From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: [PATCH v3 14/20] pwm: sti: Supply PWM Capture clock handling Date: Wed, 8 Jun 2016 10:21:29 +0100 Message-ID: <20160608092135.21184-15-lee.jones@linaro.org> References: <20160608092135.21184-1-lee.jones@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20160608092135.21184-1-lee.jones@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: linux-pwm@vger.kernel.org, kernel@stlinux.com, devicetree@vger.kernel.org, patrice.chotard@st.com, robh+dt@kernel.org, thierry.reding@gmail.com, Lee Jones , maxime.coquelin@st.com List-Id: devicetree@vger.kernel.org ST's PWM IP is supplied by 2 different clocks. One for PWM Output and the other for Capture. This patch provides clock handling for the latter. Signed-off-by: Lee Jones --- drivers/pwm/pwm-sti.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/pwm/pwm-sti.c b/drivers/pwm/pwm-sti.c index 2f61e1e..78979d0 100644 --- a/drivers/pwm/pwm-sti.c +++ b/drivers/pwm/pwm-sti.c @@ -74,6 +74,7 @@ struct sti_pwm_compat_data { struct sti_pwm_chip { struct device *dev; struct clk *pwm_clk; + struct clk *cpt_clk; struct regmap *regmap; struct sti_pwm_compat_data *cdata; struct regmap_field *prescale_low; @@ -183,6 +184,10 @@ static int sti_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, if (ret) return ret; + ret = clk_enable(pc->cpt_clk); + if (ret) + return ret; + if (!period_same) { ret = sti_pwm_get_prescale(pc, period_ns, &prescale); if (ret) @@ -227,6 +232,7 @@ static int sti_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, clk_dis: clk_disable(pc->pwm_clk); + clk_disable(pc->cpt_clk); return ret; } @@ -246,6 +252,10 @@ static int sti_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) if (ret) goto out; + ret = clk_enable(pc->cpt_clk); + if (ret) + goto out; + ret = regmap_field_write(pc->pwm_out_en, 1); if (ret) { dev_err(dev, "failed to enable PWM device:%d\n", @@ -271,6 +281,7 @@ static void sti_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) regmap_field_write(pc->pwm_out_en, 0); clk_disable(pc->pwm_clk); + clk_disable(pc->cpt_clk); mutex_unlock(&pc->sti_pwm_lock); } @@ -390,6 +401,18 @@ static int sti_pwm_probe(struct platform_device *pdev) return ret; } + pc->cpt_clk = of_clk_get_by_name(dev->of_node, "capture"); + if (IS_ERR(pc->cpt_clk)) { + dev_err(dev, "failed to get PWM capture clock\n"); + return PTR_ERR(pc->cpt_clk); + } + + ret = clk_prepare(pc->cpt_clk); + if (ret) { + dev_err(dev, "failed to prepare clock\n"); + return ret; + } + pc->chip.dev = dev; pc->chip.ops = &sti_pwm_ops; pc->chip.base = -1; @@ -399,6 +422,7 @@ static int sti_pwm_probe(struct platform_device *pdev) ret = pwmchip_add(&pc->chip); if (ret < 0) { clk_unprepare(pc->pwm_clk); + clk_unprepare(pc->cpt_clk); return ret; } @@ -416,6 +440,7 @@ static int sti_pwm_remove(struct platform_device *pdev) pwm_disable(&pc->chip.pwms[i]); clk_unprepare(pc->pwm_clk); + clk_unprepare(pc->cpt_clk); return pwmchip_remove(&pc->chip); } -- 2.8.3