Re: [PATCH 2/5] regmap: Expose regmap_writeable function to check if a register is writable

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To: chengwei <foxfly.lai.tw@xxxxxxxxx>
Subject: Re: [PATCH 2/5] regmap: Expose regmap_writeable function to check if a register is writable
From: Mark Brown <broonie@xxxxxxxxxx>
Date: Wed, 19 Oct 2022 12:57:37 +0100
Cc: lee@xxxxxxxxxx, rafael@xxxxxxxxxx, mika.westerberg@xxxxxxxxxxxxxxx, andriy.shevchenko@xxxxxxxxxxxxxxx, linus.walleij@xxxxxxxxxx, brgl@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, lenb@xxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-gpio@xxxxxxxxxxxxxxx, GaryWang@xxxxxxxxxxxx, musa.lin@xxxxxxxxxxxxxxx, jack.chang@xxxxxxxxxxxxxxx, chengwei <larry.lai@xxxxxxxxxxxxxxx>, Nicola Lunghi <nicola.lunghi@xxxxxxxxxx>
In-reply-to: <20221019022450.16851-3-larry.lai@yunjingtech.com>
Mail-followup-to: chengwei <foxfly.lai.tw@xxxxxxxxx>, lee@xxxxxxxxxx, rafael@xxxxxxxxxx, mika.westerberg@xxxxxxxxxxxxxxx, andriy.shevchenko@xxxxxxxxxxxxxxx, linus.walleij@xxxxxxxxxx, brgl@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, lenb@xxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-gpio@xxxxxxxxxxxxxxx, GaryWang@xxxxxxxxxxxx, musa.lin@xxxxxxxxxxxxxxx, jack.chang@xxxxxxxxxxxxxxx, chengwei <larry.lai@xxxxxxxxxxxxxxx>, Nicola Lunghi <nicola.lunghi@xxxxxxxxxx>
References: <20221019022450.16851-1-larry.lai@yunjingtech.com> <20221019022450.16851-3-larry.lai@yunjingtech.com>

On Wed, Oct 19, 2022 at 10:24:47AM +0800, chengwei wrote:

> Expose the regmap_writeable function for pinctrl-upboard reference.

Why?  A driver should understand the register map of the device it is
controlling.

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References:
- [PATCH 0/5] Add support control UP board CPLD/FPGA pin control
  - From: chengwei
- [PATCH 2/5] regmap: Expose regmap_writeable function to check if a register is writable
  - From: chengwei

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