diff options
Diffstat (limited to 'drivers/pwm/pwm-mediatek.c')
| -rw-r--r-- | drivers/pwm/pwm-mediatek.c | 79 |
1 files changed, 44 insertions, 35 deletions
diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c index 9394735b0762..db986b77e556 100644 --- a/drivers/pwm/pwm-mediatek.c +++ b/drivers/pwm/pwm-mediatek.c @@ -35,25 +35,6 @@ #define PWM_CLK_DIV_MAX 7 -enum { - MTK_CLK_MAIN = 0, - MTK_CLK_TOP, - MTK_CLK_PWM1, - MTK_CLK_PWM2, - MTK_CLK_PWM3, - MTK_CLK_PWM4, - MTK_CLK_PWM5, - MTK_CLK_PWM6, - MTK_CLK_PWM7, - MTK_CLK_PWM8, - MTK_CLK_MAX, -}; - -static const char * const mtk_pwm_clk_name[MTK_CLK_MAX] = { - "main", "top", "pwm1", "pwm2", "pwm3", "pwm4", "pwm5", "pwm6", "pwm7", - "pwm8" -}; - struct mtk_pwm_platform_data { unsigned int num_pwms; bool pwm45_fixup; @@ -63,12 +44,17 @@ struct mtk_pwm_platform_data { * struct mtk_pwm_chip - struct representing PWM chip * @chip: linux PWM chip representation * @regs: base address of PWM chip - * @clks: list of clocks + * @clk_top: the top clock generator + * @clk_main: the clock used by PWM core + * @clk_pwms: the clock used by each PWM channel + * @clk_freq: the fix clock frequency of legacy MIPS SoC */ struct mtk_pwm_chip { struct pwm_chip chip; void __iomem *regs; - struct clk *clks[MTK_CLK_MAX]; + struct clk *clk_top; + struct clk *clk_main; + struct clk **clk_pwms; const struct mtk_pwm_platform_data *soc; }; @@ -86,24 +72,24 @@ static int mtk_pwm_clk_enable(struct pwm_chip *chip, struct pwm_device *pwm) struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip); int ret; - ret = clk_prepare_enable(pc->clks[MTK_CLK_TOP]); + ret = clk_prepare_enable(pc->clk_top); if (ret < 0) return ret; - ret = clk_prepare_enable(pc->clks[MTK_CLK_MAIN]); + ret = clk_prepare_enable(pc->clk_main); if (ret < 0) goto disable_clk_top; - ret = clk_prepare_enable(pc->clks[MTK_CLK_PWM1 + pwm->hwpwm]); + ret = clk_prepare_enable(pc->clk_pwms[pwm->hwpwm]); if (ret < 0) goto disable_clk_main; return 0; disable_clk_main: - clk_disable_unprepare(pc->clks[MTK_CLK_MAIN]); + clk_disable_unprepare(pc->clk_main); disable_clk_top: - clk_disable_unprepare(pc->clks[MTK_CLK_TOP]); + clk_disable_unprepare(pc->clk_top); return ret; } @@ -112,9 +98,9 @@ static void mtk_pwm_clk_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip); - clk_disable_unprepare(pc->clks[MTK_CLK_PWM1 + pwm->hwpwm]); - clk_disable_unprepare(pc->clks[MTK_CLK_MAIN]); - clk_disable_unprepare(pc->clks[MTK_CLK_TOP]); + clk_disable_unprepare(pc->clk_pwms[pwm->hwpwm]); + clk_disable_unprepare(pc->clk_main); + clk_disable_unprepare(pc->clk_top); } static inline u32 mtk_pwm_readl(struct mtk_pwm_chip *chip, unsigned int num, @@ -134,7 +120,7 @@ static int mtk_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct mtk_pwm_chip *pc = to_mtk_pwm_chip(chip); - struct clk *clk = pc->clks[MTK_CLK_PWM1 + pwm->hwpwm]; + struct clk *clk = pc->clk_pwms[pwm->hwpwm]; u32 clkdiv = 0, cnt_period, cnt_duty, reg_width = PWMDWIDTH, reg_thres = PWMTHRES; u64 resolution; @@ -235,12 +221,35 @@ static int mtk_pwm_probe(struct platform_device *pdev) if (IS_ERR(pc->regs)) return PTR_ERR(pc->regs); - for (i = 0; i < pc->soc->num_pwms + 2; i++) { - pc->clks[i] = devm_clk_get(&pdev->dev, mtk_pwm_clk_name[i]); - if (IS_ERR(pc->clks[i])) { + pc->clk_pwms = devm_kcalloc(&pdev->dev, pc->soc->num_pwms, + sizeof(*pc->clk_pwms), GFP_KERNEL); + if (!pc->clk_pwms) + return -ENOMEM; + + pc->clk_top = devm_clk_get(&pdev->dev, "top"); + if (IS_ERR(pc->clk_top)) { + dev_err(&pdev->dev, "clock: top fail: %ld\n", + PTR_ERR(pc->clk_top)); + return PTR_ERR(pc->clk_top); + } + + pc->clk_main = devm_clk_get(&pdev->dev, "main"); + if (IS_ERR(pc->clk_main)) { + dev_err(&pdev->dev, "clock: main fail: %ld\n", + PTR_ERR(pc->clk_main)); + return PTR_ERR(pc->clk_main); + } + + for (i = 0; i < pc->soc->num_pwms; i++) { + char name[8]; + + snprintf(name, sizeof(name), "pwm%d", i + 1); + + pc->clk_pwms[i] = devm_clk_get(&pdev->dev, name); + if (IS_ERR(pc->clk_pwms[i])) { dev_err(&pdev->dev, "clock: %s fail: %ld\n", - mtk_pwm_clk_name[i], PTR_ERR(pc->clks[i])); - return PTR_ERR(pc->clks[i]); + name, PTR_ERR(pc->clk_pwms[i])); + return PTR_ERR(pc->clk_pwms[i]); } } |