linux-kernel - Re: [PATCH 01/18] phy: mediatek: add a new helper to update bitfield

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Date:   Thu, 22 Sep 2022 10:36:17 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Vinod Koul <vkoul@...nel.org>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Jitao Shi <jitao.shi@...iatek.com>,
        "Stanley Chu" <stanley.chu@...iatek.com>
Subject: Re: [PATCH 01/18] phy: mediatek: add a new helper to update bitfield

On Wed, 2022-09-21 at 10:15 +0200, AngeloGioacchino Del Regno wrote:
> Il 20/09/22 11:00, Chunfeng Yun ha scritto:
> > Due to FIELD_PREP() macro can be used to prepare a bitfield value,
> > local ones can be remove; add the new helper to make bitfield
> > update
> > easier.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >   drivers/phy/mediatek/phy-mtk-io.h | 7 +++++++
> >   1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/phy/mediatek/phy-mtk-io.h
> > b/drivers/phy/mediatek/phy-mtk-io.h
> > index 500fcdab165d..a723d4afc9b4 100644
> > --- a/drivers/phy/mediatek/phy-mtk-io.h
> > +++ b/drivers/phy/mediatek/phy-mtk-io.h
> > @@ -8,6 +8,7 @@
> >   #ifndef __PHY_MTK_H__
> >   #define __PHY_MTK_H__
> >   
> > +#include <linux/bitfield.h>
> >   #include <linux/io.h>
> >   
> >   static inline void mtk_phy_clear_bits(void __iomem *reg, u32
> > bits)
> > @@ -35,4 +36,10 @@ static inline void mtk_phy_update_bits(void
> > __iomem *reg, u32 mask, u32 val)
> >   	writel(tmp, reg);
> >   }
> >   
> > +/* field @mask should be constant and continuous */
> 
> "Field @mask shall be [...]"
>               ^^^^^
Ok, will modify it

> 
> > +static inline void mtk_phy_update_field(void __iomem *reg, u32
> > mask, u32 val)
> 
> ...so, (void __iomem *reg, const u32 mask, u32 val)
Maybe no need const, @mask will be checked it in compile time when
use FIELD_PREP(), means @mask is a constant value, but not a variable.

Thanks

> 
> > +{
> > +	mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val));
> > +}
> > +
> >   #endif
> 
>