spi: Add trace event support for GENI SE registers dump

Praveen Talari <praveen.talari@oss.qualcomm.com> says:

The GENI framework is used by multiple drivers including UART, I2C, and
SPI. When hardware-related failures occur, each driver typically relies
on local logging, which often lacks sufficient information to determine
the exact controller state.

This series introduces a common tracing mechanism for GENI Serial Engine
debug registers and demonstrates its use in the SPI driver.

Patch 1 adds a new tracepoint that captures an extensive set of GENI SE
registers, including command state, interrupt status, FIFO state, DMA
configuration, and clock-related information.

Patch 2 hooks the tracepoint into SPI error paths so that register
snapshots are automatically generated when timeouts or transfer-related
failures occur.

Usage examples:

Enable all I2C traces:
echo 1 > /sys/kernel/tracing/events/qcom_geni_se/enable

cat /sys/kernel/debug/tracing/trace_pipe

Example trace output:
114.291299: geni_se_regs: 888000.spi: m_cmd0=0x18000000
    m_irq_status=0x00000080 s_cmd0=0x00000000 s_irq_status=0x08000000
geni_status=0x00000000 geni_ios=0x00000000 m_cmd_ctrl=0x00000000
m_cmd_err=0x00000000 m_fw_err=0x00000000 tx_fifo_sts=0x00000000
rx_fifo_sts=0x00000000 tx_watermark=0x00000000 rx_watermark=0x0000000d
rx_watermark_rfr=0x0000000e m_gp_length=0x00000004 s_gp_length=0x00000000
dma_tx_irq=0x00000000 dma_rx_irq=0x00000000 dma_tx_irq_en=0x0000000f
dma_rx_irq_en=0x0000001f dma_rx_len=0x00001400 dma_rx_len_in=0x00001400
dma_tx_len=0x00001400 dma_tx_len_in=0x00001400 dma_tx_ptr_l=0xffffc000
dma_tx_ptr_h=0x00000000 dma_rx_ptr_l=0xffffa000 dma_rx_ptr_h=0x00000000
dma_tx_attr=0x00000001 dma_tx_max_burst=0x00000002 dma_rx_attr=0x00000000
dma_rx_max_burst=0x00000002 dma_if_en=0x00000009 dma_if_en_ro=0x00000001
dma_general_cfg=0x0000000f dma_qsb_trans_cfg=0x00000000 dma_dbg=0x00000000
m_irq_en=0x7fc0007f s_irq_en=0x03003e3e gsi_event_en=0x00000000
se_irq_en=0x0000000f ser_m_clk_cfg=0x000000a1 ser_s_clk_cfg=0x00000000
general_cfg=0x00000048 output_ctrl=0x0000007f clk_ctrl_ro=0x00000001
fifo_if_dis=0x00000000 fw_multilock_msa=0x00000000 clk_sel=0x00000005

Link: https://patch.msgid.link/20260729-add-tracepoints-for-se-reg-dump-v4-0-08bbd63b0ed2@oss.qualcomm.com

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