From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christian Lamparter Subject: Re: [PATCH 4/5] pinctrl: actions: Add gpio support for Actions S900 SoC Date: Sat, 19 May 2018 11:18:53 +0200 Message-ID: <12834501.5lBvNSZm06@debian64> References: <20180518023056.7869-1-manivannan.sadhasivam@linaro.org> <20180518023056.7869-5-manivannan.sadhasivam@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <20180518023056.7869-5-manivannan.sadhasivam@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: Manivannan Sadhasivam Cc: linus.walleij@linaro.org, robh+dt@kernel.org, afaerber@suse.de, liuwei@actions-semi.com, mp-cs@actions-semi.com, 96boards@ucrobotics.com, devicetree@vger.kernel.org, andy.shevchenko@gmail.com, daniel.thompson@linaro.org, amit.kucheria@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, hzhang@ucrobotics.com, bdong@ucrobotics.com, manivannanece23@gmail.com List-Id: linux-gpio@vger.kernel.org On Friday, May 18, 2018 4:30:55 AM CEST Manivannan Sadhasivam wrote: > Add gpio support to pinctrl driver for Actions Semi S900 SoC. > > Signed-off-by: Manivannan Sadhasivam > --- > [...] > +static int owl_gpio_init(struct owl_pinctrl *pctrl) > +{ > + struct gpio_chip *chip; > + int ret; > + > + chip = &pctrl->chip; > + chip->base = -1; > + chip->ngpio = pctrl->soc->ngpios; > + chip->label = dev_name(pctrl->dev); > + chip->parent = pctrl->dev; > + chip->owner = THIS_MODULE; > + chip->of_node = pctrl->dev->of_node; > + > + ret = gpiochip_add_data(&pctrl->chip, pctrl); > + if (ret) { > + dev_err(pctrl->dev, "failed to register gpiochip\n"); > + return ret; > + } > + > + ret = gpiochip_add_pin_range(&pctrl->chip, dev_name(pctrl->dev), > + 0, 0, chip->ngpio); > + if (ret) { > + dev_err(pctrl->dev, "failed to add pin range\n"); > + gpiochip_remove(&pctrl->chip); > + return ret; > + } > + gpiochip_add_pin_range()? That's not going to work with gpio-hogs. But, you can easily test this. Just add a gpio-hog [0] ( Section 2. gpio-controller nodes) into the Devicetree's pinctrl node. something like: (No idea if GPIO1 is already used, but any free gpio will do) | [...] | pinctrl@e01b0000 { | compatible = "actions,s900-pinctrl"; | reg = <0x0 0xe01b0000 0x0 0x1000>; | clocks = <&cmu CLK_GPIO>; | gpio-controller; | #gpio-cells = <2>; | | line_b { | gpio-hog; | gpios = <1 GPIO_ACTIVE_HIGH>; | output-low; | line-name = "foo-bar-gpio"; | }; | }; The pinctrl probe will fail. You can fix this by replacing the gpiochip_add_pin_range() and use the gpio-ranges [0] property to define the range. [0]