linux-kernel - Re: [PATCH 2/3] soc: c3: Add support for power domains controller

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Message-ID: <e85f6dee-d62c-9f2f-b1de-8c38bb5aeb14@linaro.org>
Date:   Mon, 3 Jul 2023 15:29:31 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     =Xianwei Zhao <xianwei.zhao@...ogic.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH 2/3] soc: c3: Add support for power domains controller

Hi,

On 03/07/2023 11:31, =Xianwei Zhao wrote:
> From: Xianwei Zhao <xianwei.zhao@...ogic.com>
> 
> Add support for C3 Power controller. C3 power control
> registers are in secure domain, and should be accessed by SMC.
> 
> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
> ---
>   drivers/soc/amlogic/meson-secure-pwrc.c | 28 ++++++++++++++++++++++++-
>   1 file changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/amlogic/meson-secure-pwrc.c b/drivers/soc/amlogic/meson-secure-pwrc.c
> index 25b4b71df9b8..39ccc8f2e630 100644
> --- a/drivers/soc/amlogic/meson-secure-pwrc.c
> +++ b/drivers/soc/amlogic/meson-secure-pwrc.c
> @@ -12,6 +12,7 @@
>   #include <linux/pm_domain.h>
>   #include <dt-bindings/power/meson-a1-power.h>
>   #include <dt-bindings/power/meson-s4-power.h>
> +#include <dt-bindings/power/amlogic-c3-power.h>
>   #include <linux/arm-smccc.h>
>   #include <linux/firmware/meson/meson_sm.h>
>   #include <linux/module.h>
> @@ -132,6 +133,22 @@ static struct meson_secure_pwrc_domain_desc s4_pwrc_domains[] = {
>   	SEC_PD(S4_AUDIO,	0),
>   };
>   
> +static struct meson_secure_pwrc_domain_desc c3_pwrc_domains[] = {
> +	SEC_PD(C3_NNA,	0),
> +	SEC_PD(C3_AUDIO,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_SDIOA,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_EMMC,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_USB_COMB, GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_SDCARD,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_ETH,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_GE2D,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_CVE,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_GDC_WRAP,	GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_ISP_TOP,		GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_MIPI_ISP_WRAP, GENPD_FLAG_ALWAYS_ON),
> +	SEC_PD(C3_VCODEC,	0),
> +};

Please move this struct before _s4_

> +
>   static int meson_secure_pwrc_probe(struct platform_device *pdev)
>   {
>   	int i;
> @@ -179,7 +196,7 @@ static int meson_secure_pwrc_probe(struct platform_device *pdev)
>   	for (i = 0 ; i < match->count ; ++i) {
>   		struct meson_secure_pwrc_domain *dom = &pwrc->domains[i];
>   
> -		if (!match->domains[i].index)
> +		if (!match->domains[i].name)

Is this change necessary ? If yes please move it to another patch
and explain it's purpose. If it fixes something, add a Fixes tag so
it can be backported.

Thanks,
Neil

>   			continue;
>   
>   		dom->pwrc = pwrc;
> @@ -207,6 +224,11 @@ static struct meson_secure_pwrc_domain_data meson_secure_s4_pwrc_data = {
>   	.count = ARRAY_SIZE(s4_pwrc_domains),
>   };
>   
> +static struct meson_secure_pwrc_domain_data amlogic_secure_c3_pwrc_data = {
> +	.domains = c3_pwrc_domains,
> +	.count = ARRAY_SIZE(c3_pwrc_domains),
> +};

Please move this struct before _s4_

> +
>   static const struct of_device_id meson_secure_pwrc_match_table[] = {
>   	{
>   		.compatible = "amlogic,meson-a1-pwrc",
> @@ -216,6 +238,10 @@ static const struct of_device_id meson_secure_pwrc_match_table[] = {
>   		.compatible = "amlogic,meson-s4-pwrc",
>   		.data = &meson_secure_s4_pwrc_data,
>   	},
> +	{
> +		.compatible = "amlogic,c3-pwrc",
> +		.data = &amlogic_secure_c3_pwrc_data,
> +	},

Please move this entry before _s4_

>   	{ /* sentinel */ }
>   };
>   MODULE_DEVICE_TABLE(of, meson_secure_pwrc_match_table);

Thanks,
Neil