linux-kernel - Re: [PATCH v3 4/5] clk: mediatek: Add USB clock support in MT8173 APMIXEDSYS

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Message-ID: <1436841935.9416.10.camel@mtksdaap41>
Date:	Tue, 14 Jul 2015 10:45:35 +0800
From:	James Liao <jamesjj.liao@...iatek.com>
To:	Daniel Kurtz <djkurtz@...omium.org>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	"Heiko Stubner" <heiko@...ech.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Ricky Liang <jcliang@...omium.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3 4/5] clk: mediatek: Add USB clock support in MT8173
 APMIXEDSYS

Hi Daniel,

On Mon, 2015-07-13 at 22:46 +0800, Daniel Kurtz wrote:

> > +static const struct clk_ops mtk_ref2usb_tx_ops = {
> > +       .is_prepared    = mtk_ref2usb_tx_is_prepared,
> > +       .prepare        = mtk_ref2usb_tx_prepare,
> > +       .unprepare      = mtk_ref2usb_tx_unprepare,
> > +};
> 
> Burying the implementation of this special "mtk_ref2usb" clock in
> clk-mt8173,c seems a bit awkward.
> Can you please move it to its own file, like mediatek/clk-usb.c?

Do you mean clk/mediatek/clk-usb.c?

This clock is a MT8173 specific clock, which may not be reused by other
SoCs. So I think it's not necessary to move it to a separated file.

> > +
> > +static struct clk *mtk_clk_register_ref2usb_tx(const char *name,
> > +                       const char *parent_name, void __iomem *reg)
> > +{
> > +       struct mtk_ref2usb_tx *tx;
> > +       struct clk_init_data init = {};
> > +       struct clk *clk;
> > +
> > +       tx = kzalloc(sizeof(*tx), GFP_KERNEL);
> > +       if (!tx)
> > +               return ERR_PTR(-ENOMEM);
> > +
> > +       tx->base_addr = reg;
> > +       tx->hw.init = &init;
> > +
> > +       init.name = name;
> > +       init.ops = &mtk_ref2usb_tx_ops;
> > +       init.parent_names = &parent_name;
> > +       init.num_parents = 1;
> > +
> > +       clk = clk_register(NULL, &tx->hw);
> > +
> > +       if (IS_ERR(clk)) {
> > +               pr_err("Failed to register clk %s: %ld\n", name, PTR_ERR(clk));
> > +               kfree(tx);
> > +       }
> > +
> > +       return clk;
> > +}
> > +
> > +struct mtk_apmixed_ex {
> > +       int id;
> > +       const char *name;
> > +       const char *parent;
> > +       u32 reg_ofs;
> > +};
> > +
> > +#define APMIXED_EX(_id, _name, _parent, _reg_ofs) {                    \
> > +               .id = _id,                                              \
> > +               .name = _name,                                          \
> > +               .parent = _parent,                                      \
> > +               .reg_ofs = _reg_ofs,                                    \
> > +       }
> > +
> > +static const struct mtk_apmixed_ex apmixed_ex[] = {
> 
> __initconst

OK. I'll fix it in next patch.

> > +       APMIXED_EX(CLK_APMIXED_REF2USB_TX, "ref2usb_tx", "clk26m", 0x8),
> > +};
> > +
> > +static void __init mtk_clk_register_apmixedsys_special(struct device_node *node,
> > +                       struct clk_onecell_data *clk_data)
> > +{
> > +       void __iomem *base;
> > +       struct clk *clk;
> > +       int i;
> > +
> > +       base = of_iomap(node, 0);
> > +       if (!base) {
> > +               pr_err("%s(): ioremap failed\n", __func__);
> > +               return;
> > +       }
> > +
> > +       for (i = 0; i < ARRAY_SIZE(apmixed_ex); i++) {
> > +               const struct mtk_apmixed_ex *ape = &apmixed_ex[i];
> > +
> > +               clk = mtk_clk_register_ref2usb_tx(ape->name, ape->parent,
> > +                                                       base + ape->reg_ofs);
> > +
> > +               if (IS_ERR(clk)) {
> > +                       pr_err("Failed to register clk %s: %ld\n", ape->name,
> > +                                       PTR_ERR(clk));
> > +                       continue;
> > +               }
> > +
> > +               clk_data->clks[CLK_APMIXED_REF2USB_TX] = clk;
> 
> This works assuming ARRAY_SIZE(apmixed_ex) == 1.
> Either remove the loop since it is unnecessary, or do:
>   clk_data->clks[ape->id] = clk;

It should be "clk_data->clks[ape->id] = clk". I'll fix it in next patch.


Best regards,

James

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