linux-kernel - Re: [PATCH v7 10/26] PM / devfreq: rockchip-dfi: Add RK3568 support

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Date:   Sat, 7 Oct 2023 03:17:14 +0900
From:   Chanwoo Choi <chanwoo@...nel.org>
To:     Sascha Hauer <s.hauer@...gutronix.de>,
        linux-rockchip@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Heiko Stuebner <heiko@...ech.de>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>, kernel@...gutronix.de,
        Michael Riesch <michael.riesch@...fvision.net>,
        Robin Murphy <robin.murphy@....com>,
        Vincent Legoll <vincent.legoll@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: Re: [PATCH v7 10/26] PM / devfreq: rockchip-dfi: Add RK3568 support

On 23. 7. 4. 18:32, Sascha Hauer wrote:
> This adds RK3568 support to the DFI driver.  Only iniitialization
> differs from the currently supported RK3399.
> 
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>  drivers/devfreq/event/rockchip-dfi.c | 21 +++++++++++++++++++++
>  include/soc/rockchip/rk3568_grf.h    | 12 ++++++++++++
>  2 files changed, 33 insertions(+)
>  create mode 100644 include/soc/rockchip/rk3568_grf.h
> 
> diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/rockchip-dfi.c
> index 6b3ef97b3be09..261d112580c9e 100644
> --- a/drivers/devfreq/event/rockchip-dfi.c
> +++ b/drivers/devfreq/event/rockchip-dfi.c
> @@ -23,6 +23,7 @@
>  
>  #include <soc/rockchip/rockchip_grf.h>
>  #include <soc/rockchip/rk3399_grf.h>
> +#include <soc/rockchip/rk3568_grf.h>
>  
>  #define DMC_MAX_CHANNELS	2
>  
> @@ -209,10 +210,30 @@ static int rk3399_dfi_init(struct rockchip_dfi *dfi)
>  	return 0;
>  };
>  
> +static int rk3568_dfi_init(struct rockchip_dfi *dfi)
> +{
> +	struct regmap *regmap_pmu = dfi->regmap_pmu;
> +	u32 reg2, reg3;
> +
> +	regmap_read(regmap_pmu, RK3568_PMUGRF_OS_REG2, &reg2);
> +	regmap_read(regmap_pmu, RK3568_PMUGRF_OS_REG3, &reg3);
> +
> +	dfi->ddr_type = FIELD_GET(RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO, reg2);
> +
> +	if (FIELD_GET(RK3568_PMUGRF_OS_REG3_SYSREG_VERSION, reg3) >= 0x3)
> +		dfi->ddr_type |= FIELD_GET(RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3, reg3) << 3;

There are no reason of why shifting the '3'.
Could you add the comment about '3' or add the constant definition '3'?

> +
> +	dfi->channel_mask = 1;

nitpick.
On other rkXXXX_dfi_init, use GENMASK() to initialize 'dfi->channel_mask'.
In order to keep the consistency, it is better to use BIT() macro as following:
	dfi->channel_mask = BIT(0);

> +
> +	return 0;
> +};
> +
>  static const struct of_device_id rockchip_dfi_id_match[] = {
>  	{ .compatible = "rockchip,rk3399-dfi", .data = rk3399_dfi_init },
> +	{ .compatible = "rockchip,rk3568-dfi", .data = rk3568_dfi_init },
>  	{ },
>  };
> +
>  MODULE_DEVICE_TABLE(of, rockchip_dfi_id_match);
>  
>  static int rockchip_dfi_probe(struct platform_device *pdev)
> diff --git a/include/soc/rockchip/rk3568_grf.h b/include/soc/rockchip/rk3568_grf.h
> new file mode 100644
> index 0000000000000..575584e9d8834
> --- /dev/null
> +++ b/include/soc/rockchip/rk3568_grf.h
> @@ -0,0 +1,12 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +#ifndef __SOC_RK3568_GRF_H
> +#define __SOC_RK3568_GRF_H
> +
> +#define RK3568_PMUGRF_OS_REG2		0x208
> +#define RK3568_PMUGRF_OS_REG2_DRAMTYPE_INFO		GENMASK(15, 13)
> +
> +#define RK3568_PMUGRF_OS_REG3		0x20c
> +#define RK3568_PMUGRF_OS_REG3_DRAMTYPE_INFO_V3		GENMASK(13, 12)
> +#define RK3568_PMUGRF_OS_REG3_SYSREG_VERSION		GENMASK(31, 28)
> +
> +#endif /* __SOC_RK3568_GRF_H */

-- 
Best Regards,
Samsung Electronics
Chanwoo Choi