thermal/drivers/sun8i: Fix some error handling paths in sun8i_ths_probe()

Should an error occur after calling sun8i_ths_resource_init() in the probe
function, some resources need to be released, as already done in the
.remove() function.

Switch to the devm_clk_get_enabled() helper and add a new devm_action to
turn sun8i_ths_resource_init() into a fully managed function.

Move the place where reset_control_deassert() is called so that the
recommended order of reset release/clock enable steps is kept.
A64 manual states that:

	3.3.6.4. Gating and reset

	Make sure that the reset signal has been released before the release of
	module clock gating;

This fixes the issue and removes some LoC at the same time.

Fixes: dccc5c3b6f30 ("thermal/drivers/sun8i: Add thermal driver for H6/H5/H3/A64/A83T/R40")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/a8ae84bd2dc4b55fe428f8e20f31438bf8bb6762.1684089931.git.christophe.jaillet@wanadoo.fr

diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
index 793ddce..d4d2416 100644 (file)
--- a/drivers/thermal/sun8i_thermal.c
+++ b/drivers/thermal/sun8i_thermal.c
@@ -319,6 +319,11 @@ out:
        return ret;
 }
 
+static void sun8i_ths_reset_control_assert(void *data)
+{
+       reset_control_assert(data);
+}
+
 static int sun8i_ths_resource_init(struct ths_device *tmdev)
 {
        struct device *dev = tmdev->dev;
@@ -339,47 +344,35 @@ static int sun8i_ths_resource_init(struct ths_device *tmdev)
                if (IS_ERR(tmdev->reset))
                        return PTR_ERR(tmdev->reset);
 
-               tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus");
+               ret = reset_control_deassert(tmdev->reset);
+               if (ret)
+                       return ret;
+
+               ret = devm_add_action_or_reset(dev, sun8i_ths_reset_control_assert,
+                                              tmdev->reset);
+               if (ret)
+                       return ret;
+
+               tmdev->bus_clk = devm_clk_get_enabled(&pdev->dev, "bus");
                if (IS_ERR(tmdev->bus_clk))
                        return PTR_ERR(tmdev->bus_clk);
        }
 
        if (tmdev->chip->has_mod_clk) {
-               tmdev->mod_clk = devm_clk_get(&pdev->dev, "mod");
+               tmdev->mod_clk = devm_clk_get_enabled(&pdev->dev, "mod");
                if (IS_ERR(tmdev->mod_clk))
                        return PTR_ERR(tmdev->mod_clk);
        }
 
-       ret = reset_control_deassert(tmdev->reset);
-       if (ret)
-               return ret;
-
-       ret = clk_prepare_enable(tmdev->bus_clk);
-       if (ret)
-               goto assert_reset;
-
        ret = clk_set_rate(tmdev->mod_clk, 24000000);
        if (ret)
-               goto bus_disable;
-
-       ret = clk_prepare_enable(tmdev->mod_clk);
-       if (ret)
-               goto bus_disable;
+               return ret;
 
        ret = sun8i_ths_calibrate(tmdev);
        if (ret)
-               goto mod_disable;
+               return ret;
 
        return 0;
-
-mod_disable:
-       clk_disable_unprepare(tmdev->mod_clk);
-bus_disable:
-       clk_disable_unprepare(tmdev->bus_clk);
-assert_reset:
-       reset_control_assert(tmdev->reset);
-
-       return ret;
 }
 
 static int sun8i_h3_thermal_init(struct ths_device *tmdev)
@@ -530,17 +523,6 @@ static int sun8i_ths_probe(struct platform_device *pdev)
        return 0;
 }
 
-static int sun8i_ths_remove(struct platform_device *pdev)
-{
-       struct ths_device *tmdev = platform_get_drvdata(pdev);
-
-       clk_disable_unprepare(tmdev->mod_clk);
-       clk_disable_unprepare(tmdev->bus_clk);
-       reset_control_assert(tmdev->reset);
-
-       return 0;
-}
-
 static const struct ths_thermal_chip sun8i_a83t_ths = {
        .sensor_num = 3,
        .scale = 705,
@@ -642,7 +624,6 @@ MODULE_DEVICE_TABLE(of, of_ths_match);
 
 static struct platform_driver ths_driver = {
        .probe = sun8i_ths_probe,
-       .remove = sun8i_ths_remove,
        .driver = {
                .name = "sun8i-thermal",
                .of_match_table = of_ths_match,