From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: Dmitry Osipenko <digetx@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Peter Chen <Peter.Chen@nxp.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Felipe Balbi <balbi@kernel.org>,
devicetree@vger.kernel.org, linux-usb@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 10/16] usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state
Date: Fri, 3 Jan 2020 08:58:04 +0100 [thread overview]
Message-ID: <20200103075803.GC14228@qmqm.qmqm.pl> (raw)
In-Reply-To: <20191228203358.23490-11-digetx@gmail.com>
On Sat, Dec 28, 2019 at 11:33:52PM +0300, Dmitry Osipenko wrote:
[...]
> static int ulpi_open(struct tegra_usb_phy *phy)
> {
> - int err;
> -
> - err = gpio_direction_output(phy->reset_gpio, 0);
> - if (err) {
> - dev_err(phy->u_phy.dev,
> - "ULPI reset GPIO %d direction not deasserted: %d\n",
> - phy->reset_gpio, err);
> - return err;
> - }
> + gpiod_set_value_cansleep(phy->reset_gpio, 1);
>
> return 0;
> }
The message now removed seems inverted to the meaning of the code. Is
this a bug, or the reset really should be asserted here? I can see that
it is deasserted in phy_power_up, but that goes before or after ulpi_open()?
After the change below, the reset is asserted at probe() time now.
[...]
> - err = devm_gpio_request(&pdev->dev, tegra_phy->reset_gpio,
> - "ulpi_phy_reset_b");
> + gpiod = devm_gpiod_get_from_of_node(&pdev->dev, np,
> + "nvidia,phy-reset-gpio",
> + 0, GPIOD_OUT_HIGH,
> + "ulpi_phy_reset_b");
> + err = PTR_ERR_OR_ZERO(gpiod);
> if (err) {
> - dev_err(&pdev->dev, "Request failed for GPIO %d: %d\n",
> - tegra_phy->reset_gpio, err);
> + dev_err(&pdev->dev,
> + "Request failed for reset GPIO: %d\n", err);
> return err;
> }
> + tegra_phy->reset_gpio = gpiod;
A nice extension to kernel's printf - "%pe" format - has just landed in
Linus' master tree.
Best Regards,
Michał Mirosław
next prev parent reply other threads:[~2020-01-03 7:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-28 20:33 [PATCH v3 00/16] NVIDIA Tegra USB2 drivers clean up Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 01/16] dt-binding: usb: ci-hdrc-usb2: Document NVIDIA Tegra support Dmitry Osipenko
2020-01-04 0:33 ` Rob Herring
2020-01-04 2:04 ` Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 02/16] usb: phy: tegra: Hook up init/shutdown callbacks Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 03/16] usb: phy: tegra: Perform general clean up of the code Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 04/16] usb: phy: tegra: Use relaxed versions of readl/writel Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 05/16] usb: phy: tegra: Use generic stub for a missing VBUS regulator Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 06/16] usb: ulpi: Add resource-managed variant of otg_ulpi_create() Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 07/16] usb: phy: tegra: Use devm_otg_ulpi_create() Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 08/16] usb: phy: tegra: Use u32 for hardware register variables Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 09/16] usb: phy: tegra: Assert reset on ULPI close instead of deasserting it Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 10/16] usb: phy: tegra: Use device-tree notion of reset-GPIO's active-state Dmitry Osipenko
2020-01-03 7:58 ` Michał Mirosław [this message]
2020-01-03 23:53 ` Dmitry Osipenko
2020-01-05 0:58 ` Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 11/16] usb: phy: tegra: Disable VBUS regulator on tegra_usb_phy_init failure Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 12/16] usb: phy: tegra: Move utmip_pad_count checking under lock Dmitry Osipenko
2019-12-28 20:33 ` [PATCH v3 13/16] usb: phy: tegra: Keep CPU interrupts enabled Dmitry Osipenko
2019-12-30 20:36 ` Michał Mirosław
2020-01-02 14:40 ` Dmitry Osipenko
2020-01-03 7:41 ` Michał Mirosław
2019-12-28 20:33 ` [PATCH v3 14/16] usb: chipidea: tegra: Stop managing PHY's power Dmitry Osipenko
2019-12-30 2:24 ` Peter Chen
2019-12-28 20:33 ` [PATCH v3 15/16] usb: chipidea: tegra: Add USB_TEGRA_PHY to driver's dependencies Dmitry Osipenko
2019-12-30 2:25 ` Peter Chen
2019-12-28 20:33 ` [PATCH v3 16/16] usb: host: ehci-tegra: Remove unused fields from tegra_ehci_hcd Dmitry Osipenko
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