From: Kishon Vijay Abraham I <kishon@ti.com>
To: Thierry Reding <thierry.reding@gmail.com>, jckuo <jckuo@nvidia.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>,
<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/5] phy: tegra: xusb: Add support for power supplies
Date: Tue, 5 Feb 2019 18:25:04 +0530 [thread overview]
Message-ID: <7838bb0d-af30-e2dc-8bfd-e1256590f9d3@ti.com> (raw)
In-Reply-To: <20190128080054.GB18124@ulmo>
Hi,
On 28/01/19 1:30 PM, Thierry Reding wrote:
> On Mon, Jan 28, 2019 at 03:22:09PM +0800, jckuo wrote:
>> Hi Thierry,
>>
>> I think any non-zero return value of
>> regulator_bulk_enable()/devm_regulator_bulk_get() means error.
>>
>> Thanks,
>>
>> JC
>
> Theoretically I think only regulator_bulk_enable() could return a
> positive value, but even so it never will in practice because all of the
> regulator_enable() (see _regulator_enable()) calls will only ever return
> negative error codes.
>
> I can change this and resend if you have strong concerns about this
> possibly missing legitimate error cases.
All error codes are negative, so this is fine IMO.
Thanks
Kishon
>
> Thierry
>
>> On 1/25/19 7:25 PM, Thierry Reding wrote:
>>> From: Thierry Reding <treding@nvidia.com>
>>>
>>> Support enabling various supplies needed to provide power to the PLLs
>>> and logic used to drive the USB, PCI and SATA pads.
>>>
>>> Signed-off-by: Thierry Reding <treding@nvidia.com>
>>> ---
>>> drivers/phy/tegra/xusb.c | 34 +++++++++++++++++++++++++++++++++-
>>> drivers/phy/tegra/xusb.h | 5 +++++
>>> 2 files changed, 38 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
>>> index 57a2d08ef6da..e510629f4f1c 100644
>>> --- a/drivers/phy/tegra/xusb.c
>>> +++ b/drivers/phy/tegra/xusb.c
>>> @@ -864,6 +864,7 @@ static int tegra_xusb_padctl_probe(struct platform_device *pdev)
>>> struct tegra_xusb_padctl *padctl;
>>> const struct of_device_id *match;
>>> struct resource *res;
>>> + unsigned int i;
>>> int err;
>>> /* for backwards compatibility with old device trees */
>>> @@ -901,14 +902,38 @@ static int tegra_xusb_padctl_probe(struct platform_device *pdev)
>>> goto remove;
>>> }
>>> + padctl->supplies = devm_kcalloc(&pdev->dev, padctl->soc->num_supplies,
>>> + sizeof(*padctl->supplies), GFP_KERNEL);
>>> + if (!padctl->supplies) {
>>> + err = -ENOMEM;
>>> + goto remove;
>>> + }
>>> +
>>> + for (i = 0; i < padctl->soc->num_supplies; i++)
>>> + padctl->supplies[i].supply = padctl->soc->supply_names[i];
>>> +
>>> + err = devm_regulator_bulk_get(&pdev->dev, padctl->soc->num_supplies,
>>> + padctl->supplies);
>>> + if (err < 0) {
>>> + dev_err(&pdev->dev, "failed to get regulators: %d\n", err);
>>> + goto remove;
>>> + }
>>> +
>>> err = reset_control_deassert(padctl->rst);
>>> if (err < 0)
>>> goto remove;
>>> + err = regulator_bulk_enable(padctl->soc->num_supplies,
>>> + padctl->supplies);
>>> + if (err < 0) {
>>> + dev_err(&pdev->dev, "failed to enable supplies: %d\n", err);
>>> + goto reset;
>>> + }
>>> +
>>> err = tegra_xusb_setup_pads(padctl);
>>> if (err < 0) {
>>> dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
>>> - goto reset;
>>> + goto power_down;
>>> }
>>> err = tegra_xusb_setup_ports(padctl);
>>> @@ -921,6 +946,8 @@ static int tegra_xusb_padctl_probe(struct platform_device *pdev)
>>> remove_pads:
>>> tegra_xusb_remove_pads(padctl);
>>> +power_down:
>>> + regulator_bulk_disable(padctl->soc->num_supplies, padctl->supplies);
>>> reset:
>>> reset_control_assert(padctl->rst);
>>> remove:
>>> @@ -936,6 +963,11 @@ static int tegra_xusb_padctl_remove(struct platform_device *pdev)
>>> tegra_xusb_remove_ports(padctl);
>>> tegra_xusb_remove_pads(padctl);
>>> + err = regulator_bulk_disable(padctl->soc->num_supplies,
>>> + padctl->supplies);
>>> + if (err < 0)
>>> + dev_err(&pdev->dev, "failed to disable supplies: %d\n", err);
>>> +
>>> err = reset_control_assert(padctl->rst);
>>> if (err < 0)
>>> dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
>>> diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
>>> index bb60fc09c752..5d5d22f6cb41 100644
>>> --- a/drivers/phy/tegra/xusb.h
>>> +++ b/drivers/phy/tegra/xusb.h
>>> @@ -370,6 +370,9 @@ struct tegra_xusb_padctl_soc {
>>> } ports;
>>> const struct tegra_xusb_padctl_ops *ops;
>>> +
>>> + const char * const *supply_names;
>>> + unsigned int num_supplies;
>>> };
>>> struct tegra_xusb_padctl {
>>> @@ -393,6 +396,8 @@ struct tegra_xusb_padctl {
>>> unsigned int enable;
>>> struct clk *clk;
>>> +
>>> + struct regulator_bulk_data *supplies;
>>> };
>>> static inline void padctl_writel(struct tegra_xusb_padctl *padctl, u32 value,
next prev parent reply other threads:[~2019-02-05 12:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 11:25 [PATCH 1/5] dt-bindings: phy: tegra: Add Tegra186 support Thierry Reding
2019-01-25 11:25 ` [PATCH 2/5] phy: tegra: xusb: Skip single function lane programming Thierry Reding
2019-01-28 7:06 ` jckuo
2019-01-25 11:25 ` [PATCH 3/5] phy: tegra: xusb: Parse dual-role mode property Thierry Reding
2019-01-28 7:08 ` jckuo
2019-01-25 11:25 ` [PATCH 4/5] phy: tegra: xusb: Add support for power supplies Thierry Reding
2019-01-28 7:22 ` jckuo
2019-01-28 8:00 ` Thierry Reding
2019-01-29 6:50 ` jckuo
2019-02-05 12:55 ` Kishon Vijay Abraham I [this message]
2019-02-07 11:11 ` Thierry Reding
2019-01-25 11:25 ` [PATCH 5/5] phy: tegra: xusb: Add Tegra186 support Thierry Reding
2019-01-28 7:45 ` jckuo
2019-02-07 11:47 ` Kishon Vijay Abraham I
2019-02-07 12:17 ` Thierry Reding
2019-01-28 7:04 ` [PATCH 1/5] dt-bindings: phy: tegra: " jckuo
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