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pwm: pwm-ti*: Get the clock from the PWMSS parent when using old bindings 

When using the old eCAP and ePWM bindings for AM335x and AM437x the clock
can be retrieved from the PWMSS parent. Newer bindings will insure that
this clock is provided via device tree.

Therefore, update this driver to support the newer and older bindings. In
the case of the older binding being used give a warning.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
[thierry.reding@gmail.com: rewrite slightly for readability]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Cooper Jr., Franklin 2016-05-03 10:56:52 -05:00 committed by Thierry Reding
parent e1aaf89a54
commit ae5200d227
2 changed files with 18 additions and 0 deletions
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9
drivers/pwm/pwm-tiecap.c
View File

@ -195,6 +195,7 @@ static const struct pwm_ops ecap_pwm_ops = {
};
static const struct of_device_id ecap_of_match[] = {
{ .compatible = "ti,am3352-ecap" },
{ .compatible = "ti,am33xx-ecap" },
{},
};
@ -202,6 +203,7 @@ MODULE_DEVICE_TABLE(of, ecap_of_match);
static int ecap_pwm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int ret;
struct resource *r;
struct clk *clk;
@ -213,6 +215,13 @@ static int ecap_pwm_probe(struct platform_device *pdev)
return -ENOMEM;
clk = devm_clk_get(&pdev->dev, "fck");
if (IS_ERR(clk)) {
if (of_device_is_compatible(np, "ti,am33xx-ecap")) {
dev_warn(&pdev->dev, "Binding is obsolete.\n");
clk = devm_clk_get(pdev->dev.parent, "fck");
}
}
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
return PTR_ERR(clk);

9
drivers/pwm/pwm-tiehrpwm.c
View File

@ -426,6 +426,7 @@ static const struct pwm_ops ehrpwm_pwm_ops = {
};
static const struct of_device_id ehrpwm_of_match[] = {
{ .compatible = "ti,am3352-ehrpwm" },
{ .compatible = "ti,am33xx-ehrpwm" },
{},
};
@ -433,6 +434,7 @@ MODULE_DEVICE_TABLE(of, ehrpwm_of_match);
static int ehrpwm_pwm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
int ret;
struct resource *r;
struct clk *clk;
@ -444,6 +446,13 @@ static int ehrpwm_pwm_probe(struct platform_device *pdev)
return -ENOMEM;
clk = devm_clk_get(&pdev->dev, "fck");
if (IS_ERR(clk)) {
if (of_device_is_compatible(np, "ti,am33xx-ecap")) {
dev_warn(&pdev->dev, "Binding is obsolete.\n");
clk = devm_clk_get(pdev->dev.parent, "fck");
}
}
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
return PTR_ERR(clk);