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Date:   Tue, 18 Dec 2018 12:50:56 +0100
From:   Johan Hovold <johan@kernel.org>
To:     Nishad Kamdar <nishadkamdar@gmail.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Johan Hovold <johan@kernel.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
Subject: Re: [PATCH v3 3/3] staging: greybus: arche-platform: Switch to the
 gpio descriptor interface
Message-ID: <20181218115056.GO20658@localhost>
References: <cover.1542898267.git.nishadkamdar@gmail.com>
 <2200db633d8e723b881ef355527afaef0d5ccf24.1542898267.git.nishadkamdar@gmail.com>
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In-Reply-To: <2200db633d8e723b881ef355527afaef0d5ccf24.1542898267.git.nishadkamdar@gmail.com>
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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).

>  	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.

>  			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.

>  			!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.

> -	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