[PATCH v8 03/26] memory: tegra20-emc: Factor out clk initialization

Dmitry Osipenko
2020-11-11T01:15:23Z

Factor out clk initialization and make it resource-managed. This makes
easier to follow code and will help to make further changes cleaner.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/memory/tegra/tegra20-emc.c | 70 ++++++++++++++++++++----------
1 file changed, 47 insertions(+), 23 deletions(-)

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index bb3f315c9587..d01b556a6d06 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -960,6 +960,49 @@ static int tegra_emc_opp_table_init(struct tegra_emc *emc)
return err;
}

+static void devm_tegra_emc_unset_callback(void *data)
+{
+ tegra20_clk_set_emc_round_callback(NULL, NULL);
+}
+
+static void devm_tegra_emc_unreg_clk_notifier(void *data)
+{
+ struct tegra_emc *emc = data;
+
+ clk_notifier_unregister(emc->clk, &emc->clk_nb);
+}
+
+static int tegra_emc_init_clk(struct tegra_emc *emc)
+{
+ int err;
+
+ tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
+
+ err = devm_add_action_or_reset(emc->dev, devm_tegra_emc_unset_callback,
+ NULL);
+ if (err)
+ return err;
+
+ emc->clk = devm_clk_get(emc->dev, NULL);
+ if (IS_ERR(emc->clk)) {
+ dev_err(emc->dev, "failed to get EMC clock: %pe\n", emc->clk);
+ return PTR_ERR(emc->clk);
+ }
+
+ err = clk_notifier_register(emc->clk, &emc->clk_nb);
+ if (err) {
+ dev_err(emc->dev, "failed to register clk notifier: %d\n", err);
+ return err;
+ }
+
+ err = devm_add_action_or_reset(emc->dev,
+ devm_tegra_emc_unreg_clk_notifier, emc);
+ if (err)
+ return err;
+
+ return 0;
+}
+
static int tegra_emc_probe(struct platform_device *pdev)
{
struct device_node *np;
@@ -1003,25 +1046,13 @@ 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);
- goto unset_cb;
- }
-
- err = clk_notifier_register(emc->clk, &emc->clk_nb);
- if (err) {
- dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
- err);
- goto unset_cb;
- }
+ err = tegra_emc_init_clk(emc);
+ if (err)
+ return err;

err = tegra_emc_opp_table_init(emc);
if (err)
- goto unreg_notifier;
+ return err;

platform_set_drvdata(pdev, emc);
tegra_emc_rate_requests_init(emc);
@@ -1036,13 +1067,6 @@ static int tegra_emc_probe(struct platform_device *pdev)
try_module_get(THIS_MODULE);

return 0;
-
-unreg_notifier:
- clk_notifier_unregister(emc->clk, &emc->clk_nb);
-unset_cb:
- tegra20_clk_set_emc_round_callback(NULL, NULL);
-
- return err;
}

static const struct of_device_id tegra_emc_of_match[] = {
--
2.29.2