Re: 回复: 回复: [EXT] [PATCH] power: regulator: scmi: Move regulator subnode hack to scmi_regulator

[Peng Fan <peng.fan@oss.nxp.com>]

On Fri, Apr 18, 2025 at 10:52:00AM +0800, Peng Fan wrote:
>On Wed, Apr 09, 2025 at 06:42:14AM +0000, Alice Guo (OSS) wrote:
>>> -----邮件原件-----
>>> 发件人: Marek Vasut <marex@denx.de>
>>> 发送时间: 2025年4月9日 2:31
>>> 收件人: Alice Guo (OSS) <alice.guo@oss.nxp.com>; u-boot@lists.denx.de
>>> 抄送: Alice Guo <alice.guo@nxp.com>; Ilias Apalodimas
>>> <ilias.apalodimas@linaro.org>; Jaehoon Chung <jh80.chung@samsung.com>;
>>> Tom Rini <trini@konsulko.com>
>>> 主题: Re: 回复: [EXT] [PATCH] power: regulator: scmi: Move regulator
>>> subnode hack to scmi_regulator
>>> 
>>> On 4/3/25 12:56 PM, Alice Guo (OSS) wrote:
>>> >> -----邮件原件-----
>>> >> 发件人: Marek Vasut <marex@denx.de>
>>> >> 发送时间: 2025年3月22日 9:45
>>> >> 收件人: u-boot@lists.denx.de
>>> >> 抄送: Marek Vasut <marex@denx.de>; Alice Guo <alice.guo@nxp.com>;
>>> Ilias
>>> >> Apalodimas <ilias.apalodimas@linaro.org>; Jaehoon Chung
>>> >> <jh80.chung@samsung.com>; Tom Rini <trini@konsulko.com>
>>> >> 主题: [EXT] [PATCH] power: regulator: scmi: Move regulator subnode hack
>>> >> to scmi_regulator
>>> >>
>>> >> Caution: This is an external email. Please take care when clicking
>>> >> links or opening attachments. When in doubt, report the message using
>>> >> the 'Report this email' button
>>> >>
>>> >>
>>> >> The current code attempts to bind scmi_voltage_domain to regulator
>>> >> subnode of the SCMI protocol node, so scmi_voltage_domain can then
>>> >> bind regulators directly to subnodes of its node. This kind of
>>> >> behavior should not be in core code, move it into scmi_voltage_domain
>>> >> driver code. Let the driver descend into regulator node and bind regulators to
>>> its subnodes.
>>> >>
>>> >> Fixes: 1f213ee4dbf2 ("firmware: scmi: voltage regulator")
>>> >> Signed-off-by: Marek Vasut <marex@denx.de>
>>> >> ---
>>> >> Cc: Alice Guo <alice.guo@nxp.com>
>>> >> Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
>>> >> Cc: Jaehoon Chung <jh80.chung@samsung.com>
>>> >> Cc: Tom Rini <trini@konsulko.com>
>>> >> Cc: u-boot@lists.denx.de
>>> >> ---
>>> >>   drivers/firmware/scmi/scmi_agent-uclass.c | 8 +-------
>>> >> drivers/power/regulator/scmi_regulator.c  | 6 ++++++
>>> >>   2 files changed, 7 insertions(+), 7 deletions(-)
>>> >>
>>> >> diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c
>>> >> b/drivers/firmware/scmi/scmi_agent-uclass.c
>>> >> index 8c907c3b032..e6e43ae936a 100644
>>> >> --- a/drivers/firmware/scmi/scmi_agent-uclass.c
>>> >> +++ b/drivers/firmware/scmi/scmi_agent-uclass.c
>>> >> @@ -427,14 +427,8 @@ static int scmi_bind_protocols(struct udevice *dev)
>>> >>                          break;
>>> >>                  case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
>>> >>                          if
>>> (IS_ENABLED(CONFIG_DM_REGULATOR_SCMI)
>>> >> &&
>>> >> -                           scmi_protocol_is_supported(dev,
>>> protocol_id))
>>> >> {
>>> >> -                               node = ofnode_find_subnode(node,
>>> >> "regulators");
>>> >> -                               if (!ofnode_valid(node)) {
>>> >> -                                       dev_err(dev, "no
>>> regulators
>>> >> node\n");
>>> >> -                                       return -ENXIO;
>>> >> -                               }
>>> >> +                           scmi_protocol_is_supported(dev,
>>> >> + protocol_id))
>>> >>                                  drv =
>>> >> DM_DRIVER_GET(scmi_voltage_domain);
>>> >> -                       }
>>> >>                          break;
>>> >>                  default:
>>> >>                          break;
>>> >> diff --git a/drivers/power/regulator/scmi_regulator.c
>>> >> b/drivers/power/regulator/scmi_regulator.c
>>> >> index 99f6506f162..2550b27246f 100644
>>> >> --- a/drivers/power/regulator/scmi_regulator.c
>>> >> +++ b/drivers/power/regulator/scmi_regulator.c
>>> >> @@ -178,6 +178,12 @@ static int scmi_regulator_bind(struct udevice *dev)
>>> >>          ofnode node;
>>> >>          int ret;
>>> >>
>>> >> +       node = ofnode_find_subnode(node, "regulators");
>>> >> +       if (!ofnode_valid(node)) {
>>> >> +               dev_err(dev, "no regulators node\n");
>>> >> +               return -ENXIO;
>>> >> +       }
>>> >> +
>>> >>          drv = DM_DRIVER_GET(scmi_regulator);
>>> >>
>>> >>          ofnode_for_each_subnode(node, dev_ofnode(dev)) {
>>> >> --
>>> >> 2.47.2
>>> >
>>> > Hi Marek,
>>> >
>>> > Is there a problem in your patch? Should it be changed like this:
>>> What kind of problem ? Can you please elaborate ?
>>
>>I think that in the scmi_regulator_bind() function, the second parameter passed into ofnode_for_each_subnode() should be the node named "regulators".
>>
>>static int scmi_regulator_bind(struct udevice *dev)
>>{
>>	struct driver *drv;
>>	ofnode regul_node;
>>	ofnode node;
>>	int ret;
>>
>>	regul_node = ofnode_find_subnode(dev_ofnode(dev), "regulators");
>
>Right. I could correct this when apply the patch.

>
>Thanks,
>Peng
>
>>	if (!ofnode_valid(regul_node)) {
>>		dev_err(dev, "no regulators node\n");

This patch has issue, it will always return failure here.

Regards,
Peng

>>		return -ENXIO;
>>	}
>>
>>	drv = DM_DRIVER_GET(scmi_regulator);
>>
>>	ofnode_for_each_subnode(node, regul_node) {
>>		ret = device_bind(dev, drv, ofnode_get_name(node),
>>				  NULL, node, NULL);
>>		if (ret)
>>			return ret;
>>	}
>>
>>	return 0;
>>}
>>
>>Best Regards,
>>Alice Guo
>>