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Tue, 7 Sep 2021 23:40:22 -0400 (EDT) From: Samuel Holland To: Dmitry Torokhov , Hans de Goede , Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec Cc: Philipp Zabel , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, Samuel Holland Subject: [PATCH 2/3] Input: sun4i-lradc-keys: Add optional clock/reset support Date: Tue, 7 Sep 2021 22:40:15 -0500 Message-Id: <20210908034016.24119-3-samuel@sholland.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210908034016.24119-1-samuel@sholland.org> References: <20210908034016.24119-1-samuel@sholland.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210907_204024_727588_38109B9D X-CRM114-Status: GOOD ( 16.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Until the R329, the LRADC hardware was always active. Now it requires enabling a clock gate and deasserting a reset line. Do this if the clock and reset are provided in the device tree, but keep them optional to maintain support for the existing binding. Signed-off-by: Samuel Holland --- drivers/input/keyboard/sun4i-lradc-keys.c | 29 +++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c index 4a796bed48ac..50fc18052829 100644 --- a/drivers/input/keyboard/sun4i-lradc-keys.c +++ b/drivers/input/keyboard/sun4i-lradc-keys.c @@ -14,6 +14,7 @@ * there are no boards known to use channel 1. */ +#include #include #include #include @@ -23,6 +24,7 @@ #include #include #include +#include #include #define LRADC_CTRL 0x00 @@ -83,6 +85,8 @@ struct sun4i_lradc_data { struct device *dev; struct input_dev *input; void __iomem *base; + struct clk *clk; + struct reset_control *reset; struct regulator *vref_supply; struct sun4i_lradc_keymap *chan0_map; const struct lradc_variant *variant; @@ -140,6 +144,14 @@ static int sun4i_lradc_open(struct input_dev *dev) if (error) return error; + error = reset_control_deassert(lradc->reset); + if (error) + goto err_disable_reg; + + error = clk_prepare_enable(lradc->clk); + if (error) + goto err_assert_reset; + lradc->vref = regulator_get_voltage(lradc->vref_supply) * lradc->variant->divisor_numerator / lradc->variant->divisor_denominator; @@ -153,6 +165,13 @@ static int sun4i_lradc_open(struct input_dev *dev) writel(CHAN0_KEYUP_IRQ | CHAN0_KEYDOWN_IRQ, lradc->base + LRADC_INTC); return 0; + +err_assert_reset: + reset_control_assert(lradc->reset); +err_disable_reg: + regulator_disable(lradc->vref_supply); + + return error; } static void sun4i_lradc_close(struct input_dev *dev) @@ -164,6 +183,8 @@ static void sun4i_lradc_close(struct input_dev *dev) SAMPLE_RATE(2), lradc->base + LRADC_CTRL); writel(0, lradc->base + LRADC_INTC); + clk_disable_unprepare(lradc->clk); + reset_control_assert(lradc->reset); regulator_disable(lradc->vref_supply); } @@ -243,6 +264,14 @@ static int sun4i_lradc_probe(struct platform_device *pdev) return -EINVAL; } + lradc->clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(lradc->clk)) + return PTR_ERR(lradc->clk); + + lradc->reset = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(lradc->reset)) + return PTR_ERR(lradc->reset); + lradc->vref_supply = devm_regulator_get(dev, "vref"); if (IS_ERR(lradc->vref_supply)) return PTR_ERR(lradc->vref_supply); -- 2.31.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel