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[86.139.30.37]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-464f0aac3fdsm238940435e9.1.2025.09.23.07.45.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Sep 2025 07:45:28 -0700 (PDT) From: Biju X-Google-Original-From: Biju To: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Geert Uytterhoeven , Magnus Damm Cc: Biju Das , linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Prabhakar Mahadev Lad , Biju Das , Tommaso Merciai Subject: [PATCH v3 3/8] pwm: rzg2l-gpt: Add prescale_pow_of_two_mult_factor variable to struct rzg2l_gpt_info Date: Tue, 23 Sep 2025 15:45:07 +0100 Message-ID: <20250923144524.191892-4-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250923144524.191892-1-biju.das.jz@bp.renesas.com> References: <20250923144524.191892-1-biju.das.jz@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Biju Das RZ/G3E GPT IP has prescale factor power of 2 where as that of RZ/G2L is 4. Add prescale_pow_of_two_mult_factor variable to struct rzg2l_gpt_info for handling this difference. Reviewed-by: Tommaso Merciai Signed-off-by: Biju Das --- v2->v3: * No change. v1->v2: * Collected tag. --- drivers/pwm/pwm-rzg2l-gpt.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/pwm/pwm-rzg2l-gpt.c b/drivers/pwm/pwm-rzg2l-gpt.c index 1d09fb01c72f..d1baac37c771 100644 --- a/drivers/pwm/pwm-rzg2l-gpt.c +++ b/drivers/pwm/pwm-rzg2l-gpt.c @@ -91,6 +91,7 @@ struct rzg2l_gpt_info { u32 gtcr_tpcs_mask; + u8 prescale_pow_of_two_mult_factor; }; struct rzg2l_gpt_chip { @@ -229,6 +230,7 @@ static void rzg2l_gpt_disable(struct rzg2l_gpt_chip *rzg2l_gpt, static u64 rzg2l_gpt_calculate_period_or_duty(struct rzg2l_gpt_chip *rzg2l_gpt, u32 val, u8 prescale) { + const struct rzg2l_gpt_info *info = rzg2l_gpt->info; u64 tmp; /* @@ -238,15 +240,18 @@ static u64 rzg2l_gpt_calculate_period_or_duty(struct rzg2l_gpt_chip *rzg2l_gpt, * < 2^32 * 2^10 * 2^20 * = 2^62 */ - tmp = (u64)val << (2 * prescale); + tmp = (u64)val << (info->prescale_pow_of_two_mult_factor * prescale); tmp *= USEC_PER_SEC; return DIV64_U64_ROUND_UP(tmp, rzg2l_gpt->rate_khz); } -static u32 rzg2l_gpt_calculate_pv_or_dc(u64 period_or_duty_cycle, u8 prescale) +static u32 rzg2l_gpt_calculate_pv_or_dc(const struct rzg2l_gpt_info *info, + u64 period_or_duty_cycle, u8 prescale) { - return min_t(u64, DIV_ROUND_DOWN_ULL(period_or_duty_cycle, 1 << (2 * prescale)), + return min_t(u64, + DIV_ROUND_DOWN_ULL(period_or_duty_cycle, + 1 << (info->prescale_pow_of_two_mult_factor * prescale)), U32_MAX); } @@ -257,6 +262,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chip *chip, { struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); + const struct rzg2l_gpt_info *info = rzg2l_gpt->info; struct rzg2l_gpt_waveform *wfhw = _wfhw; bool is_small_second_period = false; u8 ch = RZG2L_GET_CH(pwm->hwpwm); @@ -291,7 +297,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chip *chip, } wfhw->prescale = rzg2l_gpt_calculate_prescale(rzg2l_gpt, period_ticks); - pv = rzg2l_gpt_calculate_pv_or_dc(period_ticks, wfhw->prescale); + pv = rzg2l_gpt_calculate_pv_or_dc(info, period_ticks, wfhw->prescale); wfhw->gtpr = pv; if (is_small_second_period) return 1; @@ -299,7 +305,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chip *chip, duty_ticks = mul_u64_u64_div_u64(wf->duty_length_ns, rzg2l_gpt->rate_khz, USEC_PER_SEC); if (duty_ticks > period_ticks) duty_ticks = period_ticks; - dc = rzg2l_gpt_calculate_pv_or_dc(duty_ticks, wfhw->prescale); + dc = rzg2l_gpt_calculate_pv_or_dc(info, duty_ticks, wfhw->prescale); wfhw->gtccr = dc; /* @@ -493,6 +499,7 @@ static int rzg2l_gpt_probe(struct platform_device *pdev) static const struct rzg2l_gpt_info rzg2l_data = { .gtcr_tpcs_mask = GENMASK(26, 24), + .prescale_pow_of_two_mult_factor = 2, }; static const struct of_device_id rzg2l_gpt_of_table[] = {