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From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>, Vinod Koul <vkoul@kernel.org>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
	Rob Herring <robh+dt@kernel.org>,
	 Matthias Brugger <matthias.bgg@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org,
	linux-phy@lists.infradead.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Eddie Hung <eddie.hung@mediatek.com>
Subject: Re: [PATCH v2 3/5] phy: mediatek: add helpers to update bits of registers
Date: Fri, 24 Dec 2021 11:10:54 +0100	[thread overview]
Message-ID: <047803b9-d09f-d4f8-a674-317cc19dd055@collabora.com> (raw)
In-Reply-To: <20211218082802.5256-3-chunfeng.yun@mediatek.com>

Il 18/12/21 09:28, Chunfeng Yun ha scritto:
> Add three helpers mtk_phy_clear/set/update_bits() for registers operation
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v2: new patch, add register access helpers,
>      Add updatel() macro suggested by Vinod, here add more ones instead.
> ---
>   drivers/phy/mediatek/phy-mtk-io.h | 38 +++++++++++++++++++++++++++++++
>   1 file changed, 38 insertions(+)
>   create mode 100644 drivers/phy/mediatek/phy-mtk-io.h
> 
> diff --git a/drivers/phy/mediatek/phy-mtk-io.h b/drivers/phy/mediatek/phy-mtk-io.h
> new file mode 100644
> index 000000000000..500fcdab165d
> --- /dev/null
> +++ b/drivers/phy/mediatek/phy-mtk-io.h
> @@ -0,0 +1,38 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2021 MediaTek Inc.
> + *
> + * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
> + */
> +
> +#ifndef __PHY_MTK_H__
> +#define __PHY_MTK_H__
> +
> +#include <linux/io.h>
> +
> +static inline void mtk_phy_clear_bits(void __iomem *reg, u32 bits)
> +{
> +	u32 tmp = readl(reg);
> +
> +	tmp &= ~bits;
> +	writel(tmp, reg);
> +}
> +
> +static inline void mtk_phy_set_bits(void __iomem *reg, u32 bits)
> +{
> +	u32 tmp = readl(reg);
> +
> +	tmp |= bits;
> +	writel(tmp, reg);
> +}
> +
> +static inline void mtk_phy_update_bits(void __iomem *reg, u32 mask, u32 val)
> +{
> +	u32 tmp = readl(reg);
> +
> +	tmp &= ~mask;
> +	tmp |= val & mask;
> +	writel(tmp, reg);
> +}
> +
> +#endif
> 

These helpers are almost exactly duplicating what regmap_update_bits() is doing.
I appreciate the effort to stop open-coding the same sequences over and over by
adding such helper functions, but I think that the proper way of doing what you
are proposing is not to add custom functions but rather reuse what the Linux APIs
give you.

What about doing a conversion to use regmap on this driver?

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  reply	other threads:[~2021-12-24 10:11 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-18  8:27 [PATCH v2 1/5] dt-bindings: phy: mediatek: tphy: support software efuse load Chunfeng Yun
2021-12-18  8:27 ` [PATCH v2 2/5] phy: phy-mtk-tphy: add support efuse setting Chunfeng Yun
2021-12-24 10:03   ` AngeloGioacchino Del Regno
2021-12-30  2:13     ` Chunfeng Yun
2021-12-18  8:28 ` [PATCH v2 3/5] phy: mediatek: add helpers to update bits of registers Chunfeng Yun
2021-12-24 10:10   ` AngeloGioacchino Del Regno [this message]
2021-12-30  2:06     ` Chunfeng Yun
2022-01-03  8:59       ` AngeloGioacchino Del Regno
2022-01-06  8:08         ` Chunfeng Yun
2021-12-18  8:28 ` [PATCH v2 4/5] phy: phy-mtk-xsphy: use new io helpers to access register Chunfeng Yun
2021-12-18  8:28 ` [PATCH v2 5/5] phy: phy-mtk-tphy: " Chunfeng Yun
2021-12-23 11:37 ` [PATCH v2 1/5] dt-bindings: phy: mediatek: tphy: support software efuse load Vinod Koul

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