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Message-Id: <79C789B5-345A-44F0-B81E-A0FB7E64235B@gmail.com>
Date: Thu, 9 Nov 2023 20:33:25 +0800
From: Mining Lin <mimi05633@...il.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: avifishman70@...il.com, tmaimon77@...il.com, tali.perry1@...il.com,
venture@...gle.com, yuenn@...gle.com, benjaminfair@...gle.com,
a.zummo@...ertech.it, KWLIU@...oton.com, JJLIU0@...oton.com,
KFLIN@...oton.com, mylin1@...oton.com, openbmc@...ts.ozlabs.org,
linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/1] rtc: nuvoton: Compatible with NCT3015Y-R and NCT3018Y-R
Dear Alexandre,
I will add change log next patch.
Thanks.
Best regard,
Mia
Sent from my iPhone
> On Nov 4, 2023, at 7:17 AM, Alexandre Belloni <alexandre.belloni@...tlin.com> wrote:
>
> On 04/11/2023 00:16:40+0100, Alexandre Belloni wrote:
>>> On 13/09/2023 09:37:19+0800, Mia Lin wrote:
>>> The NCT3015Y-R and NCT3018Y-R use the same datasheet
>>> but have different topologies as follows.
>>> - Topology (Only 1st i2c can set TWO bit and HF bit)
>>> In NCT3015Y-R,
>>> rtc 1st i2c is connected to a host CPU
>>> rtc 2nd i2c is connected to a BMC
>>> In NCT3018Y-R,
>>> rtc 1st i2c is connected to a BMC
>>> rtc 2nd i2c is connected to a host CPU
>>> In order to be compatible with NCT3015Y-R and NCT3018Y-R,
>>> - In probe,
>>> If part number is NCT3018Y-R, only set HF bit to 24-Hour format.
>>> Else, do nothing
>>> - In set_time,
>>> If part number is NCT3018Y-R && TWO bit is 0,
>>> change TWO bit to 1, and restore TWO bit after updating time.
>>>
>>> Signed-off-by: Mia Lin <mimi05633@...il.com>
>>> ---
>
> I forgot to add, please include a changelog here, this will make my
> reviews easier (and faster).
>
>>> drivers/rtc/rtc-nct3018y.c | 52 +++++++++++++++++++++++++++++++++-----
>>> 1 file changed, 46 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/rtc/rtc-nct3018y.c b/drivers/rtc/rtc-nct3018y.c
>>> index ed4e606be8e5..b006b58e15e2 100644
>>> --- a/drivers/rtc/rtc-nct3018y.c
>>> +++ b/drivers/rtc/rtc-nct3018y.c
>>> @@ -23,6 +23,7 @@
>>> #define NCT3018Y_REG_CTRL 0x0A /* timer control */
>>> #define NCT3018Y_REG_ST 0x0B /* status */
>>> #define NCT3018Y_REG_CLKO 0x0C /* clock out */
>>> +#define NCT3018Y_REG_PART 0x21 /* part info */
>>>
>>> #define NCT3018Y_BIT_AF BIT(7)
>>> #define NCT3018Y_BIT_ST BIT(7)
>>> @@ -37,10 +38,12 @@
>>> #define NCT3018Y_REG_BAT_MASK 0x07
>>> #define NCT3018Y_REG_CLKO_F_MASK 0x03 /* frequenc mask */
>>> #define NCT3018Y_REG_CLKO_CKE 0x80 /* clock out enabled */
>>> +#define NCT3018Y_REG_PART_NCT3018Y 0x02
>>>
>>> struct nct3018y {
>>> struct rtc_device *rtc;
>>> struct i2c_client *client;
>>> + int part_num;
>>> #ifdef CONFIG_COMMON_CLK
>>> struct clk_hw clkout_hw;
>>> #endif
>>> @@ -177,8 +180,27 @@ static int nct3018y_rtc_read_time(struct device *dev, struct rtc_time *tm)
>>> static int nct3018y_rtc_set_time(struct device *dev, struct rtc_time *tm)
>>> {
>>> struct i2c_client *client = to_i2c_client(dev);
>>> + struct nct3018y *nct3018y = dev_get_drvdata(dev);
>>> unsigned char buf[4] = {0};
>>> - int err;
>>> + int err, flags;
>>> + int restore_flags = 0;
>>> +
>>> + flags = i2c_smbus_read_byte_data(client, NCT3018Y_REG_CTRL);
>>> + if (flags < 0) {
>>> + dev_dbg(&client->dev, "Failed to read NCT3018Y_REG_CTRL.\n");
>>> + return flags;
>>> + }
>>> +
>>> + /* Check and set TWO bit */
>>> + if ((nct3018y->part_num & NCT3018Y_REG_PART_NCT3018Y) && !(flags & NCT3018Y_BIT_TWO)) {
>>> + restore_flags = 1;
>>> + flags |= NCT3018Y_BIT_TWO;
>>> + err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
>>> + if (err < 0) {
>>> + dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL.\n");
>>> + return err;
>>> + }
>>> + }
>>>
>>> buf[0] = bin2bcd(tm->tm_sec);
>>> err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_SC, buf[0]);
>>> @@ -212,6 +234,18 @@ static int nct3018y_rtc_set_time(struct device *dev, struct rtc_time *tm)
>>> return -EIO;
>>> }
>>>
>>> + /* Restore TWO bit */
>>> + if (restore_flags) {
>>> + if (nct3018y->part_num & NCT3018Y_REG_PART_NCT3018Y)
>>> + flags &= ~NCT3018Y_BIT_TWO;
>>> +
>>> + err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
>>> + if (err < 0) {
>>> + dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL.\n");
>>> + return err;
>>> + }
>>> + }
>>> +
>>> return err;
>>> }
>>>
>>> @@ -479,11 +513,17 @@ static int nct3018y_probe(struct i2c_client *client)
>>> dev_dbg(&client->dev, "%s: NCT3018Y_BIT_TWO is set\n", __func__);
>>> }
>>>
>>> - flags = NCT3018Y_BIT_TWO;
>>> - err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
>>> - if (err < 0) {
>>> - dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL\n");
>>> - return err;
>>> + nct3018y->part_num = i2c_smbus_read_byte_data(client, NCT3018Y_REG_PART);
>>> + if (nct3018y->part_num < 0) {
>>> + dev_dbg(&client->dev, "Failed to read NCT3018Y_REG_PART.\n");
>>> + return nct3018y->part_num;
>>> + } else if (nct3018y->part_num & NCT3018Y_REG_PART_NCT3018Y) {
>>
>> This is a weird way to check as this will accept any value of
>> NCT3018Y_REG_PART as long as bit 1 is set, is this really what you want?
>>
>>> + flags = NCT3018Y_BIT_HF;
>>> + err = i2c_smbus_write_byte_data(client, NCT3018Y_REG_CTRL, flags);
>>> + if (err < 0) {
>>> + dev_dbg(&client->dev, "Unable to write NCT3018Y_REG_CTRL.\n");
>>> + return err;
>>> + }
>>> }
>>>
>>> flags = 0;
>>> --
>>> 2.17.1
>>>
>>
>> --
>> Alexandre Belloni, co-owner and COO, Bootlin
>> Embedded Linux and Kernel engineering
>> https://bootlin.com
>
> --
> Alexandre Belloni, co-owner and COO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
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