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SubjectRe: [PATCH 0/3] Migrate i8255 GPIO drivers to regmap API
On Thu, Nov 03, 2022 at 07:20:46AM -0400, William Breathitt Gray wrote:
> The regmap API supports IO port accessors so we can take advantage of
> regmap abstractions rather than handling access to the device registers
> directly in the driver.
>
> Precursor patches are provided for 104-dio-48e and 104-idi-48 to migrate
> their respective device-specific registers first in order to simplify
> the subsequent patch migrating the i8255 library and its dependents.
>
> The struct i8255 control_state member serves as a cache of the i8255
> device's control register. Does the regmap API support caching such that
> we won't need to manually update a control_state member?

Yes, regmap supports caching and IIRC it's opt-out.

> William Breathitt Gray (3):
> gpio: 104-dio-48e: Migrate to regmap API
> gpio: 104-idi-48: Migrate to regmap API
> gpio: i8255: Migrate to regmap API
>
> drivers/gpio/gpio-104-dio-48e.c | 200 +++++++++++++++++++----------
> drivers/gpio/gpio-104-idi-48.c | 110 +++++++++++-----
> drivers/gpio/gpio-gpio-mm.c | 97 ++++++++++----
> drivers/gpio/gpio-i8255.c | 218 +++++++++++++++++++++-----------
> drivers/gpio/gpio-i8255.h | 54 ++++----
> 5 files changed, 451 insertions(+), 228 deletions(-)
>
>
> base-commit: b8b80348c57b360019071e17380298619c5d8066
> --
> 2.37.3
>

--
With Best Regards,
Andy Shevchenko


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