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Message-ID: <20150411005117.19585.6450@quantum>
Date: Fri, 10 Apr 2015 17:51:17 -0700
From: Michael Turquette <mturquette@...aro.org>
To: Jyri Sarha <jsarha@...com>, "Martin Fuzzey" <mfuzzey@...keon.com>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: clk-gpio-gate: Fix active low
Quoting Jyri Sarha (2015-03-18 07:52:14)
> On 03/18/15 15:53, Martin Fuzzey wrote:
> > The active low flag in the DT cell is currently ignored.
> >
> > This occurs because of_get_named_gpio_flags() does not apply the flags
> > to the underlying struct gpio_desc so the test in clk_register_gpio_gate()
> > was bogus.
> >
> > Note that this patch changes the internal kernel API for
> > clk_register_gpio_gate() but there are currently no other users.
> >
> > Signed-off-by: Martin Fuzzey <mfuzzey@...keon.com>
>
> Acked-by: Jyri Sarha <jsarha@...com>
Applied to clk-next.
Thanks,
Mike
>
> > ---
> > drivers/clk/clk-gpio-gate.c | 31 +++++++++++++++++--------------
> > include/linux/clk-provider.h | 2 +-
> > 2 files changed, 18 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/clk/clk-gpio-gate.c b/drivers/clk/clk-gpio-gate.c
> > index 08e4322..a71cabe 100644
> > --- a/drivers/clk/clk-gpio-gate.c
> > +++ b/drivers/clk/clk-gpio-gate.c
> > @@ -65,10 +65,12 @@ EXPORT_SYMBOL_GPL(clk_gpio_gate_ops);
> > * @dev: device that is registering this clock
> > * @name: name of this clock
> > * @parent_name: name of this clock's parent
> > - * @gpiod: gpio descriptor to gate this clock
> > + * @gpio: gpio number to gate this clock
> > + * @active_low: true if gpio should be set to 0 to enable clock
> > + * @flags: clock flags
> > */
> > struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
> > - const char *parent_name, struct gpio_desc *gpiod,
> > + const char *parent_name, unsigned gpio, bool active_low,
> > unsigned long flags)
> > {
> > struct clk_gpio *clk_gpio = NULL;
> > @@ -77,20 +79,19 @@ struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
> > unsigned long gpio_flags;
> > int err;
> >
> > - if (gpiod_is_active_low(gpiod))
> > - gpio_flags = GPIOF_OUT_INIT_HIGH;
> > + if (active_low)
> > + gpio_flags = GPIOF_ACTIVE_LOW | GPIOF_OUT_INIT_HIGH;
> > else
> > gpio_flags = GPIOF_OUT_INIT_LOW;
> >
> > if (dev)
> > - err = devm_gpio_request_one(dev, desc_to_gpio(gpiod),
> > - gpio_flags, name);
> > + err = devm_gpio_request_one(dev, gpio, gpio_flags, name);
> > else
> > - err = gpio_request_one(desc_to_gpio(gpiod), gpio_flags, name);
> > + err = gpio_request_one(gpio, gpio_flags, name);
> >
> > if (err) {
> > pr_err("%s: %s: Error requesting clock control gpio %u\n",
> > - __func__, name, desc_to_gpio(gpiod));
> > + __func__, name, gpio);
> > return ERR_PTR(err);
> > }
> >
> > @@ -111,7 +112,7 @@ struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
> > init.parent_names = (parent_name ? &parent_name : NULL);
> > init.num_parents = (parent_name ? 1 : 0);
> >
> > - clk_gpio->gpiod = gpiod;
> > + clk_gpio->gpiod = gpio_to_desc(gpio);
> > clk_gpio->hw.init = &init;
> >
> > clk = clk_register(dev, &clk_gpio->hw);
> > @@ -123,7 +124,8 @@ struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
> > kfree(clk_gpio);
> >
> > clk_register_gpio_gate_err:
> > - gpiod_put(gpiod);
> > + if (!dev)
> > + gpio_free(gpio);
> >
> > return clk;
> > }
> > @@ -149,8 +151,8 @@ static struct clk *of_clk_gpio_gate_delayed_register_get(
> > struct clk *clk;
> > const char *clk_name = data->node->name;
> > const char *parent_name;
> > - struct gpio_desc *gpiod;
> > int gpio;
> > + enum of_gpio_flags of_flags;
> >
> > mutex_lock(&data->lock);
> >
> > @@ -159,7 +161,8 @@ static struct clk *of_clk_gpio_gate_delayed_register_get(
> > return data->clk;
> > }
> >
> > - gpio = of_get_named_gpio_flags(data->node, "enable-gpios", 0, NULL);
> > + gpio = of_get_named_gpio_flags(data->node, "enable-gpios", 0,
> > + &of_flags);
> > if (gpio < 0) {
> > mutex_unlock(&data->lock);
> > if (gpio != -EPROBE_DEFER)
> > @@ -167,11 +170,11 @@ static struct clk *of_clk_gpio_gate_delayed_register_get(
> > __func__, clk_name);
> > return ERR_PTR(gpio);
> > }
> > - gpiod = gpio_to_desc(gpio);
> >
> > parent_name = of_clk_get_parent_name(data->node, 0);
> >
> > - clk = clk_register_gpio_gate(NULL, clk_name, parent_name, gpiod, 0);
> > + clk = clk_register_gpio_gate(NULL, clk_name, parent_name, gpio,
> > + of_flags & OF_GPIO_ACTIVE_LOW, 0);
> > if (IS_ERR(clk)) {
> > mutex_unlock(&data->lock);
> > return clk;
> > diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> > index d936409..6f514d5 100644
> > --- a/include/linux/clk-provider.h
> > +++ b/include/linux/clk-provider.h
> > @@ -515,7 +515,7 @@ struct clk_gpio {
> >
> > extern const struct clk_ops clk_gpio_gate_ops;
> > struct clk *clk_register_gpio_gate(struct device *dev, const char *name,
> > - const char *parent_name, struct gpio_desc *gpio,
> > + const char *parent_name, unsigned gpio, bool active_low,
> > unsigned long flags);
> >
> > void of_gpio_clk_gate_setup(struct device_node *node);
> >
>
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