linux-kernel - Re: [PATCH v9 2/4] input: pm8xxx-vibrator: refactor to support new SPMI vibrator

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Message-ID: <fa6c8b30-11f3-bd80-67cb-713e4348eccf@quicinc.com>
Date: Thu, 11 Apr 2024 21:43:59 +0800
From: Fenglin Wu <quic_fenglinw@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <kernel@...cinc.com>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "Dmitry
 Torokhov" <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-input@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v9 2/4] input: pm8xxx-vibrator: refactor to support new
 SPMI vibrator



On 2024/4/11 18:58, Dmitry Baryshkov wrote:
> On Thu, 11 Apr 2024 at 11:32, Fenglin Wu via B4 Relay
> <devnull+quic_fenglinw.quicinc.com@...nel.org> wrote:
>>
>> From: Fenglin Wu <quic_fenglinw@...cinc.com>
>>
>> Currently, vibrator control register addresses are hard coded,
>> including the base address and offsets, it's not flexible to
>> support new SPMI vibrator module which is usually included in
>> different PMICs with different base address. Refactor it by using
>> the base address defined in devicetree.
>>
>> Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
>> ---
>>   drivers/input/misc/pm8xxx-vibrator.c | 42 ++++++++++++++++++++++++------------
>>   1 file changed, 28 insertions(+), 14 deletions(-)
>>
>> diff --git a/drivers/input/misc/pm8xxx-vibrator.c b/drivers/input/misc/pm8xxx-vibrator.c
>> index 89f0f1c810d8..2959edca8eb9 100644
>> --- a/drivers/input/misc/pm8xxx-vibrator.c
>> +++ b/drivers/input/misc/pm8xxx-vibrator.c
>> @@ -20,26 +20,26 @@
>>   #define MAX_FF_SPEED           0xff
>>
>>   struct pm8xxx_regs {
>> -       unsigned int enable_addr;
>> +       unsigned int enable_offset;
>>          unsigned int enable_mask;
>>
>> -       unsigned int drv_addr;
>> +       unsigned int drv_offset;
>>          unsigned int drv_mask;
>>          unsigned int drv_shift;
>>          unsigned int drv_en_manual_mask;
>>   };
>>
>>   static const struct pm8xxx_regs pm8058_regs = {
>> -       .drv_addr = 0x4A,
>> +       .drv_offset = 0x4A,
> 
> If the DT already has reg = <0x4a> and you add drv_offset = 0x4a,
> which register will be used by the driver?
> 
> Also, while we are at it, please downcase all the hex numbers that you
> are touching.
> 
For SSBI vibrator, the "reg" value defined in DT is not used, see below.


>>          .drv_mask = 0xf8,
>>          .drv_shift = 3,
>>          .drv_en_manual_mask = 0xfc,
>>   };
>>
>>   static struct pm8xxx_regs pm8916_regs = {
>> -       .enable_addr = 0xc046,
>> +       .enable_offset = 0x46,

[...]

>> @@ -170,7 +173,7 @@ static int pm8xxx_vib_probe(struct platform_device *pdev)
>>          struct pm8xxx_vib *vib;
>>          struct input_dev *input_dev;
>>          int error;
>> -       unsigned int val;
>> +       unsigned int val, reg_base = 0;
>>          const struct pm8xxx_regs *regs;
>>
>>          vib = devm_kzalloc(&pdev->dev, sizeof(*vib), GFP_KERNEL);
>> @@ -190,13 +193,24 @@ static int pm8xxx_vib_probe(struct platform_device *pdev)
>>
>>          regs = of_device_get_match_data(&pdev->dev);
>>
>> +       if (regs->enable_offset != 0) {
>> +               error = fwnode_property_read_u32(pdev->dev.fwnode, "reg", &reg_base);
>> +               if (error < 0) {
>> +                       dev_err(&pdev->dev, "Failed to read reg address, rc=%d\n", error);
>> +                       return error;
>> +               }
>> +       }
>> +
>> +       vib->enable_addr = reg_base + regs->enable_offset;
>> +       vib->drv_addr = reg_base + regs->drv_offset;

The reg_base is initialized as 0 and it is assigned as the "reg" value 
defined in DT only for SPMI vibrators.

>> +
>>          /* operate in manual mode */
>> -       error = regmap_read(vib->regmap, regs->drv_addr, &val);
>> +       error = regmap_read(vib->regmap, vib->drv_addr, &val);
>>          if (error < 0)
>>                  return error;
>>
>>          val &= regs->drv_en_manual_mask;
>> -       error = regmap_write(vib->regmap, regs->drv_addr, val);
>> +       error = regmap_write(vib->regmap, vib->drv_addr, val);
>>          if (error < 0)
>>                  return error;
>>
>>
>> --
>> 2.25.1
>>
>>
> 
>