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[86.162.200.138]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-647b412deddsm11547484a12.31.2025.12.08.07.21.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Dec 2025 07:21:38 -0800 (PST) From: Biju X-Google-Original-From: Biju To: =?UTF-8?q?Uwe=20Kleine-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 v4 4/9] pwm: rzg2l-gpt: Add prescale_mult variable to struct rzg2l_gpt_info Date: Mon, 8 Dec 2025 15:21:21 +0000 Message-ID: <20251208152133.269316-5-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251208152133.269316-1-biju.das.jz@bp.renesas.com> References: <20251208152133.269316-1-biju.das.jz@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Biju Das RZ/G3E GPT IP has prescale factor power of 2 where as that of RZ/G2L is 4. Add prescale_mult variable to struct rzg2l_gpt_info for handling this difference. Reviewed-by: Tommaso Merciai Signed-off-by: Biju Das --- v3->v4: * Updated commit header and description * Renamed prescale_pow_of_two_mult_factor->prescale_mult 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 5a8e5a3eb1b1..47324c9fa6dd 100644 --- a/drivers/pwm/pwm-rzg2l-gpt.c +++ b/drivers/pwm/pwm-rzg2l-gpt.c @@ -79,6 +79,7 @@ =20 struct rzg2l_gpt_info { u32 gtcr_tpcs; + u8 prescale_mult; }; =20 struct rzg2l_gpt_chip { @@ -221,6 +222,7 @@ static void rzg2l_gpt_disable(struct rzg2l_gpt_chip *rz= g2l_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 =3D rzg2l_gpt->info; u64 tmp; =20 /* @@ -230,15 +232,18 @@ static u64 rzg2l_gpt_calculate_period_or_duty(struct = rzg2l_gpt_chip *rzg2l_gpt, * < 2^32 * 2^10 * 2^20 * =3D 2^62 */ - tmp =3D (u64)val << (2 * prescale); + tmp =3D (u64)val << (info->prescale_mult * prescale); tmp *=3D USEC_PER_SEC; =20 return DIV64_U64_ROUND_UP(tmp, rzg2l_gpt->rate_khz); } =20 -static u32 rzg2l_gpt_calculate_pv_or_dc(u64 period_or_duty_cycle, u8 presc= ale) +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 * pres= cale)), + return min_t(u64, + DIV_ROUND_DOWN_ULL(period_or_duty_cycle, + 1 << (info->prescale_mult * prescale)), U32_MAX); } =20 @@ -249,6 +254,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chi= p *chip, =20 { struct rzg2l_gpt_chip *rzg2l_gpt =3D to_rzg2l_gpt_chip(chip); + const struct rzg2l_gpt_info *info =3D rzg2l_gpt->info; struct rzg2l_gpt_waveform *wfhw =3D _wfhw; bool is_small_second_period =3D false; u8 ch =3D RZG2L_GET_CH(pwm->hwpwm); @@ -287,7 +293,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chi= p *chip, } =20 wfhw->prescale =3D rzg2l_gpt_calculate_prescale(rzg2l_gpt, period_ticks); - pv =3D rzg2l_gpt_calculate_pv_or_dc(period_ticks, wfhw->prescale); + pv =3D rzg2l_gpt_calculate_pv_or_dc(info, period_ticks, wfhw->prescale); wfhw->gtpr =3D pv; if (is_small_second_period) return 1; @@ -295,7 +301,7 @@ static int rzg2l_gpt_round_waveform_tohw(struct pwm_chi= p *chip, duty_ticks =3D mul_u64_u64_div_u64(wf->duty_length_ns, rzg2l_gpt->rate_kh= z, USEC_PER_SEC); if (duty_ticks > period_ticks) duty_ticks =3D period_ticks; - dc =3D rzg2l_gpt_calculate_pv_or_dc(duty_ticks, wfhw->prescale); + dc =3D rzg2l_gpt_calculate_pv_or_dc(info, duty_ticks, wfhw->prescale); wfhw->gtccr =3D dc; =20 /* @@ -489,6 +495,7 @@ static int rzg2l_gpt_probe(struct platform_device *pdev) =20 static const struct rzg2l_gpt_info rzg2l_data =3D { .gtcr_tpcs =3D RZG2L_GTCR_TPCS, + .prescale_mult =3D 2, }; =20 static const struct of_device_id rzg2l_gpt_of_table[] =3D { --=20 2.43.0