linux-kernel - Re: [PATCH v4 03/13] memory: mtk-smi: Use clk

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Date:   Fri, 15 Oct 2021 15:38:40 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, youlin.pei@...iatek.com,
        anan.sun@...iatek.com, ming-fan.chen@...iatek.com,
        yi.kuo@...iatek.com, anthony.huang@...iatek.com,
        Ikjoon Jang <ikjn@...omium.org>
Subject: Re: [PATCH v4 03/13] memory: mtk-smi: Use clk_bulk clock ops

> Use clk_bulk interface instead of the orginal one to simplify the code.
> 
> For SMI larbs: Require apb/smi clocks while gals is optional.
> For SMI common: Require apb/smi/gals0/gal1 in has_gals case. Otherwise,
>                  also only require apb/smi, No optional clk here.
> 
> About the "has_gals" flag, for smi larbs, the gals clock also may be
> optional even this platform support it. thus it always use
> *_bulk_get_optional, then the flag has_gals is unnecessary. Remove it.
> The smi_common's has_gals still keep it.
> 
> Also remove clk fail logs since bulk interface already output fail log.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

Hello Yong,
thanks for the patch! However, I have an improvement to point out:

> ---
>   drivers/memory/mtk-smi.c | 143 +++++++++++++++------------------------
>   1 file changed, 55 insertions(+), 88 deletions(-)
> 
> diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c
> index c5fb51f73b34..f91eaf5c3ab0 100644
> --- a/drivers/memory/mtk-smi.c
> +++ b/drivers/memory/mtk-smi.c
> @@ -60,6 +60,20 @@ enum mtk_smi_gen {
>   	MTK_SMI_GEN2
>   };
>   
> +#define MTK_SMI_CLK_NR_MAX			4

This refers to mtk_smi_common_clks[] and should be probably moved after that.
In any case, I don't think that there's any need to manually define this as 4,
as you can simply use the macro ARRAY_SIZE(mtk_smi_common_clks).
Using that will make you able to not update this definition everytime an update
occurs to the mtk_smi_common_clks array.

> +
> +/* larbs: Require apb/smi clocks while gals is optional. */
> +static const char * const mtk_smi_larb_clks[] = {"apb", "smi", "gals"};
> +#define MTK_SMI_LARB_REQ_CLK_NR		2
> +#define MTK_SMI_LARB_OPT_CLK_NR		1
> +
> +/*
> + * common: Require these four clocks in has_gals case. Otherwise, only apb/smi are required.
> + */
> +static const char * const mtk_smi_common_clks[] = {"apb", "smi", "gals0", "gals1"};
> +#define MTK_SMI_COM_REQ_CLK_NR		2
> +#define MTK_SMI_COM_GALS_REQ_CLK_NR	MTK_SMI_CLK_NR_MAX
> +

Apart from that,
Acked-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Regards,
- Angelo