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Message-ID: <7FE21149F4667147B645348EC605788505626C@039-SN2MPN1-013.039d.mgd.msft.net>
Date: Thu, 15 Dec 2011 07:35:03 +0000
From: Dong Aisheng-B29396 <B29396@...escale.com>
To: Linus Walleij <linus.walleij@...aro.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
Guo Shawn-R65073 <r65073@...escale.com>,
"kernel@...gutronix.de" <kernel@...gutronix.de>,
"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
"rob.herring@...xeda.com" <rob.herring@...xeda.com>
Subject: RE: [RFC PATCH v2 2/4] pinctrl: imx: add pinmux imx driver
> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Linus Walleij
> Sent: Thursday, December 15, 2011 2:01 AM
> To: Dong Aisheng-B29396
> Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linus.walleij@...ricsson.com; s.hauer@...gutronix.de; Guo Shawn-R65073;
> kernel@...gutronix.de; grant.likely@...retlab.ca; rob.herring@...xeda.com
> Subject: Re: [RFC PATCH v2 2/4] pinctrl: imx: add pinmux imx driver
> Importance: High
>
> On Wed, Dec 14, 2011 at 5:03 PM, Dong Aisheng <b29396@...escale.com>
> wrote:
>
> > The driver contains the initial support for imx53 and imx6q.
>
> Cool! Comments below...
>
>
> > --- /dev/null
> > +++ b/drivers/pinctrl/pinmux-imx-core.c
>
> We should start naming these pinctrl-* rather than pinmux-* so just
> rename it.
>
> Until here it looks like business as usual..
>
Sure, will rename in next version.
> > +#ifdef CONFIG_OF
> > +static int __devinit imx_pmx_parse_functions(struct device_node *np,
> > + struct imx_pinctrl_info *info, u32 num) {
> > + struct imx_pmx_func *function;
> > + struct imx_pin_group *group;
> > + int ret, len;
> > +
> > + dev_dbg(info->dev, "parse function %d\n", num);
> > +
> > + group = &info->groups[num];
> > + function = &info->functions[num];
> > +
> > + /* Initialise group */
> > + ret = of_property_read_string(np, "grp_name", &group->name);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get grp_name\n");
> > + return ret;
> > + }
> > +
> > + ret = of_property_read_u32(np, "num_pins", &group->num_pins);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get num_pins\n");
> > + return ret;
> > + }
> > +
> > + ret = of_property_read_u32(np, "num_mux", &group->num_mux);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get num_mux\n");
> > + return ret;
> > + }
> > +
> > + if (group->num_pins != group->num_mux)
> > + return -EINVAL;
> > +
> > + group->pins = devm_kzalloc(info->dev, group->num_pins *
> > + sizeof(unsigned int),
> > + GFP_KERNEL);
> > + group->mux_mode = devm_kzalloc(info->dev, group->num_mux *
> > + sizeof(unsigned int),
> > + GFP_KERNEL);
> > + if (!group->pins || !group->mux_mode)
> > + return -ENOMEM;
> > +
> > + /* sanity check */
> > + if (of_get_property(np, "grp_pins", &len) &&
> > + len != group->num_pins * sizeof(unsigned int)) {
> > + dev_err(info->dev, "wrong pins number?\n");
> > + return -EINVAL;
> > + }
> > +
> > + if (of_get_property(np, "grp_mux", &len) &&
> > + len != group->num_mux * sizeof(unsigned int)) {
> > + dev_err(info->dev, "wrong pin mux number?\n");
> > + return -EINVAL;
> > + }
> > +
> > + ret = of_property_read_u32_array(np, "grp_pins",
> > + group->pins, group->num_pins);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get grp_pins\n");
> > + return ret;
> > + }
> > +
> > + ret = of_property_read_u32_array(np, "grp_mux",
> > + group->mux_mode, group->num_mux);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get grp_mux\n");
> > + return ret;
> > + }
> > +
> > + /* Initialise function */
> > + ret = of_property_read_string(np, "func_name",
> > + &function->name);
> > + if (ret) {
> > + dev_err(info->dev, "failed to get func_name\n");
> > + return ret;
> > + }
> > +
> > + function->groups = devm_kzalloc(info->dev, sizeof(char **),
> > + GFP_KERNEL);
> > + function->num_groups = 1;
> > + function->groups[0] = group->name;
> > +
> > + dev_dbg(info->dev, "func_name %s grp_name %s num_groups %d\n",
> > + function->name, function->groups[0],
> > + function->num_groups);
> > +
> > + return 0;
> > +}
> > +
> > +static int __devinit imx_pmx_probe_dt(struct platform_device *pdev,
> > + struct imx_pinctrl_info *info) {
> > + struct device_node *np = pdev->dev.of_node;
> > + struct device_node *child = NULL;
> > + int ret, i;
> > + u32 nfuncs = 0;
> > +
> > + if (!np)
> > + return -ENODEV;
> > +
> > + nfuncs = of_get_child_number(np);
> > + if (nfuncs <= 0) {
> > + dev_err(&pdev->dev, "no functions defined\n");
> > + return -EINVAL;
> > + }
> > +
> > + info->nfunctions = nfuncs;
> > + info->functions = devm_kzalloc(&pdev->dev, nfuncs *
> > + sizeof(struct imx_pmx_func),
> > + GFP_KERNEL);
> > + if (!info->functions)
> > + return -ENOMEM;
> > +
> > + /* DT file only passes one group per one function */
> > + info->ngroups = nfuncs;
> > + info->groups = devm_kzalloc(&pdev->dev, nfuncs * sizeof(struct
> > + imx_pin_group),
> > + GFP_KERNEL);
> > + if (!info->groups)
> > + return -ENOMEM;
> > +
> > + child = NULL;
> > + i = 0;
> > + for_each_child_of_node(np, child) {
> > + ret = imx_pmx_parse_functions(child, info, i++);
> > + if (ret) {
> > + dev_err(&pdev->dev, "failed to parse
> > + function\n");
> > + return ret;
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +#else
> > +static int __devinit imx_pmx_probe_dt(struct platform_device *pdev,
> > + struct imx_pinctrl_info *info) {
> > + return -ENODEV;
> > +}
> > +#endif
>
> Looks clever to me! And I think we have agreed that this probing must be
> inside each driver.
>
Yes.
> Can we have a look at the corresponding device tree?
> (...)
>
> > +++ b/drivers/pinctrl/pinmux-imx-core.h
>
> Name this pinctrl-* too for consistency.
>
> (...)
> > +#define IMX_PINCTRL_PIN(pin) PINCTRL_PIN(pin, #pin)
>
> Now I start to think about the range generators I discussed with
> Haojian... but there doesn't seem to be very many ranges in this driver
> so I guess it would only confuse things.
>
Yes, I was once also thinking about it when I first looked at the pinctrl,
one concern is that we have to use the id for pin group defines,
So not sure if it's suitable to generate pin id dynamically.
> > +#define IMX_PIN_GROUP(n, p, m) \
> > + { \
> > + .name = n, \
> > + .pins = p, \
> > + .num_pins = ARRAY_SIZE(p), \
> > + .mux_mode = m, \
> > + .num_mux = ARRAY_SIZE(m), \
> > + }
> > +
> > +#define IMX_PMX_FUNC(n, g) \
> > + { \
> > + .name = n, \
> > + .groups = g, \
> > + .num_groups = ARRAY_SIZE(g), \
> > + }
>
> This looks pretty smart!
>
> > +++ b/drivers/pinctrl/pinmux-imx53.c
>
> Name this pinctrl-*
>
> > diff --git a/drivers/pinctrl/pinmux-imx6q.c
> > b/drivers/pinctrl/pinmux-imx6q.c
>
> This too.
>
> This patch is overall very good, we're quickly approaching merge quality.
>
Will fix them all.
Thanks for the review.
Regards
Dong Aisheng
> Yours,
> Linus Walleij
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