Re: [RFC PATCH v2 1/5] clk: meson: axg: move reset controller's code to separate module

From: Conor Dooley
Date: Tue Apr 09 2024 - 08:05:54 EST

On Mon, Apr 08, 2024 at 06:05:51PM +0100, Conor Dooley wrote:

> > > Seconded, the clk-mpfs/reset-mpfs and clk-starfive-jh7110-sys/reset-
> > > starfive-jh7110 drivers are examples of this.
> > >
> > > > The auxiliary device creation function can also be in the
> > > > drivers/reset/ directory so that the clk driver calls some function
> > > > to create and register the device.
> > >
> > > I'm undecided about this, do you think mpfs_reset_controller_register()
> > > and jh7110_reset_controller_register() should rather live with the
> > > reset aux drivers in drivers/reset/ ?
> >
> > Yes, and also mpfs_reset_read() and friends. We should pass the base
> > iomem pointer and parent device to mpfs_reset_adev_alloc() instead and
> > then move all that code into drivers/reset with some header file
> > exported function to call. That way the clk driver hands over the data
> > without having to implement half the implementation.
>
> I'll todo list that :)

Something like the below?

-- >8 --
From a12f281d2cb869bcd9a6ffc45d0c6a0d3aa2e9e2 Mon Sep 17 00:00:00 2001
From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Date: Tue, 9 Apr 2024 11:54:34 +0100
Subject: [PATCH] clock, reset: microchip: move all mpfs reset code to the
reset subsystem

<insert something here>

Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
drivers/clk/microchip/clk-mpfs.c | 90 +-------------------------------
drivers/reset/reset-mpfs.c | 74 +++++++++++++++++++++++---
include/soc/microchip/mpfs.h | 10 ++--
3 files changed, 73 insertions(+), 101 deletions(-)

diff --git a/drivers/clk/microchip/clk-mpfs.c b/drivers/clk/microchip/clk-mpfs.c
index 22eab91a6712..432080c35cec 100644
--- a/drivers/clk/microchip/clk-mpfs.c
+++ b/drivers/clk/microchip/clk-mpfs.c
@@ -4,7 +4,6 @@
*
* Copyright (C) 2020-2022 Microchip Technology Inc. All rights reserved.
*/
-#include <linux/auxiliary_bus.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/module.h>
@@ -361,93 +360,6 @@ static int mpfs_clk_register_periphs(struct device *dev, struct mpfs_periph_hw_c
return 0;
}

-/*
- * Peripheral clock resets
- */
-
-#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
-
-u32 mpfs_reset_read(struct device *dev)
-{
- struct mpfs_clock_data *clock_data = dev_get_drvdata(dev->parent);
-
- return readl_relaxed(clock_data->base + REG_SUBBLK_RESET_CR);
-}
-EXPORT_SYMBOL_NS_GPL(mpfs_reset_read, MCHP_CLK_MPFS);
-
-void mpfs_reset_write(struct device *dev, u32 val)
-{
- struct mpfs_clock_data *clock_data = dev_get_drvdata(dev->parent);
-
- writel_relaxed(val, clock_data->base + REG_SUBBLK_RESET_CR);
-}
-EXPORT_SYMBOL_NS_GPL(mpfs_reset_write, MCHP_CLK_MPFS);
-
-static void mpfs_reset_unregister_adev(void *_adev)
-{
- struct auxiliary_device *adev = _adev;
-
- auxiliary_device_delete(adev);
- auxiliary_device_uninit(adev);
-}
-
-static void mpfs_reset_adev_release(struct device *dev)
-{
- struct auxiliary_device *adev = to_auxiliary_dev(dev);
-
- kfree(adev);
-}
-
-static struct auxiliary_device *mpfs_reset_adev_alloc(struct mpfs_clock_data *clk_data)
-{
- struct auxiliary_device *adev;
- int ret;
-
- adev = kzalloc(sizeof(*adev), GFP_KERNEL);
- if (!adev)
- return ERR_PTR(-ENOMEM);
-
- adev->name = "reset-mpfs";
- adev->dev.parent = clk_data->dev;
- adev->dev.release = mpfs_reset_adev_release;
- adev->id = 666u;
-
- ret = auxiliary_device_init(adev);
- if (ret) {
- kfree(adev);
- return ERR_PTR(ret);
- }
-
- return adev;
-}
-
-static int mpfs_reset_controller_register(struct mpfs_clock_data *clk_data)
-{
- struct auxiliary_device *adev;
- int ret;
-
- adev = mpfs_reset_adev_alloc(clk_data);
- if (IS_ERR(adev))
- return PTR_ERR(adev);
-
- ret = auxiliary_device_add(adev);
- if (ret) {
- auxiliary_device_uninit(adev);
- return ret;
- }
-
- return devm_add_action_or_reset(clk_data->dev, mpfs_reset_unregister_adev, adev);
-}
-
-#else /* !CONFIG_RESET_CONTROLLER */
-
-static int mpfs_reset_controller_register(struct mpfs_clock_data *clk_data)
-{
- return 0;
-}
-
-#endif /* !CONFIG_RESET_CONTROLLER */
-
static int mpfs_clk_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -499,7 +411,7 @@ static int mpfs_clk_probe(struct platform_device *pdev)
if (ret)
return ret;

- return mpfs_reset_controller_register(clk_data);
+ return mpfs_reset_controller_register(dev, clk_data->base + REG_SUBBLK_RESET_CR);
}

static const struct of_device_id mpfs_clk_of_match_table[] = {
diff --git a/drivers/reset/reset-mpfs.c b/drivers/reset/reset-mpfs.c
index 7f3fb2d472f4..27cd68b4ee81 100644
--- a/drivers/reset/reset-mpfs.c
+++ b/drivers/reset/reset-mpfs.c
@@ -8,6 +8,7 @@
*/
#include <linux/auxiliary_bus.h>
#include <linux/delay.h>
+#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -28,10 +29,11 @@
/* block concurrent access to the soft reset register */
static DEFINE_SPINLOCK(mpfs_reset_lock);

+static void __iomem *mpfs_reset_addr;
+
/*
* Peripheral clock resets
*/
-
static int mpfs_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
unsigned long flags;
@@ -39,9 +41,9 @@ static int mpfs_assert(struct reset_controller_dev *rcdev, unsigned long id)

spin_lock_irqsave(&mpfs_reset_lock, flags);

- reg = mpfs_reset_read(rcdev->dev);
+ reg = readl(mpfs_reset_addr);
reg |= BIT(id);
- mpfs_reset_write(rcdev->dev, reg);
+ writel(reg, mpfs_reset_addr);

spin_unlock_irqrestore(&mpfs_reset_lock, flags);

@@ -55,9 +57,9 @@ static int mpfs_deassert(struct reset_controller_dev *rcdev, unsigned long id)

spin_lock_irqsave(&mpfs_reset_lock, flags);

- reg = mpfs_reset_read(rcdev->dev);
+ reg = readl(mpfs_reset_addr);
reg &= ~BIT(id);
- mpfs_reset_write(rcdev->dev, reg);
+ writel(reg, mpfs_reset_addr);

spin_unlock_irqrestore(&mpfs_reset_lock, flags);

@@ -66,7 +68,7 @@ static int mpfs_deassert(struct reset_controller_dev *rcdev, unsigned long id)

static int mpfs_status(struct reset_controller_dev *rcdev, unsigned long id)
{
- u32 reg = mpfs_reset_read(rcdev->dev);
+ u32 reg = readl(mpfs_reset_addr);

/*
* It is safe to return here as MPFS_NUM_RESETS makes sure the sign bit
@@ -137,9 +139,67 @@ static int mpfs_reset_probe(struct auxiliary_device *adev,
return devm_reset_controller_register(dev, rcdev);
}

+static void mpfs_reset_unregister_adev(void *_adev)
+{
+ struct auxiliary_device *adev = _adev;
+
+ auxiliary_device_delete(adev);
+ auxiliary_device_uninit(adev);
+}
+
+static void mpfs_reset_adev_release(struct device *dev)
+{
+ struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+ kfree(adev);
+}
+
+static struct auxiliary_device *mpfs_reset_adev_alloc(struct device *clk_dev)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return ERR_PTR(-ENOMEM);
+
+ adev->name = "reset-mpfs";
+ adev->dev.parent = clk_dev;
+ adev->dev.release = mpfs_reset_adev_release;
+ adev->id = 666u;
+
+ ret = auxiliary_device_init(adev);
+ if (ret) {
+ kfree(adev);
+ return ERR_PTR(ret);
+ }
+
+ return adev;
+}
+
+int mpfs_reset_controller_register(struct device *clk_dev, void __iomem *base)
+{
+ struct auxiliary_device *adev;
+ int ret;
+
+ mpfs_reset_addr = base;
+
+ adev = mpfs_reset_adev_alloc(clk_dev);
+ if (IS_ERR(adev))
+ return PTR_ERR(adev);
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ret;
+ }
+
+ return devm_add_action_or_reset(clk_dev, mpfs_reset_unregister_adev, adev);
+}
+
static const struct auxiliary_device_id mpfs_reset_ids[] = {
{
- .name = "clk_mpfs.reset-mpfs",
+ .name = "reset_mpfs.reset-mpfs",
},
{ }
};
diff --git a/include/soc/microchip/mpfs.h b/include/soc/microchip/mpfs.h
index 09722f83b0ca..0b756bf5e9bd 100644
--- a/include/soc/microchip/mpfs.h
+++ b/include/soc/microchip/mpfs.h
@@ -43,11 +43,11 @@ struct mtd_info *mpfs_sys_controller_get_flash(struct mpfs_sys_controller *mpfs_
#endif /* if IS_ENABLED(CONFIG_POLARFIRE_SOC_SYS_CTRL) */

#if IS_ENABLED(CONFIG_MCHP_CLK_MPFS)
-
-u32 mpfs_reset_read(struct device *dev);
-
-void mpfs_reset_write(struct device *dev, u32 val);
-
+#if IS_ENABLED(CONFIG_RESET_CONTROLLER)
+int mpfs_reset_controller_register(struct device *clk_dev, void __iomem *base);
+#else
+int mpfs_reset_controller_register(struct device *clk_dev, void* __iomem base) { return 0;}
+#endif /* if IS_ENABLED(CONFIG_RESET_CONTROLLER) */
#endif /* if IS_ENABLED(CONFIG_MCHP_CLK_MPFS) */

#endif /* __SOC_MPFS_H__ */
--
2.43.0



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