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SubjectRe: [PATCH 4/5] phy: tegra: xusb: Add support for power supplies
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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,

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