netdev - Re: [RFC PATCH 10/15] pwrseq: add support for QCA BT+WiFi power sequencer

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Message-ID: <YR7m43mURVJ8YufC@ripper>
Date:   Thu, 19 Aug 2021 16:18:59 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        linux-arm-msm@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [RFC PATCH 10/15] pwrseq: add support for QCA BT+WiFi power
 sequencer

On Mon 16 Aug 17:55 PDT 2021, Dmitry Baryshkov wrote:
[..]
> diff --git a/drivers/power/pwrseq/pwrseq_qca.c b/drivers/power/pwrseq/pwrseq_qca.c
> new file mode 100644
> index 000000000000..3421a4821126
> --- /dev/null
> +++ b/drivers/power/pwrseq/pwrseq_qca.c
> @@ -0,0 +1,290 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2021, Linaro Ltd.
> + *
> + * Author: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> + *
> + * Power Sequencer for Qualcomm WiFi + BT SoCs
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/platform_device.h>
> +#include <linux/pwrseq/driver.h>
> +#include <linux/regulator/consumer.h>
> +
> +/*
> + * Voltage regulator information required for configuring the
> + * QCA WiFi+Bluetooth chipset
> + */
> +struct qca_vreg {
> +	const char *name;
> +	unsigned int load_uA;
> +};
> +
> +struct qca_device_data {
> +	struct qca_vreg vddio;

Any particular reason why this isn't just the first entry in vregs and
operated as part of the bulk API?

> +	struct qca_vreg *vregs;
> +	size_t num_vregs;
> +	bool has_bt_en;
> +	bool has_wifi_en;
> +};
> +
> +struct pwrseq_qca;
> +struct pwrseq_qca_one {
> +	struct pwrseq_qca *common;
> +	struct gpio_desc *enable;
> +};
> +
> +#define PWRSEQ_QCA_WIFI 0
> +#define PWRSEQ_QCA_BT 1
> +
> +#define PWRSEQ_QCA_MAX 2
> +
> +struct pwrseq_qca {
> +	struct regulator *vddio;
> +	struct gpio_desc *sw_ctrl;
> +	struct pwrseq_qca_one pwrseq_qcas[PWRSEQ_QCA_MAX];
> +	int num_vregs;
> +	struct regulator_bulk_data vregs[];
> +};
> +
> +static int pwrseq_qca_power_on(struct pwrseq *pwrseq)
> +{
> +	struct pwrseq_qca_one *qca_one = pwrseq_get_data(pwrseq);
> +	int ret;
> +
> +	if (qca_one->common->vddio) {

devm_regulator_get() doesn't return NULL, so this is always true.

> +		ret = regulator_enable(qca_one->common->vddio);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = regulator_bulk_enable(qca_one->common->num_vregs, qca_one->common->vregs);
> +	if (ret)
> +		goto vddio_off;
> +
> +	if (qca_one->enable) {
> +		gpiod_set_value_cansleep(qca_one->enable, 0);
> +		msleep(50);
> +		gpiod_set_value_cansleep(qca_one->enable, 1);
> +		msleep(150);
> +	}
> +
> +	if (qca_one->common->sw_ctrl) {
> +		bool sw_ctrl_state = gpiod_get_value_cansleep(qca_one->common->sw_ctrl);
> +		dev_dbg(&pwrseq->dev, "SW_CTRL is %d", sw_ctrl_state);
> +	}
> +
> +	return 0;
> +
> +vddio_off:
> +	regulator_disable(qca_one->common->vddio);
> +
> +	return ret;
> +}
[..]
> +static int pwrseq_qca_probe(struct platform_device *pdev)
> +{
> +	struct pwrseq_qca *pwrseq_qca;
> +	struct pwrseq *pwrseq;
> +	struct pwrseq_provider *provider;
> +	struct device *dev = &pdev->dev;
> +	struct pwrseq_onecell_data *onecell;
> +	const struct qca_device_data *data;
> +	int ret, i;
> +
> +	data = device_get_match_data(dev);
> +	if (!data)
> +		return -EINVAL;
> +
> +	pwrseq_qca = devm_kzalloc(dev, struct_size(pwrseq_qca, vregs, data->num_vregs), GFP_KERNEL);
> +	if (!pwrseq_qca)
> +		return -ENOMEM;
> +
> +	onecell = devm_kzalloc(dev, struct_size(onecell, pwrseqs, PWRSEQ_QCA_MAX), GFP_KERNEL);
> +	if (!onecell)
> +		return -ENOMEM;
> +
> +	ret = pwrseq_qca_regulators_init(dev, pwrseq_qca, data);
> +	if (ret)
> +		return ret;
> +
> +	if (data->has_wifi_en) {
> +		pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_WIFI].enable = devm_gpiod_get(dev, "wifi-enable", GPIOD_OUT_LOW);
> +		if (IS_ERR(pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_WIFI].enable)) {
> +			return dev_err_probe(dev, PTR_ERR(pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_WIFI].enable),
> +					"failed to acquire WIFI enable GPIO\n");
> +		}
> +	}
> +
> +	if (data->has_bt_en) {
> +		pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_BT].enable = devm_gpiod_get(dev, "bt-enable", GPIOD_OUT_LOW);
> +		if (IS_ERR(pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_BT].enable)) {
> +			return dev_err_probe(dev, PTR_ERR(pwrseq_qca->pwrseq_qcas[PWRSEQ_QCA_BT].enable),
> +					"failed to acquire BT enable GPIO\n");
> +		}
> +	}
> +
> +	pwrseq_qca->sw_ctrl = devm_gpiod_get_optional(dev, "swctrl", GPIOD_IN);
> +	if (IS_ERR(pwrseq_qca->sw_ctrl)) {
> +		return dev_err_probe(dev, PTR_ERR(pwrseq_qca->sw_ctrl),
> +				"failed to acquire SW_CTRL gpio\n");
> +	} else if (!pwrseq_qca->sw_ctrl)
> +		dev_info(dev, "No SW_CTRL gpio\n");

Some {} around the else as well please.

Regards,
Bjorn