2024-06-14 07:59:39

by Shengjiu Wang

Subject: [PATCH v8 2/5] clk: imx: clk-audiomix: Add reset controller

Audiomix block control can be a reset controller for
Enhanced Audio Return Channel (EARC), which is one of
modules in this audiomix subsystem.

The reset controller is supported by the auxiliary device
framework.

Signed-off-by: Shengjiu Wang <[email protected]>
Reviewed-by: Frank Li <[email protected]>
---
drivers/clk/imx/Kconfig | 1 +
drivers/clk/imx/clk-imx8mp-audiomix.c | 63 +++++++++++++++++++++++++++
2 files changed, 64 insertions(+)

diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
index 6da0fba68225..6ff6d934848a 100644
--- a/drivers/clk/imx/Kconfig
+++ b/drivers/clk/imx/Kconfig
@@ -81,6 +81,7 @@ config CLK_IMX8MP
tristate "IMX8MP CCM Clock Driver"
depends on ARCH_MXC || COMPILE_TEST
select MXC_CLK
+ select AUXILIARY_BUS if RESET_CONTROLLER
help
Build the driver for i.MX8MP CCM Clock Driver

diff --git a/drivers/clk/imx/clk-imx8mp-audiomix.c b/drivers/clk/imx/clk-imx8mp-audiomix.c
index b381d6f784c8..517b1f88661b 100644
--- a/drivers/clk/imx/clk-imx8mp-audiomix.c
+++ b/drivers/clk/imx/clk-imx8mp-audiomix.c
@@ -5,6 +5,7 @@
* Copyright (C) 2022 Marek Vasut <[email protected]>
*/

+#include <linux/auxiliary_bus.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/io.h>
@@ -13,6 +14,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/slab.h>

#include <dt-bindings/clock/imx8mp-clock.h>

@@ -217,6 +219,63 @@ struct clk_imx8mp_audiomix_priv {
struct clk_hw_onecell_data clk_data;
};

+#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
+
+static void clk_imx8mp_audiomix_reset_unregister_adev(void *_adev)
+{
+ struct auxiliary_device *adev = _adev;
+
+ auxiliary_device_delete(adev);
+ auxiliary_device_uninit(adev);
+}
+
+static void clk_imx8mp_audiomix_reset_adev_release(struct device *dev)
+{
+ struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+ kfree(adev);
+}
+
+static int clk_imx8mp_audiomix_reset_controller_register(struct device *dev,
+ struct clk_imx8mp_audiomix_priv *priv)
+{
+ struct auxiliary_device *adev __free(kfree) = NULL;
+ int ret;
+
+ if (!of_property_present(dev->of_node, "#reset-cells"))
+ return 0;
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return -ENOMEM;
+
+ adev->name = "reset";
+ adev->dev.parent = dev;
+ adev->dev.release = clk_imx8mp_audiomix_reset_adev_release;
+
+ ret = auxiliary_device_init(adev);
+ if (ret)
+ return ret;
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ret;
+ }
+
+ return devm_add_action_or_reset(dev, clk_imx8mp_audiomix_reset_unregister_adev,
+ no_free_ptr(adev));
+}
+
+#else /* !CONFIG_RESET_CONTROLLER */
+
+static int clk_imx8mp_audiomix_reset_controller_register(struct clk_imx8mp_audiomix_priv *priv)
+{
+ return 0;
+}
+
+#endif /* !CONFIG_RESET_CONTROLLER */
+
static void clk_imx8mp_audiomix_save_restore(struct device *dev, bool save)
{
struct clk_imx8mp_audiomix_priv *priv = dev_get_drvdata(dev);
@@ -337,6 +396,10 @@ static int clk_imx8mp_audiomix_probe(struct platform_device *pdev)
if (ret)
goto err_clk_register;

+ ret = clk_imx8mp_audiomix_reset_controller_register(dev, priv);
+ if (ret)
+ goto err_clk_register;
+
pm_runtime_put_sync(dev);
return 0;

--
2.34.1

2024-06-14 10:18:13

by Marco Felsch

Subject: Re: [PATCH v8 2/5] clk: imx: clk-audiomix: Add reset controller

On 24-06-14, Shengjiu Wang wrote:
> Audiomix block control can be a reset controller for
> Enhanced Audio Return Channel (EARC), which is one of
> modules in this audiomix subsystem.
>
> The reset controller is supported by the auxiliary device
> framework.
>
> Signed-off-by: Shengjiu Wang <[email protected]>
> Reviewed-by: Frank Li <[email protected]>

Reviewed-by: Marco Felsch <[email protected]>