linux-kernel - Re: [PATCH v5 2/3] staging: greybus: arche-apb-ctrl.c: Switch to the gpio descriptor interface

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Sun, 13 Jan 2019 18:24:25 +0530
From:   Nishad Kamdar <nishadkamdar@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.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 v5 2/3] staging: greybus: arche-apb-ctrl.c: Switch to the
 gpio descriptor interface

On Fri, Jan 11, 2019 at 09:41:34AM +0100, Johan Hovold wrote:
> On Thu, Jan 10, 2019 at 11:21:04PM +0530, Nishad Kamdar wrote:
> > Use the gpiod interface instead of the deprecated old non-descriptor
> > interface while continuing to ignore gpio flags from device tree in
> > functions "deassert_reset()" and "assert_reset()" for now.
> > 
> > Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> > ---
> > Changes in v5:
> >  - Change the commit message.
> >  - Restore the names of the gpio device-tree properties without
> >    the "-gpio" suffix.
> > Changes in v4:
> >  - Use gpiod_set_raw_value() for deassert_reset() and
> >    assert_reset() as gpiod_set_value() will change the
> >    sematics of these calls by taking any gpio flags
> >    into account.
> >  - Remove some unnecesssary line breaks.
> >  - Restore 'spi_en' gpio check in fw_flashing_seq()
> >    as it is currently optional.
> > Changes in v3:
> >  - Add this patch in a patchset.
> > Changes in v2:
> >  - Resolved compilation errors.
> > ---
> 
> Also looks good now. You can add my
> 
> Reviewed-by: Johan Hovold <johan@...nel.org>
> 
> Found one really minor nit below, which doesn't really need to be fixed,
> but since you may need to update the third patch, you might as well
> consider this too.
> 
Ok, I'll do that.
> >  	/* It's not mandatory to support power management interface */
> > -	apb->pwroff_gpio = of_get_named_gpio(np, "pwr-off-gpios", 0);
> > -	if (apb->pwroff_gpio < 0) {
> > -		dev_err(dev, "failed to get power off gpio\n");
> > -		return apb->pwroff_gpio;
> > -	}
> > -	ret = devm_gpio_request_one(dev, apb->pwroff_gpio,
> > -				    GPIOF_IN, "pwroff_n");
> > -	if (ret) {
> > -		dev_err(dev, "Failed requesting pwroff_n gpio %d\n",
> > -			apb->pwroff_gpio);
> > +	apb->pwroff = devm_gpiod_get_optional(dev, "pwr-off",
> > +					      GPIOD_IN);
> 
> Looks like you don't need to break the above statement any more either.
> 
> > +	if (IS_ERR(apb->pwroff)) {
> > +		ret = PTR_ERR(apb->pwroff);
> > +		dev_err(dev, "Failed requesting pwroff_n GPIO: %d\n", ret);
> >  		return ret;
> >  	}
> >  
> >  	/* Do not make clock mandatory as of now (for DB3) */
> > -	apb->clk_en_gpio = of_get_named_gpio(np, "clock-en-gpio", 0);
> > -	if (apb->clk_en_gpio < 0) {
> > -		dev_warn(dev, "failed to get clock en gpio\n");
> > -	} else if (gpio_is_valid(apb->clk_en_gpio)) {
> > -		ret = devm_gpio_request_one(dev, apb->clk_en_gpio,
> > -					    GPIOF_OUT_INIT_LOW, "apb_clk_en");
> > -		if (ret) {
> > -			dev_warn(dev, "Failed requesting APB clock en gpio %d\n",
> > -				 apb->clk_en_gpio);
> > -			return ret;
> > -		}
> > +	apb->clk_en = devm_gpiod_get_optional(dev, "clock-en",
> > +					      GPIOD_OUT_LOW);
> 
> Same here?
> 
Ok, I'll do that.

Thanks and regards,
Nishad
> > +	if (IS_ERR(apb->clk_en)) {
> > +		ret = PTR_ERR(apb->clk_en);
> > +		dev_err(dev, "Failed requesting APB clock en GPIO: %d\n", ret);
> > +		return ret;
> >  	}
> 
> Johan