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Subject[PATCH v2 1/10] pwm: mediatek: add a property "num-pwms"
Date
From: Ryder Lee <ryder.lee@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.lee@mediatek.com>
Signed-off-by: Sam Shih <sam.shih@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dev, "DT is outdated, please update it\n");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
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