linux-kernel - [PATCH v4 0/2] Add support for TI TPS65219 PMIC GPIO interface.

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Message-Id: <20230511-tps65219-add-gpio-support-v4-0-b5d6a764d722@baylibre.com>
Date:   Tue, 30 May 2023 09:59:58 +0200
From:   Jerome Neanne <jneanne@...libre.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Tony Lindgren <tony@...mide.com>, Lee Jones <lee@...nel.org>
Cc:     khilman@...libre.com, msp@...libre.com, francesco@...cini.it,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-omap@...r.kernel.org,
        Jonathan Cormier <jcormier@...ticallink.com>,
        Jerome Neanne <jneanne@...libre.com>
Subject: [PATCH v4 0/2] Add support for TI TPS65219 PMIC GPIO interface.

Changes in v4:
- andy.shevchenko review:
	- Nits:
		- move blank line before link in this cover.
		- Kconfig indentation.
		- Formatting: Comments; indentation; line length 100.
		- Do not split string literals.
	- Add var *dev = gpio->tps->dev and replace to get shorter blocks.
	- Evaluate GPIO0 MULTI_DEVICE_ENABLE only once.
	- Explicit include of bits.h
Change to CONFIG_DEBUG_GPIO: debug options from Kconfig for GPIO only.

- Link to v3: https://lore.kernel.org/r/20230511-tps65219-add-gpio-support-v3-0-19837a34d820@baylibre.com
GPIO interface consist in 3 pins:
Two GPIOS are output only: GPO1, GPO2.

GPIO0 is used for multi device support:
- The input-functionality is only used in multi-PMIC configuration
- In single-PMIC, it can be used as an output

The configuration is static and flashed in NVM in factory.
Description tps65219.pdf chapter 7.3.13

Linux must not change MULTI_DEVICE_ENABLE bit at run time.

This was done for test purpose only to check input/output
correct behavior on EVM board (no access to different NVM config).

Tested on k3-am62x-lp-sk board. This board MULTI_DEVICE_ENABLE=0

Despite the register bits are out of order,
driver is remapping in natural order:
GPIO0 is gpiochip line 0
GPO1/2 are gpiochip line 1/2

Initial version by Jon Cormier on TI Mainline.
Ported upstream by Jerome Neanne

PMIC datasheet:

Link: https://www.ti.com/lit/ds/symlink/tps65219.pdf
Changes in v3:
- Linus Walleij Review:
	- put test code under IS_ENABLED(DEBUG)
- Bartosz Golaszewski Review:
	- nits: alphabetical ordering for includes, newline after
	  return, 
	- Add error message on regmap_update_bits failure.
	- Change variable name in: tps65219_template_chip so that it's
	  clear that gpio_chip get's a copy of this template structure.

- Link to v2: https://lore.kernel.org/r/20230511-tps65219-add-gpio-support-v2-0-60feb64d649a@baylibre.com
Changes in v2:
andy.shevchenko review:
	- Typo and indentation in commit message.
	- Clarify Co-developer role.
	- Specify name for module.
	- Code simplification for tps65219_gpio_set
	- Put test code into #if 0 ... #endif to make it easier to re-use
	- Formatting for .driver
	- remove dupplicated error management => dead code

- Link to v1: https://lore.kernel.org/all/20230224113837.874264-1-jneanne@baylibre.com/

Co-developed-by: Jonathan Cormier <jcormier@...ticallink.com>
Signed-off-by: Jonathan Cormier <jcormier@...ticallink.com>
Signed-off-by: Jerome Neanne <jneanne@...libre.com>

Jerome Neanne (2):
  gpio: tps65219: add GPIO support for TPS65219 PMIC
  mfd: tps65219: Add gpio cell instance

 MAINTAINERS                  |   1 +
 drivers/gpio/Kconfig         |  13 +++
 drivers/gpio/Makefile        |   1 +
 drivers/gpio/gpio-tps65219.c | 167 +++++++++++++++++++++++++++++++++++
 drivers/mfd/tps65219.c       |   7 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpio/gpio-tps65219.c

--
2.34.1

---
Jerome Neanne (2):
      gpio: tps65219: add GPIO support for TPS65219 PMIC
      mfd: tps65219: Add gpio cell instance

 MAINTAINERS                  |   1 +
 drivers/gpio/Kconfig         |  15 ++++
 drivers/gpio/Makefile        |   1 +
 drivers/gpio/gpio-tps65219.c | 181 +++++++++++++++++++++++++++++++++++++++++++
 drivers/mfd/tps65219.c       |   2 +-
 5 files changed, 199 insertions(+), 1 deletion(-)
---
base-commit: 8ded96e4d9a6da88bdbad61350cc6147b7c0c00c
change-id: 20230511-tps65219-add-gpio-support-322bdb4e0297

Best regards,
-- 
Jerome Neanne <jneanne@...libre.com>