From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guru Das Srinagesh Subject: [PATCH v13 10/11] clk: pwm: Use 64-bit division function Date: Tue, 21 Apr 2020 19:57:22 -0700 Message-ID: <0efec2ac3e9d9d8d7d71e29c9ab7cdcbb02d137d.1587523702.git.gurus@codeaurora.org> References: Return-path: In-Reply-To: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org To: linux-pwm@vger.kernel.org Cc: Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Subbaraman Narayanamurthy , David Collins , linux-kernel@vger.kernel.org, Guru Das Srinagesh , Michael Turquette , Stephen Boyd , linux-clk@vger.kernel.org List-Id: linux-pwm@vger.kernel.org Since the PWM framework is switching struct pwm_args.period's datatype to u64, prepare for this transition by using div64_u64 to handle a 64-bit divisor. Also ensure that divide-by-zero (with fixed_rate as denominator) does not happen with an explicit check with probe failure as a consequence. To: David Laight To: Arnd Bergmann Cc: Michael Turquette Cc: Stephen Boyd Cc: linux-clk@vger.kernel.org Signed-off-by: Guru Das Srinagesh --- drivers/clk/clk-pwm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-pwm.c b/drivers/clk/clk-pwm.c index 87fe0b0e..86f2e2d 100644 --- a/drivers/clk/clk-pwm.c +++ b/drivers/clk/clk-pwm.c @@ -89,7 +89,12 @@ static int clk_pwm_probe(struct platform_device *pdev) } if (of_property_read_u32(node, "clock-frequency", &clk_pwm->fixed_rate)) - clk_pwm->fixed_rate = NSEC_PER_SEC / pargs.period; + clk_pwm->fixed_rate = div64_u64(NSEC_PER_SEC, pargs.period); + + if (!clk_pwm->fixed_rate) { + dev_err(&pdev->dev, "fixed_rate cannot be zero\n"); + return -EINVAL; + } if (pargs.period != NSEC_PER_SEC / clk_pwm->fixed_rate && pargs.period != DIV_ROUND_UP(NSEC_PER_SEC, clk_pwm->fixed_rate)) { -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project