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Date:   Sat, 22 Dec 2018 20:12:52 +0530
From:   Nishad Kamdar <nishadkamdar@gmail.com>
To:     Johan Hovold <johan@kernel.org>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Alex Elder <elder@kernel.org>,
        Rui Miguel Silva <rmfrfs@gmail.com>,
        greybus-dev@lists.linaro.org, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org,
        Nishad Kamdar <nishadkamdar@gmail.com>
Subject: Re: [PATCH v3 3/3] staging: greybus: arche-platform: Switch to the
 gpio descriptor interface
Message-ID: <20181222144251.GC15439@nishad>
References: <cover.1542898267.git.nishadkamdar@gmail.com>
 <2200db633d8e723b881ef355527afaef0d5ccf24.1542898267.git.nishadkamdar@gmail.com>
 <20181218115056.GO20658@localhost>
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On Tue, Dec 18, 2018 at 12:50:56PM +0100, Johan Hovold wrote:
> On Thu, Nov 22, 2018 at 10:39:24PM +0530, Nishad Kamdar wrote:
> > Use the gpiod interface instead of the deprecated
> > old non-descriptor interface.
> > 
> > Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
> > ---
> > Changes in v2:
> >  - Move comment to the same line as to what it applies to.
> > ---
> >  drivers/staging/greybus/arche-platform.c | 119 ++++++++---------------
> >  1 file changed, 41 insertions(+), 78 deletions(-)
> > 
> > diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
> > index 4c36e88766e7..a5cea79d8e32 100644
> > --- a/drivers/staging/greybus/arche-platform.c
> > +++ b/drivers/staging/greybus/arche-platform.c
> > @@ -8,10 +8,9 @@
> >  
> >  #include <linux/clk.h>
> >  #include <linux/delay.h>
> > -#include <linux/gpio.h>
> > +#include <linux/gpio/consumer.h>
> >  #include <linux/init.h>
> >  #include <linux/module.h>
> > -#include <linux/of_gpio.h>
> >  #include <linux/of_platform.h>
> >  #include <linux/pinctrl/consumer.h>
> >  #include <linux/platform_device.h>
> > @@ -45,14 +44,14 @@ enum svc_wakedetect_state {
> >  
> >  struct arche_platform_drvdata {
> >  	/* Control GPIO signals to and from AP <=> SVC */
> > -	int svc_reset_gpio;
> > +	struct gpio_desc *svc_reset;
> > +	struct gpio_desc *svc_sysboot;
> 
> Why move sysboot? The flag below is about reset (but should eventually
> go away).
> 
Ok, I'll restore its position.

> >  	bool is_reset_act_hi;
> > -	int svc_sysboot_gpio;
> > -	int wake_detect_gpio; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
> > +	struct gpio_desc *wake_detect; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
> >  
> >  	enum arche_platform_state state;
> >  
> > -	int svc_refclk_req;
> > +	struct gpio_desc *svc_refclk_req;
> >  	struct clk *svc_ref_clk;
> >  
> >  	struct pinctrl *pinctrl;
> > @@ -85,9 +84,9 @@ static void arche_platform_set_wake_detect_state(
> >  	arche_pdata->wake_detect_state = state;
> >  }
> >  
> > -static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
> > +static inline void svc_reset_onoff(struct gpio_desc *gpio, bool onoff)
> >  {
> > -	gpio_set_value(gpio, onoff);
> > +	gpiod_set_value(gpio, onoff);
> >  }
> >  
> >  static int apb_cold_boot(struct device *dev, void *data)
> > @@ -116,7 +115,6 @@ static int apb_poweroff(struct device *dev, void *data)
> >  static void arche_platform_wd_irq_en(struct arche_platform_drvdata *arche_pdata)
> >  {
> >  	/* Enable interrupt here, to read event back from SVC */
> > -	gpio_direction_input(arche_pdata->wake_detect_gpio);
> >  	enable_irq(arche_pdata->wake_detect_irq);
> >  }
> >  
> > @@ -160,7 +158,7 @@ static irqreturn_t arche_platform_wd_irq(int irq, void *devid)
> >  
> >  	spin_lock_irqsave(&arche_pdata->wake_lock, flags);
> >  
> > -	if (gpio_get_value(arche_pdata->wake_detect_gpio)) {
> > +	if (gpiod_get_value(arche_pdata->wake_detect)) {
> >  		/* wake/detect rising */
> >  
> >  		/*
> > @@ -224,10 +222,10 @@ arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
> >  
> >  	dev_info(arche_pdata->dev, "Booting from cold boot state\n");
> >  
> > -	svc_reset_onoff(arche_pdata->svc_reset_gpio,
> > +	svc_reset_onoff(arche_pdata->svc_reset,
> 
> No need to break line here.
> 
Ok.

> >  			arche_pdata->is_reset_act_hi);
> >  
> > -	gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);
> > +	gpiod_set_value(arche_pdata->svc_sysboot, 0);
> >  	usleep_range(100, 200);
> >  
> >  	ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
> > @@ -238,7 +236,7 @@ arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
> >  	}
> >  
> >  	/* bring SVC out of reset */
> > -	svc_reset_onoff(arche_pdata->svc_reset_gpio,
> > +	svc_reset_onoff(arche_pdata->svc_reset,
> 
> Same here. Please check throughout.
> 
Yes.

> >  			!arche_pdata->is_reset_act_hi);
> >  
> >  	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_ACTIVE);
> > @@ -259,10 +257,10 @@ arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
> >  
> >  	dev_info(arche_pdata->dev, "Switching to FW flashing state\n");
> >  
> > -	svc_reset_onoff(arche_pdata->svc_reset_gpio,
> > +	svc_reset_onoff(arche_pdata->svc_reset,
> >  			arche_pdata->is_reset_act_hi);
> >  
> > -	gpio_set_value(arche_pdata->svc_sysboot_gpio, 1);
> > +	gpiod_set_value(arche_pdata->svc_sysboot, 1);
> >  
> >  	usleep_range(100, 200);
> >  
> > @@ -273,7 +271,7 @@ arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
> >  		return ret;
> >  	}
> >  
> > -	svc_reset_onoff(arche_pdata->svc_reset_gpio,
> > +	svc_reset_onoff(arche_pdata->svc_reset,
> >  			!arche_pdata->is_reset_act_hi);
> >  
> >  	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_FW_FLASHING);
> > @@ -305,7 +303,7 @@ arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pdata)
> >  	clk_disable_unprepare(arche_pdata->svc_ref_clk);
> >  
> >  	/* As part of exit, put APB back in reset state */
> > -	svc_reset_onoff(arche_pdata->svc_reset_gpio,
> > +	svc_reset_onoff(arche_pdata->svc_reset,
> >  			arche_pdata->is_reset_act_hi);
> >  
> >  	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
> > @@ -435,6 +433,7 @@ static int arche_platform_probe(struct platform_device *pdev)
> >  	struct device *dev = &pdev->dev;
> >  	struct device_node *np = dev->of_node;
> >  	int ret;
> > +	unsigned int flags;
> >  
> >  	arche_pdata = devm_kzalloc(&pdev->dev, sizeof(*arche_pdata),
> >  				   GFP_KERNEL);
> > @@ -444,61 +443,33 @@ static int arche_platform_probe(struct platform_device *pdev)
> >  	/* setup svc reset gpio */
> >  	arche_pdata->is_reset_act_hi = of_property_read_bool(np,
> >  							     "svc,reset-active-high");
> 
> This should also go away eventually in favour of gpio flags in
> devicetree. Fine to keep for now, though.
>
Ok.

> > -	arche_pdata->svc_reset_gpio = of_get_named_gpio(np,
> > -							"svc,reset-gpio",
> > -							0);
> > -	if (!gpio_is_valid(arche_pdata->svc_reset_gpio)) {
> > -		dev_err(dev, "failed to get reset-gpio\n");
> > -		return arche_pdata->svc_reset_gpio;
> > -	}
> > -	ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
> > -	if (ret) {
> > -		dev_err(dev, "failed to request svc-reset gpio:%d\n", ret);
> > -		return ret;
> > -	}
> > -	ret = gpio_direction_output(arche_pdata->svc_reset_gpio,
> > -				    arche_pdata->is_reset_act_hi);
> > -	if (ret) {
> > -		dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
> > +	if (arche_pdata->is_reset_act_hi)
> > +		flags = GPIOD_OUT_HIGH;
> > +	else
> > +		flags = GPIOD_OUT_LOW;
> > +
> > +	arche_pdata->svc_reset = devm_gpiod_get(dev, "svc,reset-gpio", flags);
> > +	if (IS_ERR(arche_pdata->svc_reset)) {
> > +		ret = PTR_ERR(arche_pdata->svc_reset);
> > +		dev_err(dev, "failed to request svc-reset GPIO:%d\n", ret);
> >  		return ret;
> >  	}
> 
> Thanks,
> Johan

Thanks for the review.

Regards,
Nishad