The output pins of the general PWM timer (GPT) can be disabled by using the port output enabling function for the GPT (POEG). Specifically, either of the following ways can be used. * Input level detection of the GTETRGA to GTETRGD pins. * Output-disable request from the GPT. * Register setting(ie, by setting POEGGn.SSF to 1) This patch series adds support for configuring output disable function using DT and handling of user control and events are handled by char device. Patch #3 to patch #10 are just for testing only. When dead time error occurs or the GTIOCA pin output value is the same as the GTIOCB pin output value, output protection is required. GPT detects this condition and generates output disable requests to POEG based on the settings in the output disable request permission bits, such as GTINTAD.GRPDTE, GTINTAD.GRPABH, GTINTAD.GRPABL. After the POEG receives output disable requests from each channel and calculates external input using an OR operation, the POEG generates output disable requests to GPT. POEG handles output disable request and send an event to userspace. Userspace clears the fault condition and request poeg to cancel the output disable request. REF: https://lore.kernel.org/linux-renesas-soc/20220510151112.16249-1-biju.das.jz@xxxxxxxxxxxxxx/ https://lore.kernel.org/linux-renesas-soc/20230306090014.128732-1-biju.das.jz@xxxxxxxxxxxxxx/T/#t logs: root@smarc-rzg2l:~# /poeg.sh Test case 1 user POEG control with renesas,poeg-config = <1>; [POEG]open [POEG] user control pin output disable enabled Read at address 0x10048434 (0xffff97de1434): 0x031B031B Read at address 0x10048438 (0xffff8353f438): 0x03000000 Read at address 0x10049400 (0xffff99960400): 0x00000008 [POEG] user control pin output disable disabled [POEG]close 73: 0 0 GICv3 357 Level 10049400.poeg Read at address 0x10048434 (0xffffb8252434): 0x031B031B Read at address 0x10048438 (0xffffbb61a438): 0x03000000 Read at address 0x10049400 (0xffff88783400): 0x00000000 root@smarc-rzg2l:~# root@smarc-rzg2l:~# /poeg.sh Test case 2 GPT control with renesas,poeg-config = <2>; [POEG]open [POEG] GPT control configure IRQ Read at address 0x10048434 (0xffffa60a2434): 0x031B031B Read at address 0x10048438 (0xffffa8c2c438): 0x23000000 Read at address 0x10049400 (0xffffbc09f400): 0x00000020 gpt ch:3, irq=2 gpt ch:3, irq=2 gpt ch:3, irq=2 gpt ch:3, irq=2 Read at address 0x10048434 (0xffff82111434): 0x021B031B Read at address 0x10048438 (0xffff9abfa438): 0x23000000 Read at address 0x10049400 (0xffff872ea400): 0x00000020 73: 5 0 GICv3 357 Level 10049400.poeg root@smarc-rzg2l:~# gpt ch:3, irq=2 root@smarc-rzg2l:~# /poeg.sh Test case 2 GPT control with renesas,poeg-config = <4>; [POEG]open [POEG] GPT control configure IRQ Read at address 0x10048434 (0xffff9bbea434): 0x031B031B Read at address 0x10048438 (0xffffa33fd438): 0x43000000 Read at address 0x10049400 (0xffffa4bdc400): 0x00000020 gpt ch:3, irq=4 gpt ch:3, irq=4 gpt ch:3, irq=4 gpt ch:3, irq=4 Read at address 0x10048434 (0xffff8e05e434): 0x021B031B Read at address 0x10048438 (0xffffbc765438): 0x43000000 Read at address 0x10049400 (0xffffa1ed1400): 0x00000020 73: 5 0 GICv3 357 Level 10049400.poeg root@smarc-rzg2l:~# gpt ch:3, irq=4 v6->v7: * Documented renesas,poeg-config optional property for configuring the system for pin output disable. * Used DT to handle the system configuration * Added poeg char device for user control support to enable/disable output from GPT * Replaced iowrite32/ioread32-> writel/readl * Dropped of_match_ptr from .of_match_table v5->v6: * Dropped binding patch as it is accepted for 6.4. * Added sysfs support for configuring pin output disable function in a generic way. v4->v5: * Added Rb tag from Rob. * Updated kernel version in sysfs doc. v3->v4: * Replaced companion->renesas,gpt for the phandle to gpt instance * Replaced renesas,id->renesas,poeg-id * Removed default from renesas,poeg-id as default for a required property doesn't make much sense. * Updated the example and required properties with above changes v2->v3: * Removed Rb tag from Rob as there are some changes introduced. * Added companion property, so that poeg can link with gpt device * Documented renesas,id, as identifier for POEGG{A,B,C,D}. * Updated the binding example. * Added sysfs documentation for output_disable * PWM_RZG2L_GPT implies ARCH_RZG2L. So removed ARCH_RZG2L dependency * Used dev_get_drvdata to get device data * Replaced sprintf->sysfs_emit in show(). v1->v2: * Updated binding description. * Renamed the file poeg-rzg2l->rzg2l-poeg * Removed the macro POEGG as there is only single register and updated rzg2l_poeg_write() and rzg2l_poeg_read() * Updated error handling in probe() REF->v1: * Modelled as pincontrol as most of its configuration is intended to be static and moved driver files from soc to pincontrol directory. * Updated reg size in dt binding example. * Updated Kconfig Biju Das (10): dt-bindings: pinctrl: rzg2l-poeg: Document renesas,poeg-config property drivers: pinctrl: renesas: Add RZ/G2L POEG driver support pwm: rzg2l-gpt: Add support for output disable request from gpt pinctrl: renesas: rzg2l-poeg: Add support for GPT Output-Disable Request pwm: rzg2l-gpt: Add support for output disable when both output low pinctrl: renesas: rzg2l-poeg: output-disable request from GPT when both outputs are low. pwm: rzg2l-gpt: Add support for output disable on dead time error pinctrl: renesas: rzg2l-poeg: output-disable request from GPT on dead time error pinctrl: renesas: rzg2l-poeg: output-disable request by external pin tools/poeg: Add test app for poeg .../bindings/pinctrl/renesas,rzg2l-poeg.yaml | 16 + drivers/pinctrl/renesas/Kconfig | 2 + drivers/pinctrl/renesas/Makefile | 2 + drivers/pinctrl/renesas/poeg/Kconfig | 11 + drivers/pinctrl/renesas/poeg/Makefile | 2 + drivers/pinctrl/renesas/poeg/rzg2l-poeg.c | 500 ++++++++++++++++++ drivers/pwm/pwm-rzg2l-gpt.c | 129 +++++ include/linux/pinctrl/rzg2l-poeg.h | 28 + include/linux/pwm/rzg2l-gpt.h | 44 ++ tools/poeg/Build | 1 + tools/poeg/Makefile | 53 ++ tools/poeg/poeg_app.c | 102 ++++ 12 files changed, 890 insertions(+) create mode 100644 drivers/pinctrl/renesas/poeg/Kconfig create mode 100644 drivers/pinctrl/renesas/poeg/Makefile create mode 100644 drivers/pinctrl/renesas/poeg/rzg2l-poeg.c create mode 100644 include/linux/pinctrl/rzg2l-poeg.h create mode 100644 include/linux/pwm/rzg2l-gpt.h create mode 100644 tools/poeg/Build create mode 100644 tools/poeg/Makefile create mode 100644 tools/poeg/poeg_app.c -- 2.25.1
