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<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial">I’m trying to do the same sort of thing
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:10.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">On Fri, Feb 13, 2009 at 3:40 AM, <span class="SpellE">Henk</span> <span class="SpellE">Stegeman</span> <<a href="https://ozlabs.org/mailman/listinfo/linuxppc-dev"><span class="SpellE">henk.stegeman</span> at gmail.com</a>> wrote:<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> I'm busy adding support for slave <span class="SpellE">deviced</span> behind mpc52xx-psc-spi.<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> One complication I have is that my SPI slave device has an interrupt output<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">to</span> the CPU.<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> My idea is to add it as a <span class="SpellE">gpios</span> property in the slave <span class="GramE">device's</span><o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">configuration</span>:<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><a href="https://ozlabs.org/mailman/listinfo/linuxppc-dev"><span class="SpellE"><span class="GramE">spi</span></span> at 2400</a> {<span style="mso-spacerun:yes"> </span>// PSC3 (SPI IF to the IO-controller )<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE">device_type</span> = "<span class="SpellE">spi</span>";<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>#address-cells = <1>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>#size-cells = <0>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="GramE">compatible</span> = "fsl,mpc5200-psc-spi","fsl,mpc5200b-psc-spi";<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="GramE">cell-index</span> = <2>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">reg</span></span> = <0x2400 0x100>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>interrupts = <2 3 0>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="GramE">interrupt-parent</span> = <&mpc5200_pic>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">gpios</span></span> = <&gpt4 0 <span class="SpellE">0</span>>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><a href="https://ozlabs.org/mailman/listinfo/linuxppc-dev"><span class="SpellE"><span class="GramE">io</span></span><span class="GramE">-controller</span> at 0</a> {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="GramE">compatible</span> = "microkey,smc4000io";<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">spi</span></span><span class="GramE">-max-frequency</span> = <1000000>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">reg</span></span> = <0>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>// <span class="SpellE">gpios</span>: first is IRQ to <span class="SpellE"><span class="GramE">cpu</span></span><o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">gpios</span></span> = <&gpt6 0 <span class="SpellE">0</span>>;<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>};<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">There is a better way to do this, and driver support for it is<o:p></o:p></span></font></pre>
<pre><span class="GramE"><font size="2" face="Courier New"><span style="font-size:10.0pt">currently</span></font></span> merged into Ben <span class="SpellE">Herrenschmidt's</span> -next tree.<o:p></o:p></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Do this instead:<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><a href="https://ozlabs.org/mailman/listinfo/linuxppc-dev"><span class="SpellE"><span class="GramE">io</span></span><span class="GramE">-controller</span> at 0</a> {<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><span class="GramE">compatible</span> = "microkey,smc4000io";<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">spi</span></span><span class="GramE">-max-frequency</span> = <1000000>;<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><span class="SpellE"><span class="GramE">reg</span></span> = <0>;<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><span class="GramE">interrupt-controller</span> = < &gpt6 >;<span style="mso-spacerun:yes"> </span>// Use GPT6 as<o:p></o:p></span></font></pre>
<pre><span class="GramE"><font size="2" face="Courier New"><span style="font-size:10.0pt">the</span></font></span> IRQ controller<o:p></o:p></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><span class="GramE">interrupts</span> = < 1 >;<span style="mso-spacerun:yes"> </span>// And make it rising edge.<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span>};<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Then add these two properties to the GPT node:<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span><span class="GramE">interrupt-controller</span>;<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><span style="mso-spacerun:yes"> </span>#interrupt-cells = <1>;<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Then you can use normal <span class="SpellE">irq_of_parse_and_<span class="GramE">map</span></span><span class="GramE">(</span>) to set up your handler.<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> How should I then register my <span class="SpellE">spi</span> slave driver? My smc4000io_probe function<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> gets called correctly by <span class="SpellE">of_spi</span> support but when I register as follows:<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">static</span> <span class="SpellE">struct</span> <span class="SpellE">spi_driver</span> smc4000io_driver = {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.driver = {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.name<span style="mso-spacerun:yes"> </span>= "smc4000io",<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.bus<span style="mso-spacerun:yes"> </span>= &<span class="SpellE">spi_bus_type</span>,<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.owner<span style="mso-spacerun:yes"> </span>= THIS_MODULE,<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>},<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.probe<span style="mso-spacerun:yes"> </span>= smc4000io_probe,<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.remove<span style="mso-spacerun:yes"> </span>= __<span class="SpellE">devexit_<span class="GramE">p</span></span><span class="GramE">(</span>smc4000io_remove),<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> };<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">static</span> <span class="SpellE">int</span> __init smc4000io_init(void)<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>return <span class="SpellE">spi_register_<span class="GramE">driver</span></span><span class="GramE">(</span>&smc4000io_driver);<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> }<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">static</span> void __exit smc4000io_exit(void)<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span><span class="SpellE">spi_unregister_<span class="GramE">driver</span></span><span class="GramE">(</span>&smc4000io_driver);<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> }<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="SpellE">module_<span class="GramE">init</span></span><span class="GramE">(</span>smc4000io_init);<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Yes, this is right.<span style="mso-spacerun:yes"> </span>The <span class="SpellE">psc_spi</span> driver automatically registers all<o:p></o:p></span></font></pre>
<pre><span class="SpellE"><span class="GramE"><font size="2" face="Courier New"><span style="font-size:10.0pt">spi</span></font></span></span> children that it finds in the device tree onto the SPI bus.<o:p></o:p></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Therefore registering an <span class="SpellE">spi_<span class="GramE">driver</span></span><span class="GramE">(</span>) is the right thing to do.<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> But when I do:<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">static</span> <span class="SpellE">struct</span> <span class="SpellE">of_platform_driver</span> smc4000_spi_of_driver = {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.name = "smc4000io",<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.<span class="SpellE">match_table</span> = smc4000io_of_match,<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.probe = smc4000io_of_probe,<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>.remove<span style="mso-spacerun:yes"> </span>= __<span class="SpellE">devexit_<span class="GramE">p</span></span><span class="GramE">(</span>smc4000io_of_remove),<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> };<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="GramE">static</span> <span class="SpellE">int</span> __init smc4000io_init(void)<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> {<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><span style="mso-spacerun:yes"> </span>return <span class="SpellE">of_register_platform_<span class="GramE">driver</span></span><span class="GramE">(</span>&smc4000_spi_of_driver);<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> }<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> <span class="SpellE">module_<span class="GramE">init</span></span><span class="GramE">(</span>smc4000io_init);<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"><o:p> </o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">><i><span style="font-style:italic"> Then my smc4000io_of_probe function never gets called.<o:p></o:p></span></i></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Correct.<span style="mso-spacerun:yes"> </span><span class="SpellE">of_platform_driver</span> isn't useful in this case because the<o:p></o:p></span></font></pre>
<pre><span class="GramE"><font size="2" face="Courier New"><span style="font-size:10.0pt">device</span></font></span> cannot exist independently of the SPI bus.<span style="mso-spacerun:yes"> </span>Plus an<o:p></o:p></pre>
<pre><span class="SpellE"><font size="2" face="Courier New"><span style="font-size:10.0pt">of_platform_device</span></font></span> doesn't provide any information about the SPI bus<o:p></o:p></pre>
<pre><span class="GramE"><font size="2" face="Courier New"><span style="font-size:10.0pt">itself</span></font></span>.<o:p></o:p></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><span class="GramE"><font size="2" face="Courier New"><span style="font-size:10.0pt">g</span></font></span>.<o:p></o:p></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt"><o:p> </o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">-- <o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Grant Likely, B.Sc., <span class="SpellE">P.Eng</span>.<o:p></o:p></span></font></pre>
<pre><font size="2" face="Courier New"><span style="font-size:10.0pt">Secret Lab Technologies Ltd.<o:p></o:p></span></font></pre>
<p class="MsoNormal"><font size="2" face="Times New Roman"><span style="font-size:
11.0pt"><o:p> </o:p></span></font></p>
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