linux-kernel - [PATCH v12 2/5] memory: tegra124-emc: Continue probing if timings are missing in device-tree

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Date:   Mon, 28 Dec 2020 18:49:17 +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>,
        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>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH v12 2/5] memory: tegra124-emc: Continue probing if timings are missing in device-tree

EMC driver will become mandatory after turning it into interconnect
provider because interconnect users, like display controller driver, will
fail to probe using newer device-trees that have interconnect properties.
Thus make EMC driver to probe even if timings are missing in device-tree.

Tested-by: Nicolas Chauvet <kwizart@...il.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/memory/tegra/tegra124-emc.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/drivers/memory/tegra/tegra124-emc.c b/drivers/memory/tegra/tegra124-emc.c
index edfbf6d6d357..8fb8c1af25c9 100644
--- a/drivers/memory/tegra/tegra124-emc.c
+++ b/drivers/memory/tegra/tegra124-emc.c
@@ -1201,23 +1201,15 @@ static int tegra_emc_probe(struct platform_device *pdev)
 	ram_code = tegra_read_ram_code();
 
 	np = tegra_emc_find_node_by_ram_code(pdev->dev.of_node, ram_code);
-	if (!np) {
-		dev_err(&pdev->dev,
-			"no memory timings for RAM code %u found in DT\n",
-			ram_code);
-		return -ENOENT;
-	}
-
-	err = tegra_emc_load_timings_from_dt(emc, np);
-	of_node_put(np);
-	if (err)
-		return err;
-
-	if (emc->num_timings == 0) {
-		dev_err(&pdev->dev,
-			"no memory timings for RAM code %u registered\n",
-			ram_code);
-		return -ENOENT;
+	if (np) {
+		err = tegra_emc_load_timings_from_dt(emc, np);
+		of_node_put(np);
+		if (err)
+			return err;
+	} else {
+		dev_info(&pdev->dev,
+			 "no memory timings for RAM code %u found in DT\n",
+			 ram_code);
 	}
 
 	err = emc_init(emc);
-- 
2.29.2