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[88.153.139.166]) by smtp.gmail.com with ESMTPSA id s24sm1522757wmj.26.2021.12.14.01.50.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Dec 2021 01:50:59 -0800 (PST) From: Patrick Rudolph To: Peter Rosin Cc: Patrick Rudolph , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/4] i2c-mux-pca954x: Add regulator support Date: Tue, 14 Dec 2021 10:50:21 +0100 Message-Id: <20211214095021.572799-4-patrick.rudolph@9elements.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211214095021.572799-1-patrick.rudolph@9elements.com> References: <20211214095021.572799-1-patrick.rudolph@9elements.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add an optional vcc regulator and enable it when found for devices that are powered off by default. Signed-off-by: Patrick Rudolph --- drivers/i2c/muxes/i2c-mux-pca954x.c | 33 ++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-) diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c index 23e0f24bab04..5fa266cb02c0 100644 --- a/drivers/i2c/muxes/i2c-mux-pca954x.c +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c @@ -48,6 +48,7 @@ #include #include #include +#include #include #include #include @@ -101,6 +102,7 @@ struct pca954x { struct irq_domain *irq; unsigned int irq_mask; raw_spinlock_t lock; + struct regulator *supply; }; /* Provide specs for the PCA954x and MAX735x types we know about */ @@ -425,6 +427,9 @@ static void pca954x_cleanup(struct i2c_mux_core *muxc) struct pca954x *data = i2c_mux_priv(muxc); int c, irq; + if (!IS_ERR_OR_NULL(data->supply)) + regulator_disable(data->supply); + if (data->irq) { for (c = 0; c < data->chip->nchans; c++) { irq = irq_find_mapping(data->irq, c); @@ -484,15 +489,31 @@ static int pca954x_probe(struct i2c_client *client, pca954x_select_chan, pca954x_deselect_mux); if (!muxc) return -ENOMEM; + data = i2c_mux_priv(muxc); i2c_set_clientdata(client, muxc); data->client = client; + data->supply = devm_regulator_get(dev, "vcc"); + if (IS_ERR(data->supply)) { + if ((PTR_ERR(data->supply) == -EPROBE_DEFER)) + return -EPROBE_DEFER; + dev_warn(dev, "Failed to get regulator for vcc: %d\n", ret); + } else { + ret = regulator_enable(data->supply); + if (ret) { + dev_err(dev, "Failed to enable regulator vcc\n"); + return ret; + } + } + /* Reset the mux if a reset GPIO is specified. */ gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); - if (IS_ERR(gpio)) - return PTR_ERR(gpio); + if (IS_ERR(gpio)) { + ret = PTR_ERR(gpio); + goto fail_cleanup; + } if (gpio) { udelay(1); gpiod_set_value_cansleep(gpio, 0); @@ -509,7 +530,7 @@ static int pca954x_probe(struct i2c_client *client, ret = i2c_get_device_id(client, &id); if (ret && ret != -EOPNOTSUPP) - return ret; + goto fail_cleanup; if (!ret && (id.manufacturer_id != data->chip->id.manufacturer_id || @@ -517,7 +538,8 @@ static int pca954x_probe(struct i2c_client *client, dev_warn(dev, "unexpected device id %03x-%03x-%x\n", id.manufacturer_id, id.part_id, id.die_revision); - return -ENODEV; + ret = -ENODEV; + goto fail_cleanup; } } @@ -536,7 +558,8 @@ static int pca954x_probe(struct i2c_client *client, ret = pca954x_init(client, data); if (ret < 0) { dev_warn(dev, "probe failed\n"); - return -ENODEV; + ret = -ENODEV; + goto fail_cleanup; } ret = pca954x_irq_setup(muxc); -- 2.33.1