linux-kernel - [DO NOT APPLY PATCH v8 15/15] tools: poeg: Add support for handling GPT output request disable

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Message-ID: <20251121160842.371922-16-biju.das.jz@bp.renesas.com>
Date: Fri, 21 Nov 2025 16:08:22 +0000
From: Biju <biju.das.au@...il.com>
To: Uwe Kleine-König <ukleinek@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Linus Walleij <linus.walleij@...aro.org>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	linux-kernel@...r.kernel.org,
	linux-pwm@...r.kernel.org,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>,
	linux-renesas-soc@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: [DO NOT APPLY PATCH v8 15/15] tools: poeg: Add support for handling GPT output request disable

From: Biju Das <biju.das.jz@...renesas.com>

Add support for handling GPT output request disable. When GPT
detects output disable condition, it request POEG and POEG
triggers an interrupt after disabling the output. the clearing
of interrupt happens in GPT. Add support for handling this in
userspace, when POEG triggers interrupt, it sends an event to
user space and user space send clear command to clear the gpt
request for output disable.

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 tools/poeg/poeg_app.c | 57 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 47 insertions(+), 10 deletions(-)

diff --git a/tools/poeg/poeg_app.c b/tools/poeg/poeg_app.c
index 4ff8e5c007dc..71f130d5aad2 100644
--- a/tools/poeg/poeg_app.c
+++ b/tools/poeg/poeg_app.c
@@ -20,9 +20,11 @@
 
 int main(int argc, char *argv[])
 {
+	struct poeg_event event_data;
 	struct poeg_cmd cmd;
 	unsigned int val;
 	long cmd_val;
+	int ret, fd;
 	char *p;
 	int i;
 
@@ -36,17 +38,52 @@ int main(int argc, char *argv[])
 	else
 		printf("[POEG]open\n");
 
-	cmd.val = cmd_val;
-	cmd.channel = 4;
-	if (cmd.val == RZG2L_POEG_OUTPUT_DISABLE_USR_ENABLE_CMD)
-		printf("[POEG] user control pin output disable enabled\n");
-	else
-		printf("[POEG] user control pin output disable disabled\n");
+	if (cmd_val == RZG2L_POEG_OUTPUT_DISABLE_USR_ENABLE_CMD ||
+	    cmd_val == RZG2L_POEG_OUTPUT_DISABLE_USR_DISABLE_CMD) {
+		if (cmd_val == RZG2L_POEG_OUTPUT_DISABLE_USR_ENABLE_CMD)
+			printf("[POEG] user control pin output disable enabled\n");
+		else
+			printf("[POEG] user control pin output disable disabled\n");
+
+		cmd.val = cmd_val;
+		cmd.channel = 4;
+		ret = write(fd, &cmd, sizeof(cmd));
+		if (ret == -1) {
+			perror("Failed to write cmd data");
+			return 1;
+		}
+	} else {
+		printf("[POEG] GPT control configure IRQ\n");
+		cmd.val = RZG2L_POEG_GPT_CFG_IRQ_CMD;
+		cmd.channel = 4;
+		ret = write(fd, &cmd, sizeof(cmd));
+		if (ret == -1) {
+			perror("Failed to write cmd data");
+			return 1;
+		}
+
+		for (;;) {
+			ret = read(fd, &event_data, sizeof(event_data));
+			if (ret == -1) {
+				perror("Failed to read event data");
+				return 1;
+			}
 
-	ret = write(fd, &cmd, sizeof(cmd));
-	if (ret == -1) {
-		perror("Failed to write cmd data");
-		return 1;
+			val = event_data.gpt_disable_irq_status;
+			if (val) {
+				/* emulate fault clearing condition by adding delay */
+				sleep(2);
+				for (i = 0; i < 8; i++) {
+					if (val & 7) {
+						printf("gpt ch:%u, irq=%x\n", i, val & 7);
+						cmd.val = RZG2L_POEG_GPT_FAULT_CLR_CMD;
+						cmd.channel = 4;
+						ret = write(fd, &cmd, sizeof(cmd));
+					}
+					val >>= 3;
+				}
+			}
+		}
 	}
 
 	if (close(fd) != 0)
-- 
2.43.0