linux-kernel - Re: [PATCH v4 4/4] mmc: dw_mmc-rockchip: Add support for rk3576 SoCs

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Message-ID: <dc77f6dbdfc68369d02005763143cdea@manjaro.org>
Date: Mon, 26 Aug 2024 16:07:49 +0200
From: Dragan Simic <dsimic@...jaro.org>
To: Detlev Casanova <detlev.casanova@...labora.com>
Cc: linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>, Jaehoon
 Chung <jh80.chung@...sung.com>, linux-mmc@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v4 4/4] mmc: dw_mmc-rockchip: Add support for rk3576 SoCs

Hello Detlev,

On 2024-08-23 15:20, Detlev Casanova wrote:
> On Friday, 23 August 2024 03:00:57 EDT Dragan Simic wrote:
>> Hello Detlev,
>> 
>> Please see a comment below.
>> 
>> On 2024-08-22 23:15, Detlev Casanova wrote:
>> > On rk3576 the tunable clocks are inside the controller itself, removing
>> > the need for the "ciu-drive" and "ciu-sample" clocks.
>> >
>> > That makes it a new type of controller that has its own dt_parse
>> > function.
>> >
>> > Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
>> > ---
>> >
>> >  drivers/mmc/host/dw_mmc-rockchip.c | 48 ++++++++++++++++++++++++++----
>> >  1 file changed, 43 insertions(+), 5 deletions(-)
>> >
>> > diff --git a/drivers/mmc/host/dw_mmc-rockchip.c
>> > b/drivers/mmc/host/dw_mmc-rockchip.c
>> > index 1458cb5fd5c7..7c8ccf5e71bc 100644
>> > --- a/drivers/mmc/host/dw_mmc-rockchip.c
>> > +++ b/drivers/mmc/host/dw_mmc-rockchip.c
> [...]
>> > @@ -435,13 +451,25 @@ static int dw_mci_rk3288_parse_dt(struct dw_mci
>> > *host)
>> >
>> >  	if (IS_ERR(priv->sample_clk))
>> >
>> >  		dev_dbg(host->dev, "ciu-sample not available\n");
>> >
>> > -	host->priv = priv;
>> > -
>> >
>> >  	priv->internal_phase = false;
>> >
>> >  	return 0;
>> >
>> >  }
>> >
>> > +static int dw_mci_rk3576_parse_dt(struct dw_mci *host)
>> > +{
>> > +	struct dw_mci_rockchip_priv_data *priv;
>> > +	int err = dw_mci_common_parse_dt(host);
>> > +	if (err)
>> > +		return err;
>> > +
>> > +	priv = host->priv;
>> > +
>> > +	priv->internal_phase = true;
>> 
>> Defining priv, assigning it and using it seems rather redundant,
>> when all that's needed is simple "host->priv->internal_phase = true"
>> assignment instead.
> 
> Yes, that's what I did at first, but host->priv is declared as void*, 
> which
> means it needs to be cast to struct dw_mci_rockchip_priv_data * and I 
> felt
> that
> 
> ((struct dw_mci_rockchip_priv_data *)host->priv)->internal_phase = 
> true;
> 
> is not very pretty and harder to read.

Ah, you're right, and I somehow managed to ignore that.

I agree with your conclusions, although I'd suggest something like
this, for slightly improved readability:

  +static int dw_mci_rk3576_parse_dt(struct dw_mci *host)
  +{
  +	struct dw_mci_rockchip_priv_data *priv = host->priv;
  +	int err;
  +
  +	err = dw_mci_common_parse_dt(host);
  +	if (err)
  +		return err;
  +
  +	priv->internal_phase = true;
  +
  +	return 0;
  +}