v4 -> v5: - pick up tags - uintXY_t -> uXY - driver.name = "rpm_master_stats" -> "qcom_rpm_master_stats" - use dev_err_probe for debugfs file creation fail - use PTR_ERR(dent) intead of -EINVAL for debugfs file creation fail v4: https://lore.kernel.org/r/20230405-topic-master_stats-v4-0-4217362fcc79@xxxxxxxxxx v3 -> v4: - Use "data" instead of "d" for naming local struct master_stats_data * - Add "qcom_" prefix in the debugfs path - Add "Qualcomm" prefix in MODULE_NAME - Make the struct __packed__ to avoid padding surprises (even though it looks like there shouldn't be any, by eye) - use IS_ERR for checking debugfs_create_file return value instead of nullchecking, that apparently changed.. - Use -ENODEV instead of -EINVAL when a MSG RAM handle is not found - Add missing of_node_put() after of_parse_phandle() - Vastly improve the documentation bit v3: https://lore.kernel.org/r/20230405-topic-master_stats-v3-0-2cb2ba4f2092@xxxxxxxxxx v2 -> v3: - rename rpm-master-stats.yaml to qcom,rpm-master-stats.yaml v2: https://lore.kernel.org/r/20230405-topic-master_stats-v2-0-51c304ecb610@xxxxxxxxxx v1 -> v2: - Drop the `-` in /properties/compatible to make our entry be of the correct type [1/2] - Change %s to %d for printing out the iterator [2/2] v1: https://lore.kernel.org/r/20230405-topic-master_stats-v1-0-1b1fa2739953@xxxxxxxxxx The RPM MSG ram includes per-subsystem low-power mode entry/exit/ residence/etc. statistics which are very useful for trying to debug what I'd call "SoC insomnia", or IOW the plaftorm refusing to drop the voltage rails to a minimum and gate the non-critical clocks. This series adds a very short and simple driver to query that data and expose it through debugfs. The base used for writing this driver is: https://github.com/sonyxperiadev/kernel/blob/aosp/LA.UM.9.14.r1/drivers/soc/qcom/rpm_master_stat.c Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> --- Konrad Dybcio (2): dt-bindings: soc: qcom: Add RPM Master stats soc: qcom: Introduce RPM master stats driver .../bindings/soc/qcom/qcom,rpm-master-stats.yaml | 69 +++++++++ drivers/soc/qcom/Kconfig | 11 ++ drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/rpm_master_stats.c | 163 +++++++++++++++++++++ 4 files changed, 244 insertions(+) --- base-commit: 67d5d9f013d6c3829383c08162939cabff14fccc change-id: 20230405-topic-master_stats-ba201a9af93d Best regards, -- Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
