linux-kernel - Re: [PATCH 3/5] memory: tegra: Sort tegra210

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Date:   Thu, 8 Oct 2020 13:26:16 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     thierry.reding@...il.com, robh+dt@...nel.org, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] memory: tegra: Sort tegra210_swgroups by reg address

Hi Krzysztof,

On Thu, Oct 08, 2020 at 12:32:58PM +0200, Krzysztof Kozlowski wrote:
> On Wed, Oct 07, 2020 at 05:37:44PM -0700, Nicolin Chen wrote:
> > This is a cleanup change to prepare for new swgroups.
> 
> What type of cleanup? Any functional change?

It's to sort the swgroup list by reg address as I mentioned in
the subject. Perhaps I should have put in commit message also.

> > 
> > Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
> > ---
> >  drivers/memory/tegra/tegra210.c | 20 ++++++++++----------
> >  1 file changed, 10 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/memory/tegra/tegra210.c b/drivers/memory/tegra/tegra210.c
> > index e8a7d266802c..b400802c9f14 100644
> > --- a/drivers/memory/tegra/tegra210.c
> > +++ b/drivers/memory/tegra/tegra210.c
> > @@ -1020,32 +1020,32 @@ static const struct tegra_mc_client tegra210_mc_clients[] = {
> >  };
> >  
> >  static const struct tegra_smmu_swgroup tegra210_swgroups[] = {
> > -	{ .name = "dc",        .swgroup = TEGRA_SWGROUP_DC,        .reg = 0x240 },
> > -	{ .name = "dcb",       .swgroup = TEGRA_SWGROUP_DCB,       .reg = 0x244 },
> >  	{ .name = "afi",       .swgroup = TEGRA_SWGROUP_AFI,       .reg = 0x238 },
> >  	{ .name = "avpc",      .swgroup = TEGRA_SWGROUP_AVPC,      .reg = 0x23c },
> > -	{ .name = "hda",       .swgroup = TEGRA_SWGROUP_HDA,       .reg = 0x254 },
> > +	{ .name = "dc",        .swgroup = TEGRA_SWGROUP_DC,        .reg = 0x240 },
> > +	{ .name = "dcb",       .swgroup = TEGRA_SWGROUP_DCB,       .reg = 0x244 },
> >  	{ .name = "hc",        .swgroup = TEGRA_SWGROUP_HC,        .reg = 0x250 },
> > +	{ .name = "hda",       .swgroup = TEGRA_SWGROUP_HDA,       .reg = 0x254 },
> > +	{ .name = "isp2",      .swgroup = TEGRA_SWGROUP_ISP2,      .reg = 0x258 },
> >  	{ .name = "nvenc",     .swgroup = TEGRA_SWGROUP_NVENC,     .reg = 0x264 },
> >  	{ .name = "ppcs",      .swgroup = TEGRA_SWGROUP_PPCS,      .reg = 0x270 },
> >  	{ .name = "sata",      .swgroup = TEGRA_SWGROUP_SATA,      .reg = 0x274 },
> > -	{ .name = "isp2",      .swgroup = TEGRA_SWGROUP_ISP2,      .reg = 0x258 },
> > +	{ .name = "vi",        .swgroup = TEGRA_SWGROUP_VI,        .reg = 0x280 },
> > +	{ .name = "vic",       .swgroup = TEGRA_SWGROUP_VIC,       .reg = 0x284 },
> >  	{ .name = "xusb_host", .swgroup = TEGRA_SWGROUP_XUSB_HOST, .reg = 0x288 },
> >  	{ .name = "xusb_dev",  .swgroup = TEGRA_SWGROUP_XUSB_DEV,  .reg = 0x28c },
> > -	{ .name = "isp2b",     .swgroup = TEGRA_SWGROUP_ISP2B,     .reg = 0xaa4 },
> > -	{ .name = "tsec",      .swgroup = TEGRA_SWGROUP_TSEC,      .reg = 0x294 },
> >  	{ .name = "a9avp",     .swgroup = TEGRA_SWGROUP_A9AVP,     .reg = 0x290 },
> 
> I must say I cannot find the order. By name - not. By swgroup name -
> not. By register - not.
> 
> What is the order then?

It's by "reg" as I mentioned in the commit subject. Probably
it's not that obvious by looking at the change itself :-/

Its following change of adding new swgroups would be easier
to insert by following the same order of "reg" addresses.

Thanks