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[188.217.56.61]) by smtp.gmail.com with ESMTPSA id c14-20020a170906340e00b006ce98f2581asm3371543ejb.205.2022.03.26.04.19.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Mar 2022 04:19:23 -0700 (PDT) From: Tommaso Merciai To: Cc: tommaso.merciai@amarulasolutions.com, alb3rto.merciai@gmail.com, Peng Fan , Ye Li , Andrey Zhizhikin , Alice Guo , u-boot@lists.denx.de Subject: [PATCH v5 6/9] driver: pwm: pwm-imx: introduce pwm_dm_imx_get_parms Date: Sat, 26 Mar 2022 12:19:07 +0100 Message-Id: <20220326111911.13720-7-tommaso.merciai@amarulasolutions.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220326111911.13720-1-tommaso.merciai@amarulasolutions.com> References: <20220326111911.13720-1-tommaso.merciai@amarulasolutions.com> MIME-Version: 1.0 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.5 at phobos.denx.de X-Virus-Status: Clean Introduce pwm_dm_imx_get_parms, dm version of pwm_imx_get_parms. This function get clock rate using clk dm api Signed-off-by: Tommaso Merciai --- Changes since v3: - Fix clk_get_rate call drivers/pwm/pwm-imx.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 74b0817a05..1d656e726f 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -153,6 +153,36 @@ struct imx_pwm_priv { struct clk ipg_clk; }; +int pwm_dm_imx_get_parms(struct imx_pwm_priv *priv, int period_ns, + int duty_ns, unsigned long *period_c, unsigned long *duty_c, + unsigned long *prescale) +{ + unsigned long long c; + + c = clk_get_rate(&priv->per_clk); + c = c * period_ns; + do_div(c, 1000000000); + *period_c = c; + + *prescale = *period_c / 0x10000 + 1; + + *period_c /= *prescale; + c = *period_c * (unsigned long long)duty_ns; + do_div(c, period_ns); + *duty_c = c; + + /* + * according to imx pwm RM, the real period value should be + * PERIOD value in PWMPR plus 2. + */ + if (*period_c > 2) + *period_c -= 2; + else + *period_c = 0; + + return 0; +} + static int imx_pwm_set_invert(struct udevice *dev, uint channel, bool polarity) { @@ -173,7 +203,7 @@ static int imx_pwm_set_config(struct udevice *dev, uint channel, debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel); - pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, + pwm_dm_imx_get_parms(priv, period_ns, duty_ns, &period_cycles, &duty_cycles, &prescale); return pwm_config_internal(regs, period_cycles, duty_cycles, prescale);