Re: [PATCH v6 20/41] ARM: da830: add new clock init using common clock framework

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 02/02/2018 08:12 AM, Sekhar Nori wrote:
On Saturday 20 January 2018 10:43 PM, David Lechner wrote:
  void __init da830_init_time(void)
  {
+#ifdef CONFIG_COMMON_CLK
+	void __iomem *pll0, *psc0, *psc1;
+	struct clk *clk;
+
+	pll0 = ioremap(DA8XX_PLL0_BASE, SZ_4K);
+	psc0 = ioremap(DA8XX_PSC0_BASE, SZ_4K);
+	psc1 = ioremap(DA8XX_PSC1_BASE, SZ_4K);
+
+	da8xx_register_cfgchip();
+
+	clk_register_fixed_rate(NULL, "ref_clk", NULL, 0, DA830_REF_FREQ);
+
+	da830_pll_clk_init(pll0);
+
+	da830_psc_clk_init(psc0, psc1);
+

+	clk = clk_register_fixed_factor(NULL, "i2c0", "pll0_aux_clk", 0, 1, 1);
+	clk_register_clkdev(clk, NULL, "i2c_davinci.1");
+
+	clk = clk_register_fixed_factor(NULL, "timer0", "pll0_aux_clk", 0, 1, 1);
+	clk_register_clkdev(clk, "timer0", NULL);
+
+	clk = clk_register_fixed_factor(NULL, "timer1", "pll0_aux_clk", 0, 1, 1);
+	clk_register_clkdev(clk, NULL, "davinci-wdt");

Isn't this better done in da830_pll_clk_init() ? I think we can get rid
of the dummy fixed factor clock too and directly use the pll0_auxclk.


I considered it, but I kind of like keeping the fixed factor clocks for
debugging purposes. If you just have "pll0_auxclk" the enable count is
not helpful because you don't know which driver did the enabling.

On the other hand, once things are working, you don't really need to
do any debugging.


That reminds me, is "pll0_aux_clk" above correct, or should it be
"pll0_auxclk" like in da830_pll_clk_init()?

Yes, it should be "pll0_auxclk".


+
+	clk = clk_register_fixed_factor(NULL, "rmii", "pll0_sysclk7", 0, 1, 1);
+	clk_register_clkdev(clk, "rmii", NULL);

I don't see any driver looking for this clock using con_id "rmii". I
know this came from existing code. But its most likely a vestige and can
be dropped.

Thanks,
Sekhar


--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux