Hi Alexander, All, On 08/21/2014 07:51 PM, Alexander Shiyan wrote: > Thu, 21 Aug 2014 19:23:20 +0300 от Grygorii Strashko <grygorii.strashko@xxxxxx>: >> Hi All, >> >> Alexander, >> >> I've updated gpio-syscon as requested in [3]. >> I still don't like it, but any way I did it :( >> >> Linus, >> >> I'd very appreciated if you can comment on these series. >> Personally, I like v1 [3], because this v2 is not elegant and will >> require constant code patching in case of adding new SoCs or new SoC's versions. >> >> This series intended to integrate Keystone 2 DSP GPIO controller functionality >> into gpio-syscon driver (drivers/gpio/gpio-syscon.c) as requested >> by Linus Walleij in [1]. >> >> On Keystone SOCs, ARM host can send interrupts to DSP cores using the >> DSP GPIO controller IP. Each DSP GPIO controller provides 28 IRQ signals for >> each DSP core. This is one of the component used by the IPC mechanism used >> on Keystone SOCs. >> >> Keystone 2 DSP GPIO controller has specific features: >> - each GPIO can be configured only as output pin; >> - setting GPIO value to 1 causes IRQ generation on target DSP core; >> - reading pin value returns 0 - if IRQ was handled or 1 - IRQ is still >> pending. >> >> The gpio-syscon driver was need to be updated to satisfy Keystone 2 SoC >> requirements: >> - special sequence of operations need to be used to assign output GPIO value. >> As result, first patch introduces SoC specific callback .set() to configure >> output GPIO value. >> >> Also, patch 3 was added to illustrate DSP GPIO configuration in DT used by Keystone 2. >> >> Related sicussions: >> [1] https://lkml.org/lkml/2014/7/16/170 >> [2] https://lkml.org/lkml/2014/7/23/352 >> [3] https://www.mail-archive.com/devicetree@xxxxxxxxxxxxxxx/msg37863.html >> >> Grygorii Strashko (3): >> gpio: syscon: add soc specific callback to assign output value >> gpio: syscon: reuse for keystone 2 socs >> ARM: dts: keystone-k2hk: add dsp gpio controllers nodes >> >> .../bindings/gpio/gpio-mctrl-keystone.txt | 42 ++++++ >> arch/arm/boot/dts/k2hk.dtsi | 48 +++++++ >> drivers/gpio/gpio-syscon.c | 140 ++++++++++++++++++++ >> 3 files changed, 230 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-mctrl-keystone.txt > > 1. mctrl -> dsp in filenames > 2. mctrl -> dsp in documentation. > 3. Here is a more elegant solution for first part. > > --- gpio-syscon.c.old 2014-08-19 09:46:09.000000000 +0400 > +++ gpio-syscon.c 2014-08-21 20:45:49.357529323 +0400 > @@ -111,7 +111,7 @@ > BIT(offs % SYSCON_REG_BITS)); > } > > - syscon_gpio_set(chip, offset, val); > + priv->data->set(chip, offset, val); > > return 0; > } > @@ -159,7 +159,7 @@ > if (priv->data->flags & GPIO_SYSCON_FEAT_IN) > priv->chip.direction_input = syscon_gpio_dir_in; > if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) { > - priv->chip.set = syscon_gpio_set; > + priv->chip.set = priv->data->set ? : syscon_gpio_set; > priv->chip.direction_output = syscon_gpio_dir_out; > } yep. It's better. Thanks for your comments. I'll wait few days with hope to get some comments from comunity (as I'm still thinking v1 is better :) then will update it and re-send. Regards, -grygorii -- 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
