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From: Stephen Boyd <sboyd@kernel.org>
To: Dong Aisheng <dongas86@gmail.com>
Cc: Dong Aisheng <aisheng.dong@nxp.com>,
	linux-clk <linux-clk@vger.kernel.org>,
	"moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
	<linux-arm-kernel@lists.infradead.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	dl-linux-imx <linux-imx@nxp.com>,
	Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH V4 08/11] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree
Date: Mon, 16 Sep 2019 11:45:04 -0700
Message-ID: <20190916184505.256CB20665@mail.kernel.org> (raw)
In-Reply-To: <CAA+hA=QJwfHsRA+G2oT2awLxx659qXLPsiECV6VYcJ181c6D8w@mail.gmail.com>

Quoting Dong Aisheng (2019-09-09 04:23:14)
> ]On Sat, Sep 7, 2019 at 5:35 PM Stephen Boyd <sboyd@kernel.org> wrote:
> >
> > Quoting Dong Aisheng (2019-08-20 04:13:22)
> > > Add parsing clocks from device tree.
> >
> > Please describe some more here.
> 
> Will improve.
> 
> > > +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > +       base = devm_ioremap_resource(&pdev->dev, res);
> > > +       if (IS_ERR(base))
> > > +               return PTR_ERR(base);
> > > +
> > > +       count = of_property_count_u32_elems(np, "clock-indices");
> > > +       if (count < 0) {
> > > +               dev_err(&pdev->dev, "failed to count clocks\n");
> > > +               return -EINVAL;
> > > +       }
> >
> > Is 'count' expected to be equal to IMX_LPCG_MAX_CLKS? Because later on
> > in this function we set the num of clks to the MAX instead of the count
> > from clock-indices.
> >
> 
> No. Here is a tricky to ease the clk getting.
> For example, one LPCG supports up to 8 clock outputs which each of them
> is fixed to 4 bits. Then we can easily use the bit-offset/clk-indices
> parsed from DT
> to fetch the corresponding clock by hws[clkspec->args[0] / 4].
> And the cost is very limited with only a few pointers.

Ok. Can you add a comment into the code to explain this?


  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 11:13 [PATCH V4 00/11] clk: imx8: add new clock binding for better pm support Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 01/11] dt-bindings: firmware: imx-scu: new binding to parse clocks from device tree Dong Aisheng
2019-08-24 19:19   ` Shawn Guo
2019-08-26  3:24     ` Aisheng Dong
2019-08-27 17:04   ` Rob Herring
2019-09-06 16:56   ` Stephen Boyd
2019-08-20 11:13 ` [PATCH V4 02/11] dt-bindings: clock: imx-lpcg: add support " Dong Aisheng
2019-08-24 19:21   ` Shawn Guo
2019-08-26  3:14     ` Aisheng Dong
2019-08-26  3:21     ` Aisheng Dong
2019-08-27 17:05   ` Rob Herring
2019-09-06 17:00   ` Stephen Boyd
2019-08-20 11:13 ` [PATCH V4 03/11] clk: imx: scu: add two cells binding support Dong Aisheng
2019-09-06 17:06   ` Stephen Boyd
2019-09-09 10:23     ` Dong Aisheng
2019-09-16 18:44       ` Stephen Boyd
2019-08-20 11:13 ` [PATCH V4 04/11] clk: imx: scu: bypass cpu power domains Dong Aisheng
2019-09-06 17:07   ` Stephen Boyd
2019-09-09 10:24     ` Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 05/11] clk: imx: scu: allow scu clk to take device pointer Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 06/11] clk: imx: scu: add runtime pm support Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 07/11] clk: imx: scu: add suspend/resume support Dong Aisheng
2019-09-06 17:09   ` Stephen Boyd
2019-09-09 10:35     ` Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 08/11] clk: imx: imx8qxp-lpcg: add parsing clocks from device tree Dong Aisheng
2019-09-06 17:13   ` Stephen Boyd
2019-09-09 11:23     ` Dong Aisheng
2019-09-16 18:45       ` Stephen Boyd [this message]
2019-08-20 11:13 ` [PATCH V4 09/11] clk: imx: lpcg: allow lpcg clk to take device pointer Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 10/11] clk: imx: clk-imx8qxp-lpcg: add runtime pm support Dong Aisheng
2019-08-20 11:13 ` [PATCH V4 11/11] clk: imx: lpcg: add suspend/resume support Dong Aisheng
2019-09-06 17:14   ` Stephen Boyd
2019-09-09 11:39     ` Dong Aisheng
2019-09-09 12:21 ` [PATCH V4 00/11] clk: imx8: add new clock binding for better pm support Oliver Graute

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