linux-kernel - Re: [PATCH v1 2/3] of: Add support for reading a s32 from a multi-value property.

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Date:   Mon, 22 Aug 2016 22:07:40 +0800
From:   Finley Xiao <finley.xiao@...k-chips.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     srinivas.kandagatla@...aro.org, maxime.ripard@...e-electrons.com,
        robh+dt@...nel.org, frowand.list@...il.com, sre@...nel.org,
        dbaryshkov@...il.com, mark.rutland@....com, khilman@...nel.org,
        nm@...com, rjw@...ysocki.net, viresh.kumar@...aro.org,
        sboyd@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        wxt@...k-chips.com, jay.xu@...k-chips.com,
        rocky.hao@...k-chips.com, tim.chen@...k-chips.com,
        tony.xie@...k-chips.com, ulysses.huang@...k-chips.com,
        lin.huang@...k-chips.com
Subject: Re: [PATCH v1 2/3] of: Add support for reading a s32 from a
 multi-value property.



在 2016/8/20 4:47, David Woodhouse 写道:
> On Fri, 2016-08-19 at 22:41 +0200, Heiko Stuebner wrote:
>>> So no, don't *add* any more of these functions. Only add the generic
>>> version. And if your driver isn't using the generic property
>>> functions... fix it.
>> As far as I can see, all the device_property_* functions are grounded on their
>> of_property_*, acpi_property_* etc counterparts and functions reading specific
>> elements (the _index variants) are currently not available at all.
>>
>> drivers/base/property.c:
>> #define OF_DEV_PROP_READ_ARRAY(node, propname, type, val, nval)                         \
>>          (val) ? of_property_read_##type##_array((node), (propname), (val), (nval))      \
>>                : of_property_count_elems_of_size((node), (propname), sizeof(type))
>>
>> So even if you're using the device_property_* functions you'd still need
>> a match in the underlying functions or am I missing something?
> Yes, but the underlying function should never be used directly by
> drivers. And should probably be prefixed with __ or marked deprecated
> (with an override in its one genuine call site).
>

So can I add a device_property_read_s32_array function in property.h?

--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -108,6 +108,13 @@ static inline int device_property_read_u32(struct 
device *dev,
         return device_property_read_u32_array(dev, propname, val, 1);
  }

+static inline int device_property_read_s32_array(struct device *dev, 
const char *propname,
+                                  s32 *val, size_t nval)
+{
+       return device_property_read_u32_array(struct device *dev, const 
char *propname,
+                                  (u32 *)val, size_t nval);
+}

-- 
Finley