linux-kernel - Re: [PATCH v2 2/5] clk: mediatek: modify MT7622 audsys to adapt MFD device

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Date:   Thu, 8 Feb 2018 13:57:27 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-clk@...r.kernel.org>,
        Garlic Tseng <garlic.tseng@...iatek.com>
Subject: Re: [PATCH v2 2/5] clk: mediatek: modify MT7622 audsys to adapt MFD
 device

On Wed, 2018-02-07 at 16:18 +0100, Matthias Brugger wrote:
> 
> On 02/05/2018 05:07 AM, Ryder Lee wrote:
> > On Sat, 2018-02-03 at 15:26 +0100, Matthias Brugger wrote:
> >>
> >> On 01/31/2018 08:42 AM, Ryder Lee wrote:
> >>> As the new MFD parent is in place, switch probing method to adapt it.
> >>>
> >>> Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> >>> ---
> >>>  drivers/clk/mediatek/clk-mt7622-aud.c | 3 ++-
> >>>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/clk/mediatek/clk-mt7622-aud.c b/drivers/clk/mediatek/clk-mt7622-aud.c
> >>> index 13f752d..8c18536 100644
> >>> --- a/drivers/clk/mediatek/clk-mt7622-aud.c
> >>> +++ b/drivers/clk/mediatek/clk-mt7622-aud.c
> >>> @@ -142,11 +142,12 @@ static int clk_mt7622_audiosys_init(struct platform_device *pdev)
> >>>  {
> >>>  	struct clk_onecell_data *clk_data;
> >>>  	struct device_node *node = pdev->dev.of_node;
> >>> +	struct device_node *pnode = pdev->dev.parent->of_node;
> >>>  	int r;
> >>>  
> >>>  	clk_data = mtk_alloc_clk_data(CLK_AUDIO_NR_CLK);
> >>>  
> >>> -	mtk_clk_register_gates(node, audio_clks, ARRAY_SIZE(audio_clks),
> >>> +	mtk_clk_register_gates(pnode, audio_clks, ARRAY_SIZE(audio_clks),
> >>
> >> We will need a fallback here for older device tree bindings.
> >>
> >> Regards,
> >> Matthias
> > 
> > Up to now, I didn't see both driver and bindings are used anywhere.
> > Should I still care about that?
> > 
> 
> Yes please, we have to ensure that newer kernel work with older bindings and
> vice-versa.

OKay. An unrelated question - is it possible to change the compatible
string (*-audsys-clk) without breaking backward compatible?