linux-kernel - Re: [PATCH v6 08/16] clk: mediatek: reset: Support inuput argument index mode

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Date:   Tue, 3 May 2022 14:37:36 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>, mturquette@...libre.com,
        sboyd@...nel.org, matthias.bgg@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     p.zabel@...gutronix.de, chun-jie.chen@...iatek.com,
        wenst@...omium.org, runyang.chen@...iatek.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v6 08/16] clk: mediatek: reset: Support inuput argument
 index mode

Il 03/05/22 11:38, Rex-BC Chen ha scritto:
> There is a large number of mediatek infra reset bits, but we do not use
> all of them. In addition, the proper input argement of reset controller
> soulde be index.
> Therefore, to be compatible with previous drivers and usage, we add
> description variables to store the ids which can mapping to index.
> 
> To use this mode, we need to put the id in rst_idx_map to map from
> index to ids. For example, if we want to input index 1 (this index
> is used to set bank 1 bit 14) for svs, we need to declare the reset
> controller like this:
> 
> In drivers:
> static u16 rst_ofs[] = {
>          0x120, 0x130, 0x140, 0x150, 0x730,
> };
> 
> static u16 rst_idx_map[] = {
>          0 * 32 + 0,
>          1 * 32 + 14,
>          ....
> };
> 
> static const struct mtk_clk_rst_desc clk_rst_desc = {
>          .version = MTK_RST_SET_CLR,
>          .rst_bank_ofs = rst_ofs,
>          .rst_bank_nr = ARRAY_SIZE(rst_ofs),
>          .rst_idx_map = rst_idx_map,
>          .rst_idx_map_nr = ARRAY_SIZE(rst_idx_map),
> };
> 
> In dts:
> svs: {
>          ...
>          resets = <&infra 1>;
>          ...
> };
> 
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>