From: Ryder Lee <ryder.lee@mediatek.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
Sean Wang <sean.wang@kernel.org>,
Weijie Gao <weijie.gao@mediatek.com>, <linux-pwm@vger.kernel.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>,
Ryder Lee <ryder.lee@mediatek.com>
Subject: [PATCH v1 1/5] pwm: mediatek: add a property "mediatek,num-pwms"
Date: Fri, 18 Jan 2019 11:24:41 +0800 [thread overview]
Message-ID: <de316385a84e079d3b23891e61c959094b9fa7e5.1547781007.git.ryder.lee@mediatek.com> (raw)
This adds a property "mediatek,num-pwms" to avoid having an endless
list of compatibles with no differences for the same driver.
Thus, the driver should have backwards compatibility to older DTs.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
Changes since v1: add some checks for backwards compatibility.
---
drivers/pwm/pwm-mediatek.c | 27 ++++++++++++++++++---------
1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/drivers/pwm/pwm-mediatek.c b/drivers/pwm/pwm-mediatek.c
index eb6674c..81b7e5e 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 num_pwms; /* it should not be used in the future SoCs */
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, num_pwms;
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++) {
+ /* Check if we have set 'num-pwms' in DTs. */
+ ret = of_property_read_u32(np, "mediatek,num-pwms", &num_pwms);
+ if (ret < 0) {
+ /* If no, fallback to use SoC data for backwards compatibility. */
+ if (pc->soc->num_pwms) {
+ num_pwms = pc->soc->num_pwms;
+ } else {
+ dev_err(&pdev->dev, "failed to get pwm number: %d\n", ret);
+ return ret;
+ }
+ }
+
+ for (i = 0; i < num_pwms + 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 = num_pwms;
ret = pwmchip_add(&pc->chip);
if (ret < 0) {
--
1.9.1
next reply other threads:[~2019-01-18 3:25 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-18 3:24 Ryder Lee [this message]
2019-01-18 3:24 ` [PATCH v1 2/5] dt-bindings: pwm: add a property "mediatek,num-pwms" Ryder Lee
2019-01-18 8:44 ` Matthias Brugger
2019-01-21 8:43 ` Uwe Kleine-König
2019-02-18 20:36 ` Rob Herring
2019-02-19 7:30 ` Uwe Kleine-König
2019-01-18 3:24 ` [PATCH v1 3/5] arm64: dts: mt7622: add a property "mediatek,num-pwms" for PWM Ryder Lee
2019-01-18 8:01 ` [PATCH v1 3/5] arm64: dts: mt7622: add a property "mediatek, num-pwms" " Uwe Kleine-König
2019-01-18 3:24 ` [PATCH v1 4/5] arm: dts: mt7623: add a property "mediatek,num-pwms" " Ryder Lee
2019-01-18 3:24 ` [PATCH v1 5/5] dt-bindings: pwm: update bindings for MT7629 SoC Ryder Lee
2019-02-18 20:38 ` Rob Herring
2019-01-18 7:59 ` [PATCH v1 1/5] pwm: mediatek: add a property "mediatek,num-pwms" Uwe Kleine-König
2019-01-18 9:42 ` Ryder Lee
2019-01-18 9:53 ` Uwe Kleine-König
2019-01-18 10:01 ` Ryder Lee
2019-01-18 8:05 ` Uwe Kleine-König
2019-01-18 9:47 ` Ryder Lee
2019-01-18 8:43 ` Matthias Brugger
2019-01-19 2:54 ` Ryder Lee
2019-01-21 8:49 ` Uwe Kleine-König
2019-01-25 3:48 ` Ryder Lee
2019-01-25 3:52 ` Ryder Lee
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