linux-kernel - [PATCH v3 3/8] memory: tegra20-emc: Adapt for clock driver changes

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Message-Id: <20190524172353.29087-4-digetx@gmail.com>
Date:   Fri, 24 May 2019 20:23:48 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Joseph Lo <josephl@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>
Cc:     devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 3/8] memory: tegra20-emc: Adapt for clock driver changes

The emc_mux clock is gone now and EMC driver should provide the clock
rounding functionality.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/memory/tegra/tegra20-emc.c | 55 ++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 10 deletions(-)

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index 55ac3863a354..d3e1f898d745 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk/tegra.h>
 #include <linux/completion.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
@@ -138,7 +139,6 @@ struct tegra_emc {
 	struct completion clk_handshake_complete;
 	struct notifier_block clk_nb;
 	struct clk *backup_clk;
-	struct clk *emc_mux;
 	struct clk *pll_m;
 	struct clk *clk;
 	void __iomem *regs;
@@ -424,6 +424,44 @@ static int emc_setup_hw(struct tegra_emc *emc)
 	return 0;
 }
 
+static long emc_round_rate(unsigned long rate,
+			   unsigned long min_rate,
+			   unsigned long max_rate,
+			   void *arg)
+{
+	struct emc_timing *timing = NULL;
+	struct tegra_emc *emc = arg;
+	unsigned int i;
+
+	min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate);
+
+	for (i = 0; i < emc->num_timings; i++) {
+		if (emc->timings[i].rate < rate && i != emc->num_timings - 1)
+			continue;
+
+		if (emc->timings[i].rate > max_rate) {
+			i = max(i, 1u) - 1;
+
+			if (emc->timings[i].rate < min_rate)
+				break;
+		}
+
+		if (emc->timings[i].rate < min_rate)
+			continue;
+
+		timing = &emc->timings[i];
+		break;
+	}
+
+	if (!timing) {
+		dev_err(emc->dev, "no timing for rate %lu min %lu max %lu\n",
+			rate, min_rate, max_rate);
+		return -EINVAL;
+	}
+
+	return timing->rate;
+}
+
 static int tegra_emc_probe(struct platform_device *pdev)
 {
 	struct device_node *np;
@@ -480,18 +518,20 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
+
 	emc->clk = devm_clk_get(&pdev->dev, "emc");
 	if (IS_ERR(emc->clk)) {
 		err = PTR_ERR(emc->clk);
 		dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);
-		return err;
+		goto unset_cb;
 	}
 
 	emc->pll_m = clk_get_sys(NULL, "pll_m");
 	if (IS_ERR(emc->pll_m)) {
 		err = PTR_ERR(emc->pll_m);
 		dev_err(&pdev->dev, "failed to get pll_m clock: %d\n", err);
-		return err;
+		goto unset_cb;
 	}
 
 	emc->backup_clk = clk_get_sys(NULL, "pll_p");
@@ -501,13 +541,6 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		goto put_pll_m;
 	}
 
-	emc->emc_mux = clk_get_parent(emc->clk);
-	if (IS_ERR(emc->emc_mux)) {
-		err = PTR_ERR(emc->emc_mux);
-		dev_err(&pdev->dev, "failed to get emc_mux clock: %d\n", err);
-		goto put_backup;
-	}
-
 	err = clk_notifier_register(emc->clk, &emc->clk_nb);
 	if (err) {
 		dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
@@ -521,6 +554,8 @@ static int tegra_emc_probe(struct platform_device *pdev)
 	clk_put(emc->backup_clk);
 put_pll_m:
 	clk_put(emc->pll_m);
+unset_cb:
+	tegra20_clk_set_emc_round_callback(NULL, NULL);
 
 	return err;
 }
-- 
2.21.0