Re: [PATCH 4/8] pinctrl: qcom: sdm845: Provide ACPI support

Bjorn Andersson
2019-06-05T06:16:43Z

On Tue 04 Jun 03:44 PDT 2019, Lee Jones wrote:

> This patch provides basic support for booting with ACPI instead
> of the currently supported Device Tree. When doing so there are a
> couple of differences which we need to taken into consideration.
>
> Firstly, the SDM850 ACPI tables omit information pertaining to the
> 4 reserved GPIOs on the platform. If Linux attempts to touch/
> initialise any of these lines, the firmware will restart the
> platform.
>
> Secondly, when booting with ACPI, it is expected that the firmware
> will set-up things like; Regulators, Clocks, Pin Functions, etc in
> their ideal configuration. Thus, the possible Pin Functions
> available to this platform are not advertised when providing the
> higher GPIOD/Pinctrl APIs with pin information.
>
> Signed-off-by: Lee Jones <lee.jones@linaro.org>
> ---
> drivers/pinctrl/qcom/Kconfig | 2 +-
> drivers/pinctrl/qcom/pinctrl-sdm845.c | 35 ++++++++++++++++++++++++++-
> 2 files changed, 35 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pinctrl/qcom/Kconfig b/drivers/pinctrl/qcom/Kconfig
> index 2e66ab72c10b..aafbe932424f 100644
> --- a/drivers/pinctrl/qcom/Kconfig
> +++ b/drivers/pinctrl/qcom/Kconfig
> @@ -168,7 +168,7 @@ config PINCTRL_SDM660
>
> config PINCTRL_SDM845
> tristate "Qualcomm Technologies Inc SDM845 pin controller driver"
> - depends on GPIOLIB && OF
> + depends on GPIOLIB && (OF || ACPI)
> select PINCTRL_MSM
> help
> This is the pinctrl, pinmux, pinconf and gpiolib driver for the
> diff --git a/drivers/pinctrl/qcom/pinctrl-sdm845.c b/drivers/pinctrl/qcom/pinctrl-sdm845.c
> index c97f20fca5fd..7188bee3cf3e 100644
> --- a/drivers/pinctrl/qcom/pinctrl-sdm845.c
> +++ b/drivers/pinctrl/qcom/pinctrl-sdm845.c
> @@ -3,6 +3,7 @@
> * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
> */
>
> +#include <linux/acpi.h>
> #include <linux/module.h>
> #include <linux/of.h>
> #include <linux/platform_device.h>
> @@ -1277,6 +1278,10 @@ static const struct msm_pingroup sdm845_groups[] = {
> UFS_RESET(ufs_reset, 0x99f000),
> };
>
> +static const int sdm845_acpi_reserved_gpios[] = {
> + 0, 1, 2, 3, 81, 82, 83, 84, -1
> +};
> +
> static const struct msm_pinctrl_soc_data sdm845_pinctrl = {
> .pins = sdm845_pins,
> .npins = ARRAY_SIZE(sdm845_pins),
> @@ -1284,14 +1289,41 @@ static const struct msm_pinctrl_soc_data sdm845_pinctrl = {
> .nfunctions = ARRAY_SIZE(sdm845_functions),
> .groups = sdm845_groups,
> .ngroups = ARRAY_SIZE(sdm845_groups),
> + .reserved_gpios = sdm845_acpi_reserved_gpios,

The reason why put these in DT is because the list is board/firmware
dependent. E.g. the firmware on db845c does not support the peripherals
that sits on these 8 pins and as such these are not reserved.

But given that the two structs looks identical now, did you perhaps not
intend to add.reserved_gpios for the non-ACPI case?

Regards,
Bjorn

> + .ngpios = 150,
> +};
> +
> +static const struct msm_pinctrl_soc_data sdm845_acpi_pinctrl = {
> + .pins = sdm845_pins,
> + .npins = ARRAY_SIZE(sdm845_pins),
> + .groups = sdm845_groups,
> + .ngroups = ARRAY_SIZE(sdm845_groups),
> + .reserved_gpios = sdm845_acpi_reserved_gpios,
> .ngpios = 150,
> };
>
> static int sdm845_pinctrl_probe(struct platform_device *pdev)
> {
> - return msm_pinctrl_probe(pdev, &sdm845_pinctrl);
> + int ret;
> +
> + if (pdev->dev.of_node) {
> + ret = msm_pinctrl_probe(pdev, &sdm845_pinctrl);
> + } else if (ACPI_HANDLE(&pdev->dev)) {
> + ret = msm_pinctrl_probe(pdev, &sdm845_acpi_pinctrl);
> + } else {
> + dev_err(&pdev->dev, "DT and ACPI disabled\n");
> + return -EINVAL;
> + }
> +
> + return ret;
> }
>
> +static const struct acpi_device_id sdm845_pinctrl_acpi_match[] = {
> + { "QCOM0217"},
> + { },
> +};
> +MODULE_DEVICE_TABLE(acpi, sdm845_pinctrl_acpi_match);
> +
> static const struct of_device_id sdm845_pinctrl_of_match[] = {
> { .compatible = "qcom,sdm845-pinctrl", },
> { },
> @@ -1302,6 +1334,7 @@ static struct platform_driver sdm845_pinctrl_driver = {
> .name = "sdm845-pinctrl",
> .pm = &msm_pinctrl_dev_pm_ops,
> .of_match_table = sdm845_pinctrl_of_match,
> + .acpi_match_table = ACPI_PTR(sdm845_pinctrl_acpi_match),
> },
> .probe = sdm845_pinctrl_probe,
> .remove = msm_pinctrl_remove,
> --
> 2.17.1
>