linux-kernel - [PATCH] opp: of: Allow lazy-linking of required-opps to non genpd

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Message-Id: <20210616053335.4181780-1-hsinyi@chromium.org>
Date:   Wed, 16 Jun 2021 13:33:35 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     "Viresh Kumar )" <vireshk@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "andrew-sh . cheng" <andrew-sh.cheng@...iatek.com>
Subject: [PATCH] opp: of: Allow lazy-linking of required-opps to non genpd

Don't limit required_opp_table to genpd only. One possible use case is
cpufreq based devfreq governor, which can use required-opps property to
derive devfreq from cpufreq.

Suggested-by: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
This is tested with the non genpd case mt8183-cci with passive
governor[1].
[1] https://patchwork.kernel.org/project/linux-mediatek/patch/1616499241-4906-2-git-send-email-andrew-sh.cheng@mediatek.com/
---
 drivers/opp/of.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index aa75a1caf08a3..9573facce53a5 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -201,17 +201,6 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
 			lazy = true;
 			continue;
 		}
-
-		/*
-		 * We only support genpd's OPPs in the "required-opps" for now,
-		 * as we don't know how much about other cases. Error out if the
-		 * required OPP doesn't belong to a genpd.
-		 */
-		if (!required_opp_tables[i]->is_genpd) {
-			dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
-				required_np);
-			goto free_required_tables;
-		}
 	}
 
 	/* Let's do the linking later on */
@@ -379,13 +368,6 @@ static void lazy_link_required_opp_table(struct opp_table *new_table)
 	struct dev_pm_opp *opp;
 	int i, ret;
 
-	/*
-	 * We only support genpd's OPPs in the "required-opps" for now,
-	 * as we don't know much about other cases.
-	 */
-	if (!new_table->is_genpd)
-		return;
-
 	mutex_lock(&opp_table_lock);
 
 	list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) {
@@ -873,7 +855,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
 		return ERR_PTR(-ENOMEM);
 
 	ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
-	if (ret < 0 && !opp_table->is_genpd) {
+	if (ret < 0) {
 		dev_err(dev, "%s: opp key field not found\n", __func__);
 		goto free_opp;
 	}
-- 
2.32.0.272.g935e593368-goog