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The MIPI DisCo device properties that are read by the driver from platform firmware, or hard-coded in the driver, should only be provided as sysfs entries when a driver probes successfully. However the device status and device number is updated even when there is no driver present, and hence can be updated when a Slave device is detected on the bus without being described in platform firmware and without any driver registered/probed. As suggested by GregKH, the attribute group for Slave status and device number is is added by default upon device registration. Credits to Vinod Koul for the status_show() function, shared in a separate patch and used as is here. The status table was modified to remove an unnecessary enum and status_show() is handled in a different group attribute than what was suggested by Vinod. Tested-by: Srinivas Kandgatla <srinivas.kandagatla@linaro.org> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Co-developed-by: Vinod Koul <vkoul@kernel.org> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20200924194430.121058-3-pierre-louis.bossart@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
109 lines
4.8 KiB
Text
109 lines
4.8 KiB
Text
What: /sys/bus/soundwire/devices/sdw:.../status
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/sys/bus/soundwire/devices/sdw:.../device_number
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Date: September 2020
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Contact: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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Bard Liao <yung-chuan.liao@linux.intel.com>
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Vinod Koul <vkoul@kernel.org>
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Description: SoundWire Slave status
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These properties report the Slave status, e.g. if it
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is UNATTACHED or not, and in the latter case show the
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device_number. This status information is useful to
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detect devices exposed by platform firmware but not
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physically present on the bus, and conversely devices
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not exposed in platform firmware but enumerated.
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What: /sys/bus/soundwire/devices/sdw:.../dev-properties/mipi_revision
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/sys/bus/soundwire/devices/sdw:.../dev-properties/wake_capable
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/sys/bus/soundwire/devices/sdw:.../dev-properties/test_mode_capable
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/sys/bus/soundwire/devices/sdw:.../dev-properties/clk_stop_mode1
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/sys/bus/soundwire/devices/sdw:.../dev-properties/simple_clk_stop_capable
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/sys/bus/soundwire/devices/sdw:.../dev-properties/clk_stop_timeout
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/sys/bus/soundwire/devices/sdw:.../dev-properties/ch_prep_timeout
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/sys/bus/soundwire/devices/sdw:.../dev-properties/reset_behave
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/sys/bus/soundwire/devices/sdw:.../dev-properties/high_PHY_capable
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/sys/bus/soundwire/devices/sdw:.../dev-properties/paging_support
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/sys/bus/soundwire/devices/sdw:.../dev-properties/bank_delay_support
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/sys/bus/soundwire/devices/sdw:.../dev-properties/p15_behave
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/sys/bus/soundwire/devices/sdw:.../dev-properties/master_count
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/sys/bus/soundwire/devices/sdw:.../dev-properties/source_ports
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/sys/bus/soundwire/devices/sdw:.../dev-properties/sink_ports
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Date: May 2020
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Contact: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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Bard Liao <yung-chuan.liao@linux.intel.com>
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Vinod Koul <vkoul@kernel.org>
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Description: SoundWire Slave DisCo properties.
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These properties are defined by MIPI DisCo Specification
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for SoundWire. They define various properties of the
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SoundWire Slave and are used by the bus to configure
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the Slave
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What: /sys/bus/soundwire/devices/sdw:.../dp0/max_word
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/sys/bus/soundwire/devices/sdw:.../dp0/min_word
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/sys/bus/soundwire/devices/sdw:.../dp0/words
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/sys/bus/soundwire/devices/sdw:.../dp0/BRA_flow_controlled
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/sys/bus/soundwire/devices/sdw:.../dp0/simple_ch_prep_sm
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/sys/bus/soundwire/devices/sdw:.../dp0/imp_def_interrupts
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Date: May 2020
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Contact: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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Bard Liao <yung-chuan.liao@linux.intel.com>
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Vinod Koul <vkoul@kernel.org>
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Description: SoundWire Slave Data Port-0 DisCo properties.
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These properties are defined by MIPI DisCo Specification
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for the SoundWire. They define various properties of the
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Data port 0 are used by the bus to configure the Data Port 0.
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What: /sys/bus/soundwire/devices/sdw:.../dpN_src/max_word
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/sys/bus/soundwire/devices/sdw:.../dpN_src/min_word
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/sys/bus/soundwire/devices/sdw:.../dpN_src/words
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/sys/bus/soundwire/devices/sdw:.../dpN_src/type
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/sys/bus/soundwire/devices/sdw:.../dpN_src/max_grouping
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/sys/bus/soundwire/devices/sdw:.../dpN_src/simple_ch_prep_sm
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/sys/bus/soundwire/devices/sdw:.../dpN_src/ch_prep_timeout
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/sys/bus/soundwire/devices/sdw:.../dpN_src/imp_def_interrupts
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/sys/bus/soundwire/devices/sdw:.../dpN_src/min_ch
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/sys/bus/soundwire/devices/sdw:.../dpN_src/max_ch
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/sys/bus/soundwire/devices/sdw:.../dpN_src/channels
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/sys/bus/soundwire/devices/sdw:.../dpN_src/ch_combinations
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/sys/bus/soundwire/devices/sdw:.../dpN_src/max_async_buffer
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/sys/bus/soundwire/devices/sdw:.../dpN_src/block_pack_mode
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/sys/bus/soundwire/devices/sdw:.../dpN_src/port_encoding
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/max_word
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/min_word
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/words
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/type
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/max_grouping
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/simple_ch_prep_sm
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/ch_prep_timeout
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/imp_def_interrupts
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/min_ch
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/max_ch
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/channels
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/ch_combinations
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/max_async_buffer
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/block_pack_mode
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/sys/bus/soundwire/devices/sdw:.../dpN_sink/port_encoding
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Date: May 2020
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Contact: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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Bard Liao <yung-chuan.liao@linux.intel.com>
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Vinod Koul <vkoul@kernel.org>
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Description: SoundWire Slave Data Source/Sink Port-N DisCo properties.
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These properties are defined by MIPI DisCo Specification
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for SoundWire. They define various properties of the
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Source/Sink Data port N and are used by the bus to configure
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the Data Port N.
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