linux-kernel - Re: [PATCH V2 09/12] clk: mediatek: reset: Add support for input offset and bit from DT

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Date:   Thu, 21 Apr 2022 11:07:42 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>, mturquette@...libre.com,
        sboyd@...nel.org
Cc:     matthias.bgg@...il.com, p.zabel@...gutronix.de,
        chun-jie.chen@...iatek.com, wenst@...omium.org,
        runyang.chen@...iatek.com, linux-kernel@...r.kernel.org,
        allen-kh.cheng@...iatek.com, 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 V2 09/12] clk: mediatek: reset: Add support for input
 offset and bit from DT

Il 20/04/22 15:05, Rex-BC Chen ha scritto:
> To use the clock reset function easier, we implement the of_xlate.
> This function is only adopted in version MTK_SET_CLR because of
> the method of id calculation.
> 
> There is no impact for original use. If the argument number is not
> larger than 1, it will return original id.
> 
> With this implementation if we want to set offset 0x120 and bit 16,
> we can just write something like "resets = <&infra_rst 0x120 16>;".
> 
> Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
> ---
>   drivers/clk/mediatek/reset.c | 24 ++++++++++++++++++++++++
>   drivers/clk/mediatek/reset.h |  1 +
>   2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/clk/mediatek/reset.c b/drivers/clk/mediatek/reset.c
> index 1173111af3ab..dbe812062bf5 100644
> --- a/drivers/clk/mediatek/reset.c
> +++ b/drivers/clk/mediatek/reset.c
> @@ -59,6 +59,20 @@ static const struct reset_control_ops mtk_reset_ops_set_clr = {
>   	.reset = mtk_reset_set_clr,
>   };
>   
> +static int reset_xlate(struct reset_controller_dev *rcdev,
> +		       const struct of_phandle_args *reset_spec)
> +{
> +	unsigned int offset, bit;
> +
> +	if (reset_spec->args_count <= 1)
> +		return reset_spec->args[0];
> +
> +	offset = reset_spec->args[0];
> +	bit = reset_spec->args[1];
> +
> +	return (offset >> 4) * 32 + bit;
> +}
> +
>   static const struct reset_control_ops *rst_op[MTK_RST_MAX] = {
>   	[MTK_RST_SIMPLE] = &reset_simple_ops,
>   	[MTK_RST_SET_CLR] = &mtk_reset_ops_set_clr,
> @@ -98,6 +112,11 @@ int mtk_clk_register_rst_ctrl(struct device_node *np,
>   	data->rcdev.ops = rst_op[desc->version];
>   	data->rcdev.of_node = np;
>   
> +	if (desc->version == MTK_RST_SET_CLR) {

...following my previous advice to use switch(version), this would fit in
just fine :-)

Everything else looks ok.

Cheers,
Angelo