linux-kernel - [PATCH v4 27/37] interconnect: Relax requirement in of_icc_get_from

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Message-Id: <20200609131404.17523-28-digetx@gmail.com>
Date:   Tue,  9 Jun 2020 16:13:54 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>
Cc:     Artur Świgoń <a.swigon@...sung.com>,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: [PATCH v4 27/37] interconnect: Relax requirement in of_icc_get_from_provider()

From: Artur Świgoń <a.swigon@...sung.com>

This patch relaxes the condition in of_icc_get_from_provider() so that it
is no longer required to set #interconnect-cells = <1> in the DT. In case
of the devfreq driver for exynos-bus, #interconnect-cells is always zero.

Signed-off-by: Artur Świgoń <a.swigon@...sung.com>
[digetx@...il.com: added cells_num checking for of_icc_xlate_onecell()]
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/interconnect/core.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index e5f998744501..cb143421ca67 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -339,7 +339,7 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
 	struct icc_node *node = ERR_PTR(-EPROBE_DEFER);
 	struct icc_provider *provider;
 
-	if (!spec || spec->args_count != 1)
+	if (!spec)
 		return ERR_PTR(-EINVAL);
 
 	mutex_lock(&icc_lock);
@@ -967,6 +967,15 @@ EXPORT_SYMBOL_GPL(icc_nodes_remove);
  */
 int icc_provider_add(struct icc_provider *provider)
 {
+	struct device_node *np = provider->dev->of_node;
+	u32 cells_num;
+	int err;
+
+	err = of_property_read_u32(np, "#interconnect-cells", &cells_num);
+	if (WARN_ON(err))
+		return err;
+	if (WARN_ON(provider->xlate == of_icc_xlate_onecell && cells_num != 1))
+		return -EINVAL;
 	if (WARN_ON(!provider->set))
 		return -EINVAL;
 	if (WARN_ON(!provider->xlate))
-- 
2.26.0