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pwm: qpnp: Add support to read the LPG LUT size from device tree

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Add support to read the qcom,lpg-lut-size property from
the device tree instead of using the value returned by the
of_get_address API.

CRs-Fixed: 1060896
Change-Id: I0f84baf29a141719dd44dabb67e9d599d9646d49
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>
This commit is contained in:
Devesh Jhunjhunwala 2016-08-29 16:14:56 -07:00 • committed by Subbaraman Narayanamurthy
parent 8ec8b328f3
commit 1124870d66
2 changed files with 10 additions and 2 deletions
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1
Documentation/devicetree/bindings/pwm/pwm-qpnp.txt
View file

@ -15,6 +15,7 @@ Required device bindings:
- reg-names: Name for the above register.
"qpnp-lpg-channel-base" = physical base address of the
controller's LPG channel register.
- qcom,lpg-lut-size: LPG LUT size.
- qcom,channel-id: channel Id for the PWM.
- qcom,supported-sizes: Supported PWM sizes.
Following three pwm sizes lists are supported by PWM/LPG controllers.

11
drivers/pwm/pwm-qpnp.c
View file

@ -1879,7 +1879,7 @@ static int qpnp_parse_dt_config(struct platform_device *pdev,
int rc, enable, lut_entry_size, list_size, i;
const char *lable;
const __be32 *prop;
u64 size;
u32 size;
struct device_node *node;
int found_pwm_subnode = 0;
int found_lpg_subnode = 0;
@ -1968,11 +1968,18 @@ static int qpnp_parse_dt_config(struct platform_device *pdev,
return rc;
prop = of_get_address_by_name(pdev->dev.of_node, QPNP_LPG_LUT_BASE,
&size, 0);
0, 0);
if (!prop) {
chip->flags |= QPNP_PWM_LUT_NOT_SUPPORTED;
} else {
lpg_config->lut_base_addr = be32_to_cpu(*prop);
rc = of_property_read_u32(of_node, "qcom,lpg-lut-size", &size);
if (rc < 0) {
dev_err(&pdev->dev, "Error reading qcom,lpg-lut-size, rc=%d\n",
rc);
return rc;
}
/*
* Each entry of LUT is of 2 bytes for generic LUT and of 1 byte
* for KPDBL/GLED LUT.