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Date: Mon, 19 Aug 2019 07:30:49 +0000
From: Wen He <wen.he_1@....com>
To: Stephen Boyd <sboyd@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Michael Turquette <mturquette@...libre.com>,
Rob Herring <robh+dt@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
"linux-devel@...ux.nxdi.nxp.com" <linux-devel@...ux.nxdi.nxp.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: Leo Li <leoyang.li@....com>,
"liviu.dudau@....com" <liviu.dudau@....com>
Subject: RE: [EXT] Re: [v2 2/3] clk: ls1028a: Add clock driver for Display
output interface
> -----Original Message-----
> From: Stephen Boyd <sboyd@...nel.org>
> Sent: 2019年8月17日 1:46
> To: Mark Rutland <mark.rutland@....com>; Michael Turquette
> <mturquette@...libre.com>; Rob Herring <robh+dt@...nel.org>; Shawn Guo
> <shawnguo@...nel.org>; Wen He <wen.he_1@....com>;
> devicetree@...r.kernel.org; linux-clk@...r.kernel.org;
> linux-devel@...ux.nxdi.nxp.com; linux-kernel@...r.kernel.org
> Cc: Leo Li <leoyang.li@....com>; liviu.dudau@....com; Wen He
> <wen.he_1@....com>
> Subject: [EXT] Re: [v2 2/3] clk: ls1028a: Add clock driver for Display output
> interface
>
> Caution: EXT Email
>
> Quoting Wen He (2019-08-15 03:16:12)
> > diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index
> > 801fa1cd0321..3c95d8ec31d4 100644
> > --- a/drivers/clk/Kconfig
> > +++ b/drivers/clk/Kconfig
> > @@ -223,6 +223,16 @@ config CLK_QORIQ
> > This adds the clock driver support for Freescale QorIQ platforms
> > using common clock framework.
> >
> > +config CLK_LS1028A_PLLDIG
> > + bool "Clock driver for LS1028A Display output"
> > + depends on (ARCH_LAYERSCAPE || COMPILE_TEST) && OF
>
> Where is the OF dependency to build anything? Doesn't this still compile
> without CONFIG_OF set?
Yes, current included some APIs of the OF, like of_get_parent_name()
>
> > + default ARCH_LAYERSCAPE
> > + help
> > + This driver support the Display output interfaces(LCD, DPHY)
> pixel clocks
> > + of the QorIQ Layerscape LS1028A, as implemented TSMC
> CLN28HPM PLL. Not all
> > + features of the PLL are currently supported by the driver. By
> default,
> > + configured bypass mode with this PLL.
>
> These lines look sort of long. Are they under 80 columns?
>
Yes, they had been checked by the checkpatch.pl.
> > +
> > config COMMON_CLK_XGENE
> > bool "Clock driver for APM XGene SoC"
> > default ARCH_XGENE
> > diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index
> > 0cad76021297..c8e22a764c4d 100644
> > --- a/drivers/clk/Makefile
> > +++ b/drivers/clk/Makefile
> > @@ -44,6 +44,7 @@ obj-$(CONFIG_COMMON_CLK_OXNAS)
> += clk-oxnas.o
> > obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
> > obj-$(CONFIG_COMMON_CLK_PWM) += clk-pwm.o
> > obj-$(CONFIG_CLK_QORIQ) += clk-qoriq.o
> > +obj-$(CONFIG_CLK_LS1028A_PLLDIG) += clk-plldig.o
> > obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o
> > obj-$(CONFIG_COMMON_CLK_HI655X) += clk-hi655x.o
> > obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
> > diff --git a/drivers/clk/clk-plldig.c b/drivers/clk/clk-plldig.c new
> > file mode 100644 index 000000000000..60988b0ea20a
> > --- /dev/null
> > +++ b/drivers/clk/clk-plldig.c
> > @@ -0,0 +1,278 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +// Copyright 2019 NXP
> > +
> > +/*
> > + * Clock driver for LS1028A Display output interfaces(LCD, DPHY).
> > + */
> > +
> > +#include <linux/clk-provider.h>
> > +#include <linux/device.h>
> > +#include <linux/module.h>
> > +#include <linux/err.h>
> > +#include <linux/io.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/of.h>
> [...]
> > +
> > +static int plldig_clk_probe(struct platform_device *pdev) {
> > + struct clk_plldig *data;
> > + struct resource *mem;
> > + const char *parent_name;
> > + struct clk_init_data init = {};
> > + struct device *dev = &pdev->dev;
> > + int ret;
> > +
> > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> > + if (!data)
> > + return -ENOMEM;
> > +
> > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + data->regs = devm_ioremap_resource(dev, mem);
> > + if (IS_ERR(data->regs))
> > + return PTR_ERR(data->regs);
> > +
> > + init.name = dev->of_node->name;
> > + init.ops = &plldig_clk_ops;
> > + parent_name = of_clk_get_parent_name(dev->of_node, 0);
> > + init.parent_names = &parent_name;
>
> Can you use the new way of specifying clk parents with the parent_data
> member of clk_init?
Of course, but I don't understand why need recommend to use this member?
Is that the member parent_names will be discard in future?
Here are definition of the clk-provider.h
/* Only one of the following three should be assigned */
const char * const *parent_names;
const struct clk_parent_data *parent_data;
const struct clk_hw **parent_hws;
For PLLDIG, it only has one parent.
>
> > + init.num_parents = 1;
> > +
> > + data->hw.init = &init;
> > + data->dev = dev;
> > +
> > + ret = devm_clk_hw_register(dev, &data->hw);
> > + if (ret) {
> > + dev_err(dev, "failed to register %s clock\n", init.name);
> > + return ret;
> > + }
> > +
> > + return of_clk_add_hw_provider(dev->of_node,
> > + of_clk_hw_simple_get,
>
> Use devm? So that driver remove frees this.
Yes, here also should be using devm_of_clk_add_hw_provider().
>
> > + &data->hw);
> > +}
> > +
> > +static int plldig_clk_remove(struct platform_device *pdev) {
> > + of_clk_del_provider(pdev->dev.of_node);
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id plldig_clk_id[] = {
> > + { .compatible = "fsl,ls1028a-plldig", .data = NULL},
> > + { }
> > +};
>
> Add a MODULE_DEVICE_TABLE(of, plldig_clk_id) here.
>
OK,
> > +
> > +static struct platform_driver plldig_clk_driver = {
> > + .driver = {
> > + .name = "plldig-clock",
> > + .of_match_table = plldig_clk_id,
> > + },
> > + .probe = plldig_clk_probe,
> > + .remove = plldig_clk_remove,
> > +};
> > +module_platform_driver(plldig_clk_driver);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_AUTHOR("Wen He <wen.he_1@....com>");
> > +MODULE_DESCRIPTION("LS1028A Display output interface pixel clock
> > +driver"); MODULE_ALIAS("platform:ls1028a-plldig");
>
> Drop MODULE_ALIAS, it's not useful.
OK,
Best Regards,
Wen
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