From: sam shih <sam.s...@mediatek.com>

This fix mt7628 pwm during configure from userspace. The SoC
is legacy MIPS and has no complex clock tree. This patch add property
clock-frequency to the SoC specific data and legacy MIPS SoC need to
configure it in DT. This property is use for period calculation.

Signed-off-by: Sam Shih <sam.s...@mediatek.com>
---
 drivers/pwm/pwm-mediatek.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index d696df7a58fa..922a7543a2b1 100644
--- a/drivers/pwm/pwm-mediatek.c
+++ b/drivers/pwm/pwm-mediatek.c
@@ -53,6 +53,7 @@ struct pwm_mediatek_chip {
        struct clk *clk_top;
        struct clk *clk_main;
        struct clk **clk_pwms;
+       unsigned int clock_frequency;
        const struct pwm_mediatek_of_data *soc;
 };
 
@@ -139,7 +140,10 @@ static int pwm_mediatek_config(struct pwm_chip *chip, 
struct pwm_device *pwm,
 
        /* Using resolution in picosecond gets accuracy higher */
        resolution = (u64)NSEC_PER_SEC * 1000;
-       do_div(resolution, clk_get_rate(clk));
+       if (pc->soc->has_clks)
+               do_div(resolution, clk_get_rate(clk));
+       else
+               do_div(resolution, pc->clock_frequency);
 
        cnt_period = DIV_ROUND_CLOSEST_ULL((u64)period_ns * 1000, resolution);
        while (cnt_period > 8191) {
@@ -216,6 +220,7 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
        struct pwm_mediatek_chip *pc;
        struct resource *res;
        unsigned int npwms;
+       unsigned int clock_frequency;
        int ret;
 
        pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
@@ -265,6 +270,14 @@ static int pwm_mediatek_probe(struct platform_device *pdev)
                        if (IS_ERR(pc->clk_pwms[i]))
                                return PTR_ERR(pc->clk_pwms[i]);
                }
+       } else {
+               ret = of_property_read_u32(np, "clock-frequency",
+                                               &clock_frequency);
+               if (ret < 0) {
+                       dev_err(&pdev->dev, "failed to get clock_frequency\n");
+                       return ret;
+               }
+               pc->clock_frequency = clock_frequency;
        }
 
        platform_set_drvdata(pdev, pc);
-- 
2.17.1

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