From: Ryder Lee <ryder....@mediatek.com> This adds a property "num-pwms" to avoid having an endless list of compatibles with no differences for the same driver.
Signed-off-by: Ryder Lee <ryder....@mediatek.com> Signed-off-by: Sam Shih <sam.s...@mediatek.com> --- Used: https://patchwork.kernel.org/project/linux-mediatek/list/?series=68207 Changes since v2: - use num-pwms instead of mediatek,num-pwms. - rename the member from num_pwms to fallback_num_pwms to make it more obvious that it doesn't represent the actually used value. - add a dev_warn and a expressive comment to help other developers to not start adding num_pwms in the compatible_data. Changes since v1: - add some checks for backwards compatibility. --- drivers/pwm/pwm-mediatek.c | 35 ++++++++++++++++++++++------------- 1 file changed, 22 insertions(+), 13 deletions(-) diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c index eb6674c..f9d67fb 100644 --- a/drivers/pwm/pwm-mediatek.c +++ b/drivers/pwm/pwm-mediatek.c @@ -55,7 +55,7 @@ enum { }; struct mtk_pwm_platform_data { - unsigned int num_pwms; + unsigned int fallback_npwms; bool pwm45_fixup; bool has_clks; }; @@ -226,27 +226,36 @@ static void mtk_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) static int mtk_pwm_probe(struct platform_device *pdev) { - const struct mtk_pwm_platform_data *data; + struct device_node *np = pdev->dev.of_node; struct mtk_pwm_chip *pc; struct resource *res; - unsigned int i; + unsigned int i, npwms; int ret; pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL); if (!pc) return -ENOMEM; - data = of_device_get_match_data(&pdev->dev); - if (data == NULL) - return -EINVAL; - pc->soc = data; + pc->soc = of_device_get_match_data(&pdev->dev); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); pc->regs = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(pc->regs)) return PTR_ERR(pc->regs); - for (i = 0; i < data->num_pwms + 2 && pc->soc->has_clks; i++) { + ret = of_property_read_u32(np, "num-pwms", &npwms); + if (ret < 0) { + /* It's deprecated, we should specify num_pwms via DT now. */ + if (pc->soc->fallback_npwms) { + npwms = pc->soc->fallback_npwms; + dev_warn(&pdev->dev, "DT is outdated, please update it\n"); + } else { + dev_err(&pdev->dev, "failed to get number of PWMs\n"); + return ret; + } + } + + for (i = 0; i < npwms + 2 && pc->soc->has_clks; i++) { pc->clks[i] = devm_clk_get(&pdev->dev, mtk_pwm_clk_name[i]); if (IS_ERR(pc->clks[i])) { dev_err(&pdev->dev, "clock: %s fail: %ld\n", @@ -260,7 +269,7 @@ static int mtk_pwm_probe(struct platform_device *pdev) pc->chip.dev = &pdev->dev; pc->chip.ops = &mtk_pwm_ops; pc->chip.base = -1; - pc->chip.npwm = data->num_pwms; + pc->chip.npwm = npwms; ret = pwmchip_add(&pc->chip); if (ret < 0) { @@ -279,25 +288,25 @@ static int mtk_pwm_remove(struct platform_device *pdev) } static const struct mtk_pwm_platform_data mt2712_pwm_data = { - .num_pwms = 8, + .fallback_npwms = 8, .pwm45_fixup = false, .has_clks = true, }; static const struct mtk_pwm_platform_data mt7622_pwm_data = { - .num_pwms = 6, + .fallback_npwms = 6, .pwm45_fixup = false, .has_clks = true, }; static const struct mtk_pwm_platform_data mt7623_pwm_data = { - .num_pwms = 5, + .fallback_npwms = 5, .pwm45_fixup = true, .has_clks = true, }; static const struct mtk_pwm_platform_data mt7628_pwm_data = { - .num_pwms = 4, + .fallback_npwms = 4, .pwm45_fixup = true, .has_clks = false, }; -- 1.9.1
