[PATCH 0/7] clk: at91: sckc: improve error path

[PATCH 0/7] clk: at91: sckc: improve error path

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Hi,

This series tries to improve error path for slow clock registrations
by adding functions to free resources and using them on failures.

It is created on top of patch series at [1].

Thank you,
Claudiu Beznea

[1] https://lore.kernel.org/lkml/1558433454-27971-1-git-send-email-claudiu.beznea@microchip.com/

Claudiu Beznea (7):
  clk: at91: sckc: add support to free slow oscillator
  clk: at91: sckc: add support to free slow rc oscillator
  clk: at91: sckc: add support to free slow clock osclillator
  clk: at91: sckc: improve error path for sam9x5 sck register
  clk: at91: sckc: remove unnecessary line
  clk: at91: sckc: improve error path for sama5d4 sck registration
  clk: at91: sckc: use dedicated functions to unregister clock

 drivers/clk/at91/sckc.c | 122 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 86 insertions(+), 36 deletions(-)

-- 
2.7.4

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[PATCH 1/7] clk: at91: sckc: add support to free slow oscillator

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Add support to free slow oscillator resources.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index 2c410f41b413..c1d7edd33416 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -166,6 +166,14 @@ at91_clk_register_slow_osc(void __iomem *sckcr,
 	return hw;
 }
 
+static void at91_clk_unregister_slow_osc(struct clk_hw *hw)
+{
+	struct clk_slow_osc *osc = to_clk_slow_osc(hw);
+
+	clk_hw_unregister(hw);
+	kfree(osc);
+}
+
 static unsigned long clk_slow_rc_osc_recalc_rate(struct clk_hw *hw,
 						 unsigned long parent_rate)
 {
-- 
2.7.4

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[PATCH 2/7] clk: at91: sckc: add support to free slow rc oscillator

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Add support to free slow rc oscillator resources.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index c1d7edd33416..492b139a7c15 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -268,6 +268,14 @@ at91_clk_register_slow_rc_osc(void __iomem *sckcr,
 	return hw;
 }
 
+static void at91_clk_unregister_slow_rc_osc(struct clk_hw *hw)
+{
+	struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
+
+	clk_hw_unregister(hw);
+	kfree(osc);
+}
+
 static int clk_sam9x5_slow_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct clk_sam9x5_slow *slowck = to_clk_sam9x5_slow(hw);
-- 
2.7.4

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[PATCH 3/7] clk: at91: sckc: add support to free slow clock osclillator

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Add support to free slow clock oscillator resources.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index 492b139a7c15..2a677c56f901 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -355,6 +355,14 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
 	return hw;
 }
 
+static void at91_clk_unregister_sam9x5_slow(struct clk_hw *hw)
+{
+	struct clk_sam9x5_slow *slowck = to_clk_sam9x5_slow(hw);
+
+	clk_hw_unregister(hw);
+	kfree(slowck);
+}
+
 static void __init at91sam9x5_sckc_register(struct device_node *np,
 					    unsigned int rc_osc_startup_us,
 					    const struct clk_slow_bits *bits)
-- 
2.7.4

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[PATCH 4/7] clk: at91: sckc: improve error path for sam9x5 sck register

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Improve error path for sam9x5 slow clock registration.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 50 +++++++++++++++++++++++++++++++------------------
 1 file changed, 32 insertions(+), 18 deletions(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index 2a677c56f901..a2b905c91085 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -371,16 +371,17 @@ static void __init at91sam9x5_sckc_register(struct device_node *np,
 	void __iomem *regbase = of_iomap(np, 0);
 	struct device_node *child = NULL;
 	const char *xtal_name;
-	struct clk_hw *hw;
+	struct clk_hw *slow_rc, *slow_osc, *slowck;
 	bool bypass;
+	int ret;
 
 	if (!regbase)
 		return;
 
-	hw = at91_clk_register_slow_rc_osc(regbase, parent_names[0], 32768,
-					   50000000, rc_osc_startup_us,
-					   bits);
-	if (IS_ERR(hw))
+	slow_rc = at91_clk_register_slow_rc_osc(regbase, parent_names[0],
+						32768, 50000000,
+						rc_osc_startup_us, bits);
+	if (IS_ERR(slow_rc))
 		return;
 
 	xtal_name = of_clk_get_parent_name(np, 0);
@@ -388,7 +389,7 @@ static void __init at91sam9x5_sckc_register(struct device_node *np,
 		/* DT backward compatibility */
 		child = of_get_compatible_child(np, "atmel,at91sam9x5-clk-slow-osc");
 		if (!child)
-			return;
+			goto unregister_slow_rc;
 
 		xtal_name = of_clk_get_parent_name(child, 0);
 		bypass = of_property_read_bool(child, "atmel,osc-bypass");
@@ -399,23 +400,36 @@ static void __init at91sam9x5_sckc_register(struct device_node *np,
 	}
 
 	if (!xtal_name)
-		return;
-
-	hw = at91_clk_register_slow_osc(regbase, parent_names[1], xtal_name,
-					1200000, bypass, bits);
-	if (IS_ERR(hw))
-		return;
+		goto unregister_slow_rc;
 
-	hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2,
-					   bits);
-	if (IS_ERR(hw))
-		return;
+	slow_osc = at91_clk_register_slow_osc(regbase, parent_names[1],
+					      xtal_name, 1200000, bypass, bits);
+	if (IS_ERR(slow_osc))
+		goto unregister_slow_rc;
 
-	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+	slowck = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names,
+					       2, bits);
+	if (IS_ERR(slowck))
+		goto unregister_slow_osc;
 
 	/* DT backward compatibility */
 	if (child)
-		of_clk_add_hw_provider(child, of_clk_hw_simple_get, hw);
+		ret = of_clk_add_hw_provider(child, of_clk_hw_simple_get,
+					     slowck);
+	else
+		ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, slowck);
+
+	if (WARN_ON(ret))
+		goto unregister_slowck;
+
+	return;
+
+unregister_slowck:
+	at91_clk_unregister_sam9x5_slow(slowck);
+unregister_slow_osc:
+	at91_clk_unregister_slow_osc(slow_osc);
+unregister_slow_rc:
+	at91_clk_unregister_slow_rc_osc(slow_rc);
 }
 
 static const struct clk_slow_bits at91sam9x5_bits = {
-- 
2.7.4

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[PATCH 5/7] clk: at91: sckc: remove unnecessary line

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Remove unnecessary line.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index a2b905c91085..c61b6c9ddb94 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -601,7 +601,6 @@ static void __init of_sama5d4_sckc_setup(struct device_node *np)
 	osc->startup_usec = 1200000;
 	osc->bits = &at91sama5d4_bits;
 
-	hw = &osc->hw;
 	ret = clk_hw_register(NULL, &osc->hw);
 	if (ret) {
 		kfree(osc);
-- 
2.7.4

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[PATCH 6/7] clk: at91: sckc: improve error path for sama5d4 sck registration

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Improve error path for sama5d4 sck registration.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 43 ++++++++++++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 15 deletions(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index c61b6c9ddb94..f7ad3e9414dc 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -568,7 +568,7 @@ static const struct clk_slow_bits at91sama5d4_bits = {
 static void __init of_sama5d4_sckc_setup(struct device_node *np)
 {
 	void __iomem *regbase = of_iomap(np, 0);
-	struct clk_hw *hw;
+	struct clk_hw *slow_rc, *slowck;
 	struct clk_sama5d4_slow_osc *osc;
 	struct clk_init_data init;
 	const char *xtal_name;
@@ -578,17 +578,18 @@ static void __init of_sama5d4_sckc_setup(struct device_node *np)
 	if (!regbase)
 		return;
 
-	hw = clk_hw_register_fixed_rate_with_accuracy(NULL, parent_names[0],
-						      NULL, 0, 32768,
-						      250000000);
-	if (IS_ERR(hw))
+	slow_rc = clk_hw_register_fixed_rate_with_accuracy(NULL,
+							   parent_names[0],
+							   NULL, 0, 32768,
+							   250000000);
+	if (IS_ERR(slow_rc))
 		return;
 
 	xtal_name = of_clk_get_parent_name(np, 0);
 
 	osc = kzalloc(sizeof(*osc), GFP_KERNEL);
 	if (!osc)
-		return;
+		goto unregister_slow_rc;
 
 	init.name = parent_names[1];
 	init.ops = &sama5d4_slow_osc_ops;
@@ -602,17 +603,29 @@ static void __init of_sama5d4_sckc_setup(struct device_node *np)
 	osc->bits = &at91sama5d4_bits;
 
 	ret = clk_hw_register(NULL, &osc->hw);
-	if (ret) {
-		kfree(osc);
-		return;
-	}
+	if (ret)
+		goto free_slow_osc_data;
 
-	hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2,
-					   &at91sama5d4_bits);
-	if (IS_ERR(hw))
-		return;
+	slowck = at91_clk_register_sam9x5_slow(regbase, "slowck",
+					       parent_names, 2,
+					       &at91sama5d4_bits);
+	if (IS_ERR(slowck))
+		goto unregister_slow_osc;
 
-	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+	ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, slowck);
+	if (WARN_ON(ret))
+		goto unregister_slowck;
+
+	return;
+
+unregister_slowck:
+	at91_clk_unregister_sam9x5_slow(slowck);
+unregister_slow_osc:
+	clk_hw_unregister(&osc->hw);
+free_slow_osc_data:
+	kfree(osc);
+unregister_slow_rc:
+	clk_hw_unregister(slow_rc);
 }
 CLK_OF_DECLARE(sama5d4_clk_sckc, "atmel,sama5d4-sckc",
 	       of_sama5d4_sckc_setup);
-- 
2.7.4

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[PATCH 7/7] clk: at91: sckc: use dedicated functions to unregister clock

[Claudiu.Beznea]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Use at91 specific functions to free all resources in case of error.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/sckc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index f7ad3e9414dc..42502830a56a 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -514,13 +514,13 @@ static void __init of_sam9x60_sckc_setup(struct device_node *np)
 	return;
 
 unregister_td_slck:
-	clk_hw_unregister(clk_data->hws[1]);
+	at91_clk_unregister_sam9x5_slow(clk_data->hws[1]);
 unregister_md_slck:
 	clk_hw_unregister(clk_data->hws[0]);
 clk_data_free:
 	kfree(clk_data);
 unregister_slow_osc:
-	clk_hw_unregister(slow_osc);
+	at91_clk_unregister_slow_osc(slow_osc);
 unregister_slow_rc:
 	clk_hw_unregister(slow_rc);
 }
-- 
2.7.4

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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Alexandre Belloni]

On 13/06/2019 15:37:06+0000, Claudiu.Beznea@microchip.com wrote:
> From: Claudiu Beznea <claudiu.beznea@microchip.com>
> 
> Hi,
> 
> This series tries to improve error path for slow clock registrations
> by adding functions to free resources and using them on failures.
> 

Does the platform even boot when the slow clock is not available? 

The TCB clocksource would fail at:

        tc.slow_clk = of_clk_get_by_name(node->parent, "slow_clk");
        if (IS_ERR(tc.slow_clk))
                return PTR_ERR(tc.slow_clk);


> It is created on top of patch series at [1].
> 
> Thank you,
> Claudiu Beznea
> 
> [1] https://lore.kernel.org/lkml/1558433454-27971-1-git-send-email-claudiu.beznea@microchip.com/
> 
> Claudiu Beznea (7):
>   clk: at91: sckc: add support to free slow oscillator
>   clk: at91: sckc: add support to free slow rc oscillator
>   clk: at91: sckc: add support to free slow clock osclillator
>   clk: at91: sckc: improve error path for sam9x5 sck register
>   clk: at91: sckc: remove unnecessary line
>   clk: at91: sckc: improve error path for sama5d4 sck registration
>   clk: at91: sckc: use dedicated functions to unregister clock
> 
>  drivers/clk/at91/sckc.c | 122 ++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 86 insertions(+), 36 deletions(-)
> 
> -- 
> 2.7.4
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Claudiu.Beznea]

Hi,

On 18.06.2019 12:55, Alexandre Belloni wrote:
> On 13/06/2019 15:37:06+0000, Claudiu.Beznea@microchip.com wrote:
>> From: Claudiu Beznea <claudiu.beznea@microchip.com>
>>
>> Hi,
>>
>> This series tries to improve error path for slow clock registrations
>> by adding functions to free resources and using them on failures.
>>
> 
> Does the platform even boot when the slow clock is not available? 
> 
> The TCB clocksource would fail at:
> 
>         tc.slow_clk = of_clk_get_by_name(node->parent, "slow_clk");
>         if (IS_ERR(tc.slow_clk))
>                 return PTR_ERR(tc.slow_clk);
> 

In case of using TC as clocksource, yes, the platform wouldn't boot if slow
clock is not available, because, anyway the TC needs it. PIT may work
without it (if slow clock is not used to drive the PIT).

For sure there are other IPs (which may be or are driven by slow clock)
which may not work if slow clock is driven them.

Anyway, please let me know if you feel this series has no meaning.

Thank you,
Claudiu Beznea

> 
>> It is created on top of patch series at [1].
>>
>> Thank you,
>> Claudiu Beznea
>>
>> [1] https://lore.kernel.org/lkml/1558433454-27971-1-git-send-email-claudiu.beznea@microchip.com/
>>
>> Claudiu Beznea (7):
>>   clk: at91: sckc: add support to free slow oscillator
>>   clk: at91: sckc: add support to free slow rc oscillator
>>   clk: at91: sckc: add support to free slow clock osclillator
>>   clk: at91: sckc: improve error path for sam9x5 sck register
>>   clk: at91: sckc: remove unnecessary line
>>   clk: at91: sckc: improve error path for sama5d4 sck registration
>>   clk: at91: sckc: use dedicated functions to unregister clock
>>
>>  drivers/clk/at91/sckc.c | 122 ++++++++++++++++++++++++++++++++++--------------
>>  1 file changed, 86 insertions(+), 36 deletions(-)
>>
>> -- 
>> 2.7.4
>>
> 
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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Alexandre Belloni]

On 20/06/2019 10:30:42+0000, Claudiu.Beznea@microchip.com wrote:
> Hi,
> 
> On 18.06.2019 12:55, Alexandre Belloni wrote:
> > On 13/06/2019 15:37:06+0000, Claudiu.Beznea@microchip.com wrote:
> >> From: Claudiu Beznea <claudiu.beznea@microchip.com>
> >>
> >> Hi,
> >>
> >> This series tries to improve error path for slow clock registrations
> >> by adding functions to free resources and using them on failures.
> >>
> > 
> > Does the platform even boot when the slow clock is not available? 
> > 
> > The TCB clocksource would fail at:
> > 
> >         tc.slow_clk = of_clk_get_by_name(node->parent, "slow_clk");
> >         if (IS_ERR(tc.slow_clk))
> >                 return PTR_ERR(tc.slow_clk);
> > 
> 
> In case of using TC as clocksource, yes, the platform wouldn't boot if slow
> clock is not available, because, anyway the TC needs it. PIT may work
> without it (if slow clock is not used to drive the PIT).
> 
> For sure there are other IPs (which may be or are driven by slow clock)
> which may not work if slow clock is driven them.
> 
> Anyway, please let me know if you feel this series has no meaning.
> 

Well, I'm not sure it is worth it but at the same time, it is not adding
many lines and you already developed it...


-- 
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Embedded Linux and Kernel engineering
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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Stephen Boyd]

Quoting Alexandre Belloni (2019-06-21 02:33:02)
> On 20/06/2019 10:30:42+0000, Claudiu.Beznea@microchip.com wrote:
> > Hi,
> > 
> > On 18.06.2019 12:55, Alexandre Belloni wrote:
> > > On 13/06/2019 15:37:06+0000, Claudiu.Beznea@microchip.com wrote:
> > >> From: Claudiu Beznea <claudiu.beznea@microchip.com>
> > >>
> > >> Hi,
> > >>
> > >> This series tries to improve error path for slow clock registrations
> > >> by adding functions to free resources and using them on failures.
> > >>
> > > 
> > > Does the platform even boot when the slow clock is not available? 
> > > 
> > > The TCB clocksource would fail at:
> > > 
> > >         tc.slow_clk = of_clk_get_by_name(node->parent, "slow_clk");
> > >         if (IS_ERR(tc.slow_clk))
> > >                 return PTR_ERR(tc.slow_clk);
> > > 
> > 
> > In case of using TC as clocksource, yes, the platform wouldn't boot if slow
> > clock is not available, because, anyway the TC needs it. PIT may work
> > without it (if slow clock is not used to drive the PIT).
> > 
> > For sure there are other IPs (which may be or are driven by slow clock)
> > which may not work if slow clock is driven them.
> > 
> > Anyway, please let me know if you feel this series has no meaning.
> > 
> 
> Well, I'm not sure it is worth it but at the same time, it is not adding
> many lines and you already developed it...
> 

Is that a Reviewed-by or a Rejected-by tag?


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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Alexandre Belloni]

On 26/06/2019 11:53:59-0700, Stephen Boyd wrote:
> Quoting Alexandre Belloni (2019-06-21 02:33:02)
> > On 20/06/2019 10:30:42+0000, Claudiu.Beznea@microchip.com wrote:
> > > Hi,
> > > 
> > > On 18.06.2019 12:55, Alexandre Belloni wrote:
> > > > On 13/06/2019 15:37:06+0000, Claudiu.Beznea@microchip.com wrote:
> > > >> From: Claudiu Beznea <claudiu.beznea@microchip.com>
> > > >>
> > > >> Hi,
> > > >>
> > > >> This series tries to improve error path for slow clock registrations
> > > >> by adding functions to free resources and using them on failures.
> > > >>
> > > > 
> > > > Does the platform even boot when the slow clock is not available? 
> > > > 
> > > > The TCB clocksource would fail at:
> > > > 
> > > >         tc.slow_clk = of_clk_get_by_name(node->parent, "slow_clk");
> > > >         if (IS_ERR(tc.slow_clk))
> > > >                 return PTR_ERR(tc.slow_clk);
> > > > 
> > > 
> > > In case of using TC as clocksource, yes, the platform wouldn't boot if slow
> > > clock is not available, because, anyway the TC needs it. PIT may work
> > > without it (if slow clock is not used to drive the PIT).
> > > 
> > > For sure there are other IPs (which may be or are driven by slow clock)
> > > which may not work if slow clock is driven them.
> > > 
> > > Anyway, please let me know if you feel this series has no meaning.
> > > 
> > 
> > Well, I'm not sure it is worth it but at the same time, it is not adding
> > many lines and you already developed it...
> > 
> 
> Is that a Reviewed-by or a Rejected-by tag?
> 

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>


-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Stephen Boyd]

Quoting Claudiu.Beznea@microchip.com (2019-06-13 08:37:06)
> From: Claudiu Beznea <claudiu.beznea@microchip.com>
> 
> Hi,
> 
> This series tries to improve error path for slow clock registrations
> by adding functions to free resources and using them on failures.

If possible, resend this patch series in plain text. Thanks.


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Re: [PATCH 0/7] clk: at91: sckc: improve error path

[Claudiu.Beznea]

On 27.06.2019 18:03, Stephen Boyd wrote:
> External E-Mail
> 
> 
> Quoting Claudiu.Beznea@microchip.com (2019-06-13 08:37:06)
>> From: Claudiu Beznea <claudiu.beznea@microchip.com>
>>
>> Hi,
>>
>> This series tries to improve error path for slow clock registrations
>> by adding functions to free resources and using them on failures.
> 
> If possible, resend this patch series in plain text. Thanks.

Done! Thank you!

> 
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