linux-kernel - [PATCH v2 1/2] clk: Store clk_core for clk_rate

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Message-Id: <20221018-clk-rate-request-tracing-v2-1-5170b363c413@cerno.tech>
Date:   Wed, 26 Oct 2022 15:46:58 +0200
From:   maxime@...no.tech
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Maxime Ripard <maxime@...no.tech>, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: [PATCH v2 1/2] clk: Store clk_core for clk_rate_request

The struct clk_rate_request is meant to store the context around a rate
request such as the parent, boundaries, and so on.

However, it doesn't store the clock the rate request is submitted to,
which makes debugging difficult.

Let's add a pointer to the relevant clk_core instance in order to
improve the debugging of rate requests in a subsequent patch.

Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/clk/clk.c            | 1 +
 include/linux/clk-provider.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 11c41d987ff4..bc6f964cb676 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1468,6 +1468,7 @@ static void clk_core_init_rate_req(struct clk_core * const core,
 	if (!core)
 		return;
 
+	req->core = core;
 	req->rate = rate;
 	clk_core_get_boundaries(core, &req->min_rate, &req->max_rate);
 
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 267cd06b54a0..842e72a5348f 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -44,6 +44,7 @@ struct dentry;
  *
  * Should be initialized by calling clk_hw_init_rate_request().
  *
+ * @core: 		Pointer to the struct clk_core affected by this request
  * @rate:		Requested clock rate. This field will be adjusted by
  *			clock drivers according to hardware capabilities.
  * @min_rate:		Minimum rate imposed by clk users.
@@ -55,6 +56,7 @@ struct dentry;
  *
  */
 struct clk_rate_request {
+	struct clk_core *core;
 	unsigned long rate;
 	unsigned long min_rate;
 	unsigned long max_rate;

-- 
b4 0.10.1