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Message-ID: <CAFp+6iFJ5us7e9wY0USiDYn4XyNsxgLF9GhVYQFM9OY0qnxU_w@mail.gmail.com>
Date: Wed, 26 Dec 2012 17:37:10 +0530
From: Vivek Gautam <gautamvivek1987@...il.com>
To: Doug Anderson <dianders@...omium.org>
Cc: Vivek Gautam <gautam.vivek@...sung.com>, l.majewski@...sung.com,
linux-samsung-soc@...r.kernel.org,
Praveen Paneri <p.paneri@...sung.com>,
gregkh@...uxfoundation.org, devicetree-discuss@...ts.ozlabs.org,
linux-usb@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
balbi@...com, kyungmin.park@...sung.com,
Kukjin Kim <kgene.kim@...sung.com>,
Ben Dooks <ben-linux@...ff.org>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] usb: phy: samsung: Add support to set pmu isolation
Hi Doug,
On Fri, Dec 21, 2012 at 10:35 PM, Doug Anderson <dianders@...omium.org> wrote:
> Vivek,
>
> Nothing really serious below and things look good to me, but figured
> I'd put a few nits in (sorry!).
>
>
> On Fri, Dec 21, 2012 at 12:16 AM, Vivek Gautam <gautam.vivek@...sung.com> wrote:
>> diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
>> index 7b26e2d..09f06f8 100644
>> --- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
>> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
>> @@ -9,3 +9,31 @@ Required properties:
>> - compatible : should be "samsung,exynos4210-usbphy"
>> - reg : base physical address of the phy registers and length of memory mapped
>> region.
>> +- #address-cells: should be 1.
>> +- #size-cells: should be 0.
>
> Doesn't match your example. Probably should be 1.
Oops !! true it is 1, will amend this.
>
>> diff --git a/drivers/usb/phy/samsung-usbphy.c b/drivers/usb/phy/samsung-usbphy.c
>> index 5c5e1bb5..2260029 100644
>> --- a/drivers/usb/phy/samsung-usbphy.c
>> +++ b/drivers/usb/phy/samsung-usbphy.c
>> /*
>> + * struct samsung_usbphy_drvdata - driver data for various SoC variants
>> + * @cpu_type: machine identifier
>> + * @devphy_en_mask: device phy enable mask for PHY CONTROL register
>> + * @hostphy_en_mask: host phy enable mask for PHY CONTROL register
>> + *
>> + * having different mask for host and device type phy
>> + * helps in setting independent masks in case of SoCs like
>> + * S5PV210 in which PHY0 and PHY1 enable bits belong to same
>> + * register placed at [0] and [1] respectively.
>> + * Although for newer SoCs like exynos these bits belong to
>> + * different registers altogether placed at [0].
>> + */
>> +struct samsung_usbphy_drvdata {
>> + int cpu_type;
>> + int devphy_en_mask;
>
> This is really a "devphy_dis_mask", isn't it? AKA: setting to 1
> disables the phy and setting to 0 enables the phy.
This is actually 'devphy_en_mask' only. We use it this way:
When pmu_isolation is true, meaning usbphy is isolated from pmu
so we are resetting this bit to disable usbphy, as there in
samsung_usbphy_set_isolation().
>
>> + int hostphy_en_mask;
>
> Code below always uses devphy and only ever inits devphy. I assume
> future code will init / use hostphy? Worth moving the hostphy part in
> that patch?
>
Sure will move this in forthcoming patch for host phy.
>> struct samsung_usbphy {
>> struct usb_phy phy;
>> @@ -81,12 +104,66 @@ struct samsung_usbphy {
>> struct device *dev;
>> struct clk *clk;
>> void __iomem *regs;
>> + void __iomem *phyctrl_pmureg;
>> int ref_clk_freq;
>> - int cpu_type;
>> + struct samsung_usbphy_drvdata *drv_data;
>
> nit: const
Will make it const.
>
>> +static int samsung_usbphy_parse_dt_param(struct samsung_usbphy *sphy)
>> +{
>> + struct device_node *usbphy_pmu;
>> + u32 reg[2];
>> + int ret;
>> +
>> + if (!sphy->dev->of_node) {
>> + dev_err(sphy->dev, "Can't get usb-phy node\n");
>> + return -ENODEV;
>> + }
>> +
>> + usbphy_pmu = of_get_child_by_name(sphy->dev->of_node, "usbphy-pmu");
>> + if (!usbphy_pmu)
>> + dev_warn(sphy->dev, "Can't get usb-phy pmu control node\n");
>> +
>> + ret = of_property_read_u32_array(usbphy_pmu, "reg", reg, 2);
>
> nit: use ARRAY_SIZE(reg)
>
Sure will amend this.
>> + if (!ret)
>> + sphy->phyctrl_pmureg = ioremap(reg[0], reg[1]);
>> +
>> + of_node_put(usbphy_pmu);
>> +
>> + if (IS_ERR_OR_NULL(sphy->phyctrl_pmureg)) {
>> + dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
>
> I don't think there's any cases where it matters (you'll error out of
> the driver if you return an error here), but seems like it might be
> nice to set sphy->phyctrl_pmureg to NULL here since other places test
> this member against NULL only.
>
Isn't devm_kzallocing the memory for sphy setting sphy->phyctrl_pmureg to NULL ?
Then, does checking here for IS_ERR_OR_NULL(sphy->phyctrl_pmureg) has
a problem ?
Probably i am not getting what is expected here. :-(
>> +static inline struct samsung_usbphy_drvdata
>> +*samsung_usbphy_get_driver_data(struct platform_device *pdev)
>> {
>> if (pdev->dev.of_node) {
>> const struct of_device_id *match;
>> match = of_match_node(samsung_usbphy_dt_match,
>> pdev->dev.of_node);
>> - return (int) match->data;
>> + return (struct samsung_usbphy_drvdata *) match->data;
>
> nit: no need for a cast here, I believe.
>
"samsung_usbphy_get_driver_data()" is returning (struct
samsung_usbphy_drvdata *)
and the data is actually (void *). So won't we need a cast here.
I am actually getting compile time warnings.
>> }
>>
>> - return platform_get_device_id(pdev)->driver_data;
>> + return ((struct samsung_usbphy_drvdata *)
>> + platform_get_device_id(pdev)->driver_data);
>
> nit: no need for a cast here, I believe.
>
ditto here, the driver data for non dt is (unsigned long). So ?
>> +static struct samsung_usbphy_drvdata usbphy_s3c64xx = {
>> + .cpu_type = TYPE_S3C64XX,
>> + .devphy_en_mask = S3C64XX_USBPHY_ENABLE,
>> +};
>> +
>> +static struct samsung_usbphy_drvdata usbphy_exynos4 = {
>> + .cpu_type = TYPE_EXYNOS4210,
>> + .devphy_en_mask = EXYNOS_USBPHY_ENABLE,
>> +};
>> +
>
> nit: static const for these structs?
Sure will make them const. no harm.
>
>
>
> -Doug
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/devicetree-discuss
--
Thanks & Regards
Vivek
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