linux-kernel - [PATCH 2/7] pwm: rzg2l-gpt: Add info variable to struct rzg2l_gpt

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Message-ID: <20250814184115.192930-3-biju.das.jz@bp.renesas.com>
Date: Thu, 14 Aug 2025 19:41:06 +0100
From: Biju <biju.das.au@...il.com>
To: Uwe Kleine-König <ukleinek@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: Biju Das <biju.das.jz@...renesas.com>,
	linux-pwm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
	Biju Das <biju.das.au@...il.com>
Subject: [PATCH 2/7] pwm: rzg2l-gpt: Add info variable to struct rzg2l_gpt_chip

From: Biju Das <biju.das.jz@...renesas.com>

RZ/G3E GPT IP is similar to the one found on RZ/G2L GPT, but there are
some differences. The field width of prescalar on RZ/G3E is 4 whereas on
RZ/G2L it is 3. Add rzg2l_gpt_info variable to handle this differences.
The FIELD_PREP and FIELD_GET macro is giving compilation issue as the
parameters are not build time constants. So added Non-constant mask
variant of FIELD_GET() and FIELD_PREP().

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
 drivers/pwm/pwm-rzg2l-gpt.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/drivers/pwm/pwm-rzg2l-gpt.c b/drivers/pwm/pwm-rzg2l-gpt.c
index f0a8531457ca..bf989defa527 100644
--- a/drivers/pwm/pwm-rzg2l-gpt.c
+++ b/drivers/pwm/pwm-rzg2l-gpt.c
@@ -33,6 +33,19 @@
 #include <linux/time.h>
 #include <linux/units.h>
 
+/* Non-constant mask variant of FIELD_GET() and FIELD_PREP() */
+#define field_get(_mask, _reg)	\
+({\
+	typeof(_mask) (mask) = (_mask); \
+	(((_reg) & (mask)) >> (ffs(mask) - 1)); \
+})
+
+#define field_prep(_mask, _val)	\
+({\
+	typeof(_mask) (mask) = (_mask); \
+	(((_val) << (ffs(mask) - 1)) & (mask)); \
+})
+
 #define RZG2L_GET_CH(hwpwm)	((hwpwm) / 2)
 #define RZG2L_GET_CH_OFFS(ch)	(0x100 * (ch))
 
@@ -46,7 +59,6 @@
 
 #define RZG2L_GTCR_CST		BIT(0)
 #define RZG2L_GTCR_MD		GENMASK(18, 16)
-#define RZG2L_GTCR_TPCS		GENMASK(26, 24)
 
 #define RZG2L_GTCR_MD_SAW_WAVE_PWM_MODE	FIELD_PREP(RZG2L_GTCR_MD, 0)
 
@@ -77,9 +89,14 @@
 #define RZG2L_MAX_SCALE_FACTOR	1024
 #define RZG2L_MAX_TICKS		((u64)U32_MAX * RZG2L_MAX_SCALE_FACTOR)
 
+struct rzg2l_gpt_info {
+	u32 gtcr_tpcs_mask;
+};
+
 struct rzg2l_gpt_chip {
 	void __iomem *mmio;
 	struct mutex lock; /* lock to protect shared channel resources */
+	const struct rzg2l_gpt_info *info;
 	unsigned long rate_khz;
 	u32 period_ticks[RZG2L_MAX_HW_CHANNELS];
 	u32 channel_request_count[RZG2L_MAX_HW_CHANNELS];
@@ -317,7 +334,7 @@ static int rzg2l_gpt_read_waveform(struct pwm_chip *chip,
 
 	if (rzg2l_gpt_is_ch_enabled(rzg2l_gpt, pwm->hwpwm)) {
 		gtcr = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTCR(ch));
-		wfhw->prescale = FIELD_GET(RZG2L_GTCR_TPCS, gtcr);
+		wfhw->prescale = field_get(rzg2l_gpt->info->gtcr_tpcs_mask, gtcr);
 		wfhw->gtpr = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTPR(ch));
 		wfhw->gtccr = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTCCR(ch, sub_ch));
 		if (wfhw->gtccr > wfhw->gtpr)
@@ -354,8 +371,8 @@ static int rzg2l_gpt_write_waveform(struct pwm_chip *chip,
 		rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTUDDTYC(ch), RZG2L_GTUDDTYC_UP_COUNTING);
 
 		/* Select count clock */
-		rzg2l_gpt_modify(rzg2l_gpt, RZG2L_GTCR(ch), RZG2L_GTCR_TPCS,
-				 FIELD_PREP(RZG2L_GTCR_TPCS, wfhw->prescale));
+		rzg2l_gpt_modify(rzg2l_gpt, RZG2L_GTCR(ch), rzg2l_gpt->info->gtcr_tpcs_mask,
+				 field_prep(rzg2l_gpt->info->gtcr_tpcs_mask, wfhw->prescale));
 
 		/* Set period */
 		rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTPR(ch), wfhw->gtpr);
@@ -414,6 +431,8 @@ static int rzg2l_gpt_probe(struct platform_device *pdev)
 	if (IS_ERR(rzg2l_gpt->mmio))
 		return PTR_ERR(rzg2l_gpt->mmio);
 
+	rzg2l_gpt->info = of_device_get_match_data(dev);
+
 	rstc = devm_reset_control_get_exclusive_deasserted(dev, NULL);
 	if (IS_ERR(rstc))
 		return dev_err_probe(dev, PTR_ERR(rstc), "Cannot deassert reset control\n");
@@ -456,8 +475,12 @@ static int rzg2l_gpt_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct rzg2l_gpt_info rzg2l_data = {
+	.gtcr_tpcs_mask = GENMASK(26, 24),
+};
+
 static const struct of_device_id rzg2l_gpt_of_table[] = {
-	{ .compatible = "renesas,rzg2l-gpt", },
+	{ .compatible = "renesas,rzg2l-gpt", .data = &rzg2l_data },
 	{ /* Sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rzg2l_gpt_of_table);
-- 
2.43.0