linux-kernel - [PATCH 2/5] pwm: pwm-mediatek: always use bus clock

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Date:   Mon, 19 Oct 2020 16:07:02 +0200
From:   Fabien Parent <fparent@...libre.com>
To:     linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pwm@...r.kernel.org
Cc:     matthias.bgg@...il.com, robh+dt@...nel.org, lee.jones@...aro.org,
        u.kleine-koenig@...gutronix.de, thierry.reding@...il.com,
        Fabien Parent <fparent@...libre.com>
Subject: [PATCH 2/5] pwm: pwm-mediatek: always use bus clock

The MediaTek PWM IP can sometimes use the 26MHz source clock to generate
the PWM signal, but the driver currently assumes that we always use
the PWM bus clock to generate the PWM signal.

This commit modifies the PWM driver in order to force the PWM IP to
always use the bus clock as source clock.

I do not have the datasheet of all the MediaTek SoC, so I don't know
if the register to choose the source clk is present in all the SoCs
or only in subset. As a consequence I made this change optional by
using a platform data paremeter to says whether this register is
supported or not. On all the SoC I don't have the datasheet
(MT2712, MT7622, MT7623, MT7628, MT7629) I kept the behavior
to be the same as before this change.

Signed-off-by: Fabien Parent <fparent@...libre.com>
---
 drivers/pwm/pwm-mediatek.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index ab001ce55178..108881619aea 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -30,12 +30,14 @@
 #define PWM45DWIDTH_FIXUP	0x30
 #define PWMTHRES		0x30
 #define PWM45THRES_FIXUP	0x34
+#define PWM_CK_26M_SEL		0x210
 
 #define PWM_CLK_DIV_MAX		7
 
 struct pwm_mediatek_of_data {
 	unsigned int num_pwms;
 	bool pwm45_fixup;
+	bool has_ck_26m_sel;
 };
 
 /**
@@ -132,6 +134,10 @@ static int pwm_mediatek_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (ret < 0)
 		return ret;
 
+	/* Make sure we use the bus clock and not the 26MHz clock */
+	if (pc->soc->has_ck_26m_sel)
+		writel(0, pc->regs + PWM_CK_26M_SEL);
+
 	/* Using resolution in picosecond gets accuracy higher */
 	resolution = (u64)NSEC_PER_SEC * 1000;
 	do_div(resolution, clk_get_rate(pc->clk_pwms[pwm->hwpwm]));
@@ -281,31 +287,37 @@ static int pwm_mediatek_remove(struct platform_device *pdev)
 static const struct pwm_mediatek_of_data mt2712_pwm_data = {
 	.num_pwms = 8,
 	.pwm45_fixup = false,
+	.has_ck_26m_sel = false,
 };
 
 static const struct pwm_mediatek_of_data mt7622_pwm_data = {
 	.num_pwms = 6,
 	.pwm45_fixup = false,
+	.has_ck_26m_sel = false,
 };
 
 static const struct pwm_mediatek_of_data mt7623_pwm_data = {
 	.num_pwms = 5,
 	.pwm45_fixup = true,
+	.has_ck_26m_sel = false,
 };
 
 static const struct pwm_mediatek_of_data mt7628_pwm_data = {
 	.num_pwms = 4,
 	.pwm45_fixup = true,
+	.has_ck_26m_sel = false,
 };
 
 static const struct pwm_mediatek_of_data mt7629_pwm_data = {
 	.num_pwms = 1,
 	.pwm45_fixup = false,
+	.has_ck_26m_sel = false,
 };
 
 static const struct pwm_mediatek_of_data mt8516_pwm_data = {
 	.num_pwms = 5,
 	.pwm45_fixup = false,
+	.has_ck_26m_sel = true,
 };
 
 static const struct of_device_id pwm_mediatek_of_match[] = {
-- 
2.28.0