idle time. + enum: + - hi-z + - gnd + - vdd + */ + const char *cs_idle_sleep; + + /* + semtech,int-comp-resistor: + description: + Internal resistor setting for compensation. + enum: + - lowest + - low + - high + - highest + */ + const char *int_comp_resistor; + + /* + semtech,input-precharge-resistor-ohms: + default: 4000 + multipleOf: 2000 + minimum: 0 + maximum: 30000 + description: + Pre-charge input resistance in Ohm. + */ + uint64_t input_precharge_resistor_ohms; + + /* + semtech,input-analog-gain: + minimum: 0 + maximum: 3 + description: | + Defines the input antenna analog gain + 0: x1.247 + 1: x1 (default) + 2: x0.768 + 3: x0.552 + */ + uint64_t input_analog_gain; + +#if CONFIG(DRIVERS_I2C_SX9324_SUPPORT_LEGACY_LINUX_DRIVER) #include "registers.h" +#endif }; #undef REGISTER -- cgit v1.2.3