linux-kernel - Re: [PATCH v7 5/5] clk: renesas: Renesas R9A06G032 clock driver

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Date:   Sat, 26 May 2018 21:45:31 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Michel Pollet <michel.pollet@...renesas.com>
Cc:     kbuild-all@...org, linux-renesas-soc@...r.kernel.org,
        Simon Horman <horms@...ge.net.au>, phil.edworthy@...esas.com,
        Michel Pollet <buserror+upstream@...il.com>,
        Michel Pollet <michel.pollet@...renesas.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 5/5] clk: renesas: Renesas R9A06G032 clock driver

Hi Michel,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on renesas-drivers/clk-renesas]
[also build test WARNING on v4.17-rc6]
[cannot apply to robh/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Michel-Pollet/dt-bindings-Add-the-r9a06g032-sysctrl-h-file/20180526-154235
base:   https://git.kernel.org/pub/scm/linux/kernel/git/geert/renesas-drivers.git clk-renesas
reproduce:
        # apt-get install sparse
        make ARCH=x86_64 allmodconfig
        make C=1 CF=-D__CHECK_ENDIAN__


sparse warnings: (new ones prefixed by >>)

>> drivers/clk/renesas/r9a06g032-clocks.c:430:22: sparse: cast removes address space of expression
>> drivers/clk/renesas/r9a06g032-clocks.c:431:30: sparse: incorrect type in argument 1 (different address spaces) @@    expected unsigned int [noderef] [usertype] <asn:2>*reg @@    got eref] [usertype] <asn:2>*reg @@
   drivers/clk/renesas/r9a06g032-clocks.c:431:30:    expected unsigned int [noderef] [usertype] <asn:2>*reg
   drivers/clk/renesas/r9a06g032-clocks.c:431:30:    got unsigned int [usertype] *reg
   drivers/clk/renesas/r9a06g032-clocks.c:516:22: sparse: cast removes address space of expression
   drivers/clk/renesas/r9a06g032-clocks.c:528:38: sparse: incorrect type in argument 2 (different address spaces) @@    expected unsigned int [noderef] [usertype] <asn:2>*reg @@    got eref] [usertype] <asn:2>*reg @@
   drivers/clk/renesas/r9a06g032-clocks.c:528:38:    expected unsigned int [noderef] [usertype] <asn:2>*reg
   drivers/clk/renesas/r9a06g032-clocks.c:528:38:    got unsigned int [usertype] *reg

vim +430 drivers/clk/renesas/r9a06g032-clocks.c

   421	
   422	#define to_r9a06g032_divider(_hw) \
   423			container_of(_hw, struct r9a06g032_clk_div, hw)
   424	
   425	static unsigned long r9a06g032_divider_recalc_rate(
   426		struct clk_hw *hw,
   427		unsigned long parent_rate)
   428	{
   429		struct r9a06g032_clk_div *clk = to_r9a06g032_divider(hw);
 > 430		u32 *reg = ((u32 *)clk->clocks->reg) + clk->reg;
 > 431		long div = clk_readl(reg);
   432	
   433		if (div < clk->min)
   434			div = clk->min;
   435		else if (div > clk->max)
   436			div = clk->max;
   437		return DIV_ROUND_UP(parent_rate, div);
   438	}
   439	

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