On Sun, Mar 12, 2017 at 02:21:35PM -0600, Simon Glass wrote: > Hi, > > On 3 March 2017 at 03:52, Dr. Philipp Tomsich > <philipp.toms...@theobroma-systems.com> wrote: > > Hi Simon, > > > > On 03 Mar 2017, at 05:52, Simon Glass <s...@chromium.org> wrote: > > > > Hi Philipp, > > > > On 22 February 2017 at 13:47, Philipp Tomsich > > <philipp.toms...@theobroma-systems.com> wrote: > > > > Currently, driver binding stops once it encounters the first > > compatible driver that doesn't refuse to bind. However, there are > > cases where a single node will need to be handled by multiple driver > > classes. For those cases we provide a configurable option to continue > > to bind after the first driver has been found. > > > > The first use cases for this are from the DM conversion of the sunxi > > (Allwinner) architecture: > > * pinctrl (UCLASS_PINCTRL) and gpio (UCLASS_GPIO) drivers need to > > bind against a single node > > * clock (UCLASS_CLK) and reset (UCLASS_RESET) drivers also need to > > bind against a single node > > > > > > Does linux work this way? Another approach would be to have a separate > > MISC driver with two children, one pinctrl, one clk. > > > > > > The linux CLK driver creates and registers a reset-controller; the PINCTRL > > driver > > does the same with the gpio-controller. Similar code to do this is easily > > possible in > > U-Boot … see sunxi_pctrl_bind_gpio(…) in [PATCH v2 1/6] of this series. > > > > However, binding multiple times makes for much simpler code and allows to > > keep > > driver data in separate drivers. > > My question was more whether Linux registers multiple drivers with one > device node. It's just not something I expected.
It does, but it's not really what we're doing in the linux driver. It has one driver, with one device, but registering into multiple frameworks. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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