linux-kernel - Re: [PATCH v1 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY

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Date:   Tue, 20 Aug 2019 11:10:15 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     kishon@...com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com, peter.harliman.liem@...el.com
Subject: Re: [PATCH v1 2/2] phy: intel-lgm-emmc: Add support for eMMC PHY

On 20/8/2019 12:06 AM, Andy Shevchenko wrote:
> On Mon, Aug 19, 2019 at 11:44:16AM +0800, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>
>> Adds support for eMMC PHY on Intel's Lightning Mountain SoC.
> Adds -> Add.
Thanks Andy, agreed.
>> +/* eMMC phy register definitions */
>> +#define EMMC_PHYCTRL0_REG	0xa8
>> +#define DR_TY_MASK		GENMASK(30, 28)
>> +#define DR_TY_50OHM(x)		((~(x) << 28) & DR_TY_MASK)
>> +#define OTAPDLYENA		BIT(14)
>> +#define OTAPDLYSEL_MASK		GENMASK(13, 10)
>> +#define OTAPDLYSEL_SHIFT(x)	(((x) << 10) & OTAPDLYSEL_MASK)
>> +
>> +#define EMMC_PHYCTRL1_REG	0xac
>> +#define PDB_MASK		1
> BIT(0)
agreed.
>> +#define ENDLL_MASK		BIT(7)
>> +#define ENDLL_VAL		BIT(7)
>> +
>> +#define EMMC_PHYCTRL2_REG	0xb0
>> +#define FRQSEL_25M		0
>> +#define FRQSEL_150M		3
>> +#define FRQSEL_MASK		GENMASK(24, 22)
>> +#define FRQSEL_SHIFT(x)		((x) << 22)
>> +
>> +#define EMMC_PHYSTAT_REG	0xbc
>> +#define CALDONE_MASK		1
>> +#define DLLRDY_MASK		1
>> +#define IS_CALDONE(x)	((((x) >> 9) & CALDONE_MASK) == 1)
>> +#define IS_DLLRDY(x)	((((x) >> 8) & DLLRDY_MASK) == 1)
> These are inconsistent with above:
>
> 	#define CALDONE_MASK	BIT(9)
> 	...
> 	#define IS_CALDONE	((x) & CALDONE_MASK)
>
> Note redundant == part.
Agreed, will update.
>> +static int intel_emmc_phy_power(struct phy *phy, bool on_off)
>> +{
>> +	 * - PHY driver to probe
>> +	 * - SDHCI driver to start probe
>> +	 * - SDHCI driver to register it's clock
>> +	 * - SDHCI driver to get the PHY
>> +	 * - SDHCI driver to init the PHY
>> +	 *
>
>> +	 * The clock is optional, so upon any error we just set to NULL.
> No, the clock framework will do it for you.
>
>> +	 *
>> +	 * NOTE: we don't do anything special for EPROBE_DEFER here.  Given the
>> +	 * above expected use case, EPROBE_DEFER isn't sensible to expect, so
>> +	 * it's just like any other error.
> This comment is not correct...
Agreed, re-structure the sentence.
>> +	 */
>> +	priv->emmcclk = clk_get_optional(&phy->dev, "emmcclk");
>> +	if (IS_ERR(priv->emmcclk)) {
>> +		dev_warn(&phy->dev, "ERROR: getting emmcclk\n");
> ...because here you have to return an error...
Agreed.
>> +		priv->emmcclk = NULL;
> ...and here is redundant assignment.
>
Agreed.
>> +	}
>> +
>> +	return 0;
>> +}
> When you send out patches, check that you do this for latest version you got reviewed internally.
Thank you so much for the review comments, sure I will recheck and 
recollect your review comments of different patches
for  the same cases .

With Best Regards
vadivel