[PATCH v2 0/3] diverse at91 related fixes

[PATCH v2 0/3] diverse at91 related fixes

[Sam Ravnborg]

This is a rework of the two patches sent earlier + an extra patch.
With these patches my AT91SAM9263EK board boots barebox.

clk: fix clk_get error handling
- changed based on feedback from Uwe, test for -ENOENT

gpiolib: fix: do not access oftree on non-OFDEVICE boards
- rebased on top of Alexenaders original fix

And a third patch that just adds a missing static (found while browsing code)

diffstat:

 arch/arm/mach-at91/bootstrap.c |    2 +-
 drivers/clk/clkdev.c           |    2 +-
 drivers/gpio/gpiolib.c         |    8 +++++++-
 3 files changed, 9 insertions(+), 3 deletions(-)

	Sam

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[PATCH 1/3] clk: fix clk_get error handling

[Sam Ravnborg]

From 20397009e13e6111c8b17e5cbaf0addf3aaf593a Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <srn@skov.dk>
Date: Mon, 3 Jul 2017 21:21:02 +0200
Subject: [PATCH 1/3] clk: fix clk_get error handling
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

If there is no OFTREE support of_clk_get_by_name failed with
-ENOENT, which caused clk_get to bail out.
This had the effect that nothing was printed on the serial console
with at91sam9263-ek.

There are no error paths that will return -ENODEV as we test for today,
so change this to -ENOENT which is in use.
This allows us to contine with clk_get_sys() in case of other
errors as was the intention of the original fix.

Fixes: 90f7eacb ("clk: let clk_get return errors from of_clk_get_by_name")
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/clk/clkdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 6b1666355..abdc41527 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -181,7 +181,7 @@ struct clk *clk_get(struct device_d *dev, const char *con_id)
 
 	if (dev) {
 		clk = of_clk_get_by_name(dev->device_node, con_id);
-		if (!IS_ERR(clk) || PTR_ERR(clk) != -ENODEV)
+		if (!IS_ERR(clk) || PTR_ERR(clk) != -ENOENT)
 			return clk;
 	}
 
-- 
2.12.0


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[PATCH 2/3] gpio: fix null pointer exception when there is no oftree

[Sam Ravnborg]

From d10f426e1b8cec7de257dabf59e7fe53a591b3c1 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <srn@skov.dk>
Date: Mon, 3 Jul 2017 22:07:41 +0200
Subject: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree

In a system with oftree support enabled but with no oftree the
of_gpiochip_scan_hogs() would fail due to device_node equals NULL.

Check device_node and return with 0 in this situation, as this
mirrors what would have happened before we added support for gpio-hogs.

Use IS_ENABLED(CONFIG_OFDEVICE) to teach compiler to leave
out the of_* specific functions if not needed.

Fixes: 37e6bee7 ("gpiolib: Add support for GPIO "hog" nodes")
Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/gpio/gpiolib.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a3e17ada0..2bd8ef2a8 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip *chip)
 	struct device_node *np;
 	int ret, i;
 
+	if (!chip->dev->device_node)
+		return 0;
+
 	for_each_available_child_of_node(chip->dev->device_node, np) {
 		if (!of_property_read_bool(np, "gpio-hog"))
 			continue;
@@ -416,7 +419,10 @@ int gpiochip_add(struct gpio_chip *chip)
 	for (i = chip->base; i < chip->base + chip->ngpio; i++)
 		gpio_desc[i].chip = chip;
 
-	return of_gpiochip_scan_hogs(chip);
+	if (IS_ENABLED(CONFIG_OFDEVICE))
+		return of_gpiochip_scan_hogs(chip);
+	else
+		return 0;
 }
 
 void gpiochip_remove(struct gpio_chip *chip)
-- 
2.12.0


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[PATCH 3/3] arm: at91 bootstrap: declare local function static

[Sam Ravnborg]

From 8eb65eccbdd304ba4fb06e8de2a958791e0077f0 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <srn@skov.dk>
Date: Wed, 5 Jul 2017 08:52:19 +0200
Subject: [PATCH 3/3] arm: at91 bootstrap: declare local function static

Function is only used in this file and no prototype exist
in any header.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 arch/arm/mach-at91/bootstrap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-at91/bootstrap.c b/arch/arm/mach-at91/bootstrap.c
index 9dd575b74..5d21b2d02 100644
--- a/arch/arm/mach-at91/bootstrap.c
+++ b/arch/arm/mach-at91/bootstrap.c
@@ -149,7 +149,7 @@ static void boot_reset_action(struct menu *m, struct menu_entry *me)
 	restart_machine();
 }
 
-void at91_bootstrap_menu(void)
+static void at91_bootstrap_menu(void)
 {
 	struct menu *m;
 	struct menu_entry *me;
-- 
2.12.0


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Re: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree

[Lucas Stach]

Am Mittwoch, den 05.07.2017, 20:33 +0200 schrieb Sam Ravnborg:
> From d10f426e1b8cec7de257dabf59e7fe53a591b3c1 Mon Sep 17 00:00:00 2001
> From: Sam Ravnborg <srn@skov.dk>
> Date: Mon, 3 Jul 2017 22:07:41 +0200
> Subject: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree
> 
> In a system with oftree support enabled but with no oftree the
> of_gpiochip_scan_hogs() would fail due to device_node equals NULL.
> 
> Check device_node and return with 0 in this situation, as this
> mirrors what would have happened before we added support for gpio-hogs.
> 
> Use IS_ENABLED(CONFIG_OFDEVICE) to teach compiler to leave
> out the of_* specific functions if not needed.
> 
> Fixes: 37e6bee7 ("gpiolib: Add support for GPIO "hog" nodes")
> Signed-off-by: Alexander Kurz <akurz@blala.de>
> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> ---
>  drivers/gpio/gpiolib.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a3e17ada0..2bd8ef2a8 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip *chip)
>  	struct device_node *np;
>  	int ret, i;
>  
> +	if (!chip->dev->device_node)
> +		return 0;
> +
>  	for_each_available_child_of_node(chip->dev->device_node, np) {
>  		if (!of_property_read_bool(np, "gpio-hog"))
>  			continue;
> @@ -416,7 +419,10 @@ int gpiochip_add(struct gpio_chip *chip)
>  	for (i = chip->base; i < chip->base + chip->ngpio; i++)
>  		gpio_desc[i].chip = chip;
>  
> -	return of_gpiochip_scan_hogs(chip);
> +	if (IS_ENABLED(CONFIG_OFDEVICE))
> +		return of_gpiochip_scan_hogs(chip);
> +	else
> +		return 0;
>  }
>  
>  void gpiochip_remove(struct gpio_chip *chip)

I think this can be simplified to:

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a3e17ada0d39..1a373ef149a5 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip
*chip)
        struct device_node *np;
        int ret, i;

+       if (!IS_ENABLED(CONFIG_OFDEVICE) || !chip->dev->device_node)
+               return 0;
+
        for_each_available_child_of_node(chip->dev->device_node, np) {
                if (!of_property_read_bool(np, "gpio-hog"))
                        continue;

The optimizer should be able to work this out. Can you check that this
works for you? No need to resend, if it works I'll just commit this.

Regards,
Lucas


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Re: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree

[Alexander Kurz]

On Thu, 6 Jul 2017, Lucas Stach wrote:

> Am Mittwoch, den 05.07.2017, 20:33 +0200 schrieb Sam Ravnborg:
> > From d10f426e1b8cec7de257dabf59e7fe53a591b3c1 Mon Sep 17 00:00:00 2001
> > From: Sam Ravnborg <srn@skov.dk>
> > Date: Mon, 3 Jul 2017 22:07:41 +0200
> > Subject: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree
> > 
> > In a system with oftree support enabled but with no oftree the
> > of_gpiochip_scan_hogs() would fail due to device_node equals NULL.
> > 
> > Check device_node and return with 0 in this situation, as this
> > mirrors what would have happened before we added support for gpio-hogs.
> > 
> > Use IS_ENABLED(CONFIG_OFDEVICE) to teach compiler to leave
> > out the of_* specific functions if not needed.
> > 
> > Fixes: 37e6bee7 ("gpiolib: Add support for GPIO "hog" nodes")
> > Signed-off-by: Alexander Kurz <akurz@blala.de>
> > Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> > ---
> >  drivers/gpio/gpiolib.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index a3e17ada0..2bd8ef2a8 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip *chip)
> >  	struct device_node *np;
> >  	int ret, i;
> >  
> > +	if (!chip->dev->device_node)
> > +		return 0;
> > +
> >  	for_each_available_child_of_node(chip->dev->device_node, np) {
> >  		if (!of_property_read_bool(np, "gpio-hog"))
> >  			continue;
> > @@ -416,7 +419,10 @@ int gpiochip_add(struct gpio_chip *chip)
> >  	for (i = chip->base; i < chip->base + chip->ngpio; i++)
> >  		gpio_desc[i].chip = chip;
> >  
> > -	return of_gpiochip_scan_hogs(chip);
> > +	if (IS_ENABLED(CONFIG_OFDEVICE))
> > +		return of_gpiochip_scan_hogs(chip);
> > +	else
> > +		return 0;
> >  }
> >  
> >  void gpiochip_remove(struct gpio_chip *chip)
> 
> I think this can be simplified to:
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index a3e17ada0d39..1a373ef149a5 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip
> *chip)
>         struct device_node *np;
>         int ret, i;
> 
> +       if (!IS_ENABLED(CONFIG_OFDEVICE) || !chip->dev->device_node)
> +               return 0;
> +
>         for_each_available_child_of_node(chip->dev->device_node, np) {
>                 if (!of_property_read_bool(np, "gpio-hog"))
>                         continue;
> 
> The optimizer should be able to work this out. Can you check that this
> works for you? No need to resend, if it works I'll just commit this.
This works perfecty fine with gcc-5.2 and gcc-4.6
(although gcc-4.6 compatibilty broke with commit 4ef026c3048)

Thanks, Alexander

> 
> Regards,
> Lucas
> 

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Re: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree

[Lucas Stach]

Am Donnerstag, den 06.07.2017, 22:53 +0200 schrieb Alexander Kurz:
> 
> On Thu, 6 Jul 2017, Lucas Stach wrote:
> 
> > Am Mittwoch, den 05.07.2017, 20:33 +0200 schrieb Sam Ravnborg:
> > > From d10f426e1b8cec7de257dabf59e7fe53a591b3c1 Mon Sep 17 00:00:00 2001
> > > From: Sam Ravnborg <srn@skov.dk>
> > > Date: Mon, 3 Jul 2017 22:07:41 +0200
> > > Subject: [PATCH 2/3] gpio: fix null pointer exception when there is no oftree
> > > 
> > > In a system with oftree support enabled but with no oftree the
> > > of_gpiochip_scan_hogs() would fail due to device_node equals NULL.
> > > 
> > > Check device_node and return with 0 in this situation, as this
> > > mirrors what would have happened before we added support for gpio-hogs.
> > > 
> > > Use IS_ENABLED(CONFIG_OFDEVICE) to teach compiler to leave
> > > out the of_* specific functions if not needed.
> > > 
> > > Fixes: 37e6bee7 ("gpiolib: Add support for GPIO "hog" nodes")
> > > Signed-off-by: Alexander Kurz <akurz@blala.de>
> > > Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
> > > ---
> > >  drivers/gpio/gpiolib.c | 8 +++++++-
> > >  1 file changed, 7 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > > index a3e17ada0..2bd8ef2a8 100644
> > > --- a/drivers/gpio/gpiolib.c
> > > +++ b/drivers/gpio/gpiolib.c
> > > @@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip *chip)
> > >  	struct device_node *np;
> > >  	int ret, i;
> > >  
> > > +	if (!chip->dev->device_node)
> > > +		return 0;
> > > +
> > >  	for_each_available_child_of_node(chip->dev->device_node, np) {
> > >  		if (!of_property_read_bool(np, "gpio-hog"))
> > >  			continue;
> > > @@ -416,7 +419,10 @@ int gpiochip_add(struct gpio_chip *chip)
> > >  	for (i = chip->base; i < chip->base + chip->ngpio; i++)
> > >  		gpio_desc[i].chip = chip;
> > >  
> > > -	return of_gpiochip_scan_hogs(chip);
> > > +	if (IS_ENABLED(CONFIG_OFDEVICE))
> > > +		return of_gpiochip_scan_hogs(chip);
> > > +	else
> > > +		return 0;
> > >  }
> > >  
> > >  void gpiochip_remove(struct gpio_chip *chip)
> > 
> > I think this can be simplified to:
> > 
> > diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> > index a3e17ada0d39..1a373ef149a5 100644
> > --- a/drivers/gpio/gpiolib.c
> > +++ b/drivers/gpio/gpiolib.c
> > @@ -379,6 +379,9 @@ static int of_gpiochip_scan_hogs(struct gpio_chip
> > *chip)
> >         struct device_node *np;
> >         int ret, i;
> > 
> > +       if (!IS_ENABLED(CONFIG_OFDEVICE) || !chip->dev->device_node)
> > +               return 0;
> > +
> >         for_each_available_child_of_node(chip->dev->device_node, np) {
> >                 if (!of_property_read_bool(np, "gpio-hog"))
> >                         continue;
> > 
> > The optimizer should be able to work this out. Can you check that this
> > works for you? No need to resend, if it works I'll just commit this.
> This works perfecty fine with gcc-5.2 and gcc-4.6
> (although gcc-4.6 compatibilty broke with commit 4ef026c3048)

Thanks, all. I've pushed the reworked patch together with 1/3 to master.
Patch 3/3 is applied for -next.

Regards,
Lucas



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