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Message-ID: <20181218115056.GO20658@localhost>
Date: Tue, 18 Dec 2018 12:50:56 +0100
From: Johan Hovold <johan@...nel.org>
To: Nishad Kamdar <nishadkamdar@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
Rui Miguel Silva <rmfrfs@...il.com>,
greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] staging: greybus: arche-platform: Switch to the
gpio descriptor interface
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@...il.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
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