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SubjectRe: [PATCH 2/3] soc: mediatek: pm-domains: Add domain regulator supply
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Hi Hsin-Yi,

Thank you for the patch.

On 10/1/21 2:49, Nicolas Boichat wrote:
> On Thu, Jan 7, 2021 at 6:49 PM Hsin-Yi Wang <hsinyi@chromium.org> wrote:
>>
>> Some power domains (eg. mfg) needs to turn on power supply before power
>> on.
>>
>> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
>
> Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
>

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>


>> ---
>> drivers/soc/mediatek/mt8183-pm-domains.h | 1 +
>> drivers/soc/mediatek/mtk-pm-domains.c | 36 +++++++++++++++++++++++-
>> drivers/soc/mediatek/mtk-pm-domains.h | 1 +
>> 3 files changed, 37 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/soc/mediatek/mt8183-pm-domains.h b/drivers/soc/mediatek/mt8183-pm-domains.h
>> index 8d996c5d2682d..aa5230e6c12f8 100644
>> --- a/drivers/soc/mediatek/mt8183-pm-domains.h
>> +++ b/drivers/soc/mediatek/mt8183-pm-domains.h
>> @@ -38,6 +38,7 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8183[] = {
>> .ctl_offs = 0x0338,
>> .sram_pdn_bits = GENMASK(8, 8),
>> .sram_pdn_ack_bits = GENMASK(12, 12),
>> + .caps = MTK_SCPD_DOMAIN_SUPPLY,
>> },
>> [MT8183_POWER_DOMAIN_MFG_CORE0] = {
>> .sta_mask = BIT(7),
>> diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
>> index fb70cb3b07b36..ae255aa7b1a97 100644
>> --- a/drivers/soc/mediatek/mtk-pm-domains.c
>> +++ b/drivers/soc/mediatek/mtk-pm-domains.c
> [snip]
>> @@ -275,6 +295,7 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>> {
>> const struct scpsys_domain_data *domain_data;
>> struct scpsys_domain *pd;
>> + struct device_node *np = scpsys->dev->of_node;
>> struct property *prop;
>> const char *clk_name;
>> int i, ret, num_clks;
>> @@ -307,6 +328,19 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
>> pd->data = domain_data;
>> pd->scpsys = scpsys;
>>
>> + if (MTK_SCPD_CAPS(pd, MTK_SCPD_DOMAIN_SUPPLY)) {
>> + /* Find regulator in current power domain node */
>> + scpsys->dev->of_node = node;
>> + pd->supply = devm_regulator_get(scpsys->dev, "domain");
>> + scpsys->dev->of_node = np;
>
> This pattern is a bit strange to me. But Hsin-Yi pointed out that
> there are precedents:
> https://elixir.bootlin.com/linux/v5.11-rc2/source/drivers/iio/adc/rcar-gyroadc.c#L397
> .

nit: Strange to me too. Maybe it needs a better comment/explanation and/or use
child/parent as a temporal of_node names to make a bit more readable. Looks like
[devm_]regulator_get only accepts a device as argument and will look into child
nodes.


>
>> + if (IS_ERR(pd->supply)) {
>> + dev_err_probe(scpsys->dev, PTR_ERR(pd->supply),
>> + "%pOF: failed to get power supply.\n",
>> + node);
>> + return ERR_CAST(pd->supply);
>> + }
>> + }
>> +
>> pd->infracfg = syscon_regmap_lookup_by_phandle_optional(node, "mediatek,infracfg");
>> if (IS_ERR(pd->infracfg))
>> return ERR_CAST(pd->infracfg);
>> diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
>> index a2f4d8f97e058..b2770b5266dba 100644
>> --- a/drivers/soc/mediatek/mtk-pm-domains.h
>> +++ b/drivers/soc/mediatek/mtk-pm-domains.h
>> @@ -7,6 +7,7 @@
>> #define MTK_SCPD_FWAIT_SRAM BIT(1)
>> #define MTK_SCPD_SRAM_ISO BIT(2)
>> #define MTK_SCPD_KEEP_DEFAULT_OFF BIT(3)
>> +#define MTK_SCPD_DOMAIN_SUPPLY BIT(4)
>> #define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x))
>>
>> #define SPM_VDE_PWR_CON 0x0210
>> --
>> 2.29.2.729.g45daf8777d-goog
>>
>>
>> _______________________________________________
>> Linux-mediatek mailing list
>> Linux-mediatek@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-mediatek

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