* [PATCH 0/2] MFD core updates for device tree binding support @ 2019-06-04 22:35 Robert Hancock 2019-06-04 22:35 ` [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type Robert Hancock 2019-06-04 22:35 ` [PATCH 2/2] mfd: core: Set fwnode for created devices Robert Hancock 0 siblings, 2 replies; 11+ messages in thread From: Robert Hancock @ 2019-06-04 22:35 UTC (permalink / raw) To: linux-kernel; +Cc: lee.jones, Robert Hancock Fixes for the device tree binding support in MFD core. Robert Hancock (2): mfd: core: Support multiple OF child devices of the same type mfd: core: Set fwnode for created devices drivers/mfd/mfd-core.c | 6 +++++- include/linux/mfd/core.h | 3 +++ 2 files changed, 8 insertions(+), 1 deletion(-) -- 1.8.3.1 ^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-04 22:35 [PATCH 0/2] MFD core updates for device tree binding support Robert Hancock @ 2019-06-04 22:35 ` Robert Hancock 2019-06-05 6:31 ` Lee Jones 2019-06-04 22:35 ` [PATCH 2/2] mfd: core: Set fwnode for created devices Robert Hancock 1 sibling, 1 reply; 11+ messages in thread From: Robert Hancock @ 2019-06-04 22:35 UTC (permalink / raw) To: linux-kernel; +Cc: lee.jones, Robert Hancock Previously the MFD core supported assigning OF nodes to created MFD devices, but relied solely on matching the of_compatible string. This would result in devices being potentially assigned the wrong node if there are multiple devices with the same compatible string within a multifunction device. Add support for matching the full name of the node in the MFD cell definition, so that we can match against a specific instance of a device. If this is not specified, we match just based on the compatible string, as before. Signed-off-by: Robert Hancock <hancock@sedsystems.ca> --- drivers/mfd/mfd-core.c | 5 ++++- include/linux/mfd/core.h | 3 +++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 1ade4c8..74bc895 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -177,7 +177,10 @@ static int mfd_add_device(struct device *parent, int id, if (parent->of_node && cell->of_compatible) { for_each_child_of_node(parent->of_node, np) { - if (of_device_is_compatible(np, cell->of_compatible)) { + if (of_device_is_compatible(np, cell->of_compatible) && + (!cell->of_full_name || + !strcmp(cell->of_full_name, + of_node_full_name(np)))) { pdev->dev.of_node = np; break; } diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h index 99c0395..470f6cb 100644 --- a/include/linux/mfd/core.h +++ b/include/linux/mfd/core.h @@ -55,6 +55,9 @@ struct mfd_cell { */ const char *of_compatible; + /* Optionally match against a specific device of a given type */ + const char *of_full_name; + /* Matches ACPI */ const struct mfd_cell_acpi_match *acpi_match; -- 1.8.3.1 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-04 22:35 ` [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type Robert Hancock @ 2019-06-05 6:31 ` Lee Jones 2019-06-05 16:23 ` Robert Hancock 0 siblings, 1 reply; 11+ messages in thread From: Lee Jones @ 2019-06-05 6:31 UTC (permalink / raw) To: Robert Hancock; +Cc: linux-kernel On Tue, 04 Jun 2019, Robert Hancock wrote: > Previously the MFD core supported assigning OF nodes to created MFD > devices, but relied solely on matching the of_compatible string. This > would result in devices being potentially assigned the wrong node if > there are multiple devices with the same compatible string within a > multifunction device. > > Add support for matching the full name of the node in the MFD cell > definition, so that we can match against a specific instance of a > device. If this is not specified, we match just based on the > compatible string, as before. > > Signed-off-by: Robert Hancock <hancock@sedsystems.ca> > --- > drivers/mfd/mfd-core.c | 5 ++++- > include/linux/mfd/core.h | 3 +++ > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c > index 1ade4c8..74bc895 100644 > --- a/drivers/mfd/mfd-core.c > +++ b/drivers/mfd/mfd-core.c > @@ -177,7 +177,10 @@ static int mfd_add_device(struct device *parent, int id, > > if (parent->of_node && cell->of_compatible) { > for_each_child_of_node(parent->of_node, np) { > - if (of_device_is_compatible(np, cell->of_compatible)) { > + if (of_device_is_compatible(np, cell->of_compatible) && > + (!cell->of_full_name || > + !strcmp(cell->of_full_name, > + of_node_full_name(np)))) { > pdev->dev.of_node = np; > break; That is some ugly, squashed up code. If we end up accepting this, I suggest flattening this out a bit. ... but we'll cross that bridge when we come to it. > diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h > index 99c0395..470f6cb 100644 > --- a/include/linux/mfd/core.h > +++ b/include/linux/mfd/core.h > @@ -55,6 +55,9 @@ struct mfd_cell { > */ > const char *of_compatible; > > + /* Optionally match against a specific device of a given type */ > + const char *of_full_name; > + Can you give me an example for when this might be useful? > /* Matches ACPI */ > const struct mfd_cell_acpi_match *acpi_match; > -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-05 6:31 ` Lee Jones @ 2019-06-05 16:23 ` Robert Hancock 2019-06-05 18:45 ` Lee Jones 0 siblings, 1 reply; 11+ messages in thread From: Robert Hancock @ 2019-06-05 16:23 UTC (permalink / raw) To: Lee Jones; +Cc: linux-kernel On 2019-06-05 12:31 a.m., Lee Jones wrote: > On Tue, 04 Jun 2019, Robert Hancock wrote: > >> Previously the MFD core supported assigning OF nodes to created MFD >> devices, but relied solely on matching the of_compatible string. This >> would result in devices being potentially assigned the wrong node if >> there are multiple devices with the same compatible string within a >> multifunction device. >> >> Add support for matching the full name of the node in the MFD cell >> definition, so that we can match against a specific instance of a >> device. If this is not specified, we match just based on the >> compatible string, as before. >> >> Signed-off-by: Robert Hancock <hancock@sedsystems.ca> >> --- >> drivers/mfd/mfd-core.c | 5 ++++- >> include/linux/mfd/core.h | 3 +++ >> 2 files changed, 7 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c >> index 1ade4c8..74bc895 100644 >> --- a/drivers/mfd/mfd-core.c >> +++ b/drivers/mfd/mfd-core.c >> @@ -177,7 +177,10 @@ static int mfd_add_device(struct device *parent, int id, >> >> if (parent->of_node && cell->of_compatible) { >> for_each_child_of_node(parent->of_node, np) { >> - if (of_device_is_compatible(np, cell->of_compatible)) { >> + if (of_device_is_compatible(np, cell->of_compatible) && >> + (!cell->of_full_name || >> + !strcmp(cell->of_full_name, >> + of_node_full_name(np)))) { >> pdev->dev.of_node = np; >> break; > > That is some ugly, squashed up code. > > If we end up accepting this, I suggest flattening this out a bit. > > ... but we'll cross that bridge when we come to it. Yes, that if statement could be broken up to make it more readable. Will fix in a next version assuming the concept is acceptable. > >> diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h >> index 99c0395..470f6cb 100644 >> --- a/include/linux/mfd/core.h >> +++ b/include/linux/mfd/core.h >> @@ -55,6 +55,9 @@ struct mfd_cell { >> */ >> const char *of_compatible; >> >> + /* Optionally match against a specific device of a given type */ >> + const char *of_full_name; >> + > > Can you give me an example for when this might be useful? This is an example of some device tree entries for our MFD device: axi_iic_0: i2c@c0000 { compatible = "xlnx,xps-iic-2.00.a"; clocks = <&axi_clk>; clock-frequency = <100000>; interrupts = <7>; #size-cells = <0>; #address-cells = <1>; }; axi_iic_1: i2c@d0000 { compatible = "xlnx,xps-iic-2.00.a"; clocks = <&axi_clk>; clock-frequency = <100000>; interrupts = <8>; #size-cells = <0>; #address-cells = <1>; }; and the corresponding MFD cells: { .name = "axi_iic_0", .of_compatible = "xlnx,xps-iic-2.00.a", .of_full_name = "i2c@c0000", .num_resources = ARRAY_SIZE(dbe_i2c1_resources), .resources = dbe_i2c1_resources }, { .name = "axi_iic_1", .of_compatible = "xlnx,xps-iic-2.00.a", .of_full_name = "i2c@d0000", .num_resources = ARRAY_SIZE(dbe_i2c2_resources), .resources = dbe_i2c2_resources }, Without having the .of_full_name support, both MFD cells ended up wrongly matching against the i2c@c0000 device tree node since we just picked the first one where of_compatible matched. -- Robert Hancock Senior Software Developer SED Systems, a division of Calian Ltd. Email: hancock@sedsystems.ca ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-05 16:23 ` Robert Hancock @ 2019-06-05 18:45 ` Lee Jones 2019-06-05 19:26 ` Robert Hancock 0 siblings, 1 reply; 11+ messages in thread From: Lee Jones @ 2019-06-05 18:45 UTC (permalink / raw) To: Robert Hancock; +Cc: linux-kernel On Wed, 05 Jun 2019, Robert Hancock wrote: > On 2019-06-05 12:31 a.m., Lee Jones wrote: > > On Tue, 04 Jun 2019, Robert Hancock wrote: > > > >> Previously the MFD core supported assigning OF nodes to created MFD > >> devices, but relied solely on matching the of_compatible string. This > >> would result in devices being potentially assigned the wrong node if > >> there are multiple devices with the same compatible string within a > >> multifunction device. > >> > >> Add support for matching the full name of the node in the MFD cell > >> definition, so that we can match against a specific instance of a > >> device. If this is not specified, we match just based on the > >> compatible string, as before. > >> > >> Signed-off-by: Robert Hancock <hancock@sedsystems.ca> > >> --- > >> drivers/mfd/mfd-core.c | 5 ++++- > >> include/linux/mfd/core.h | 3 +++ > >> 2 files changed, 7 insertions(+), 1 deletion(-) > >> > >> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c > >> index 1ade4c8..74bc895 100644 > >> --- a/drivers/mfd/mfd-core.c > >> +++ b/drivers/mfd/mfd-core.c > >> @@ -177,7 +177,10 @@ static int mfd_add_device(struct device *parent, int id, > >> > >> if (parent->of_node && cell->of_compatible) { > >> for_each_child_of_node(parent->of_node, np) { > >> - if (of_device_is_compatible(np, cell->of_compatible)) { > >> + if (of_device_is_compatible(np, cell->of_compatible) && > >> + (!cell->of_full_name || > >> + !strcmp(cell->of_full_name, > >> + of_node_full_name(np)))) { > >> pdev->dev.of_node = np; > >> break; > > > > That is some ugly, squashed up code. > > > > If we end up accepting this, I suggest flattening this out a bit. > > > > ... but we'll cross that bridge when we come to it. > > Yes, that if statement could be broken up to make it more readable. Will > fix in a next version assuming the concept is acceptable. > > > > >> diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h > >> index 99c0395..470f6cb 100644 > >> --- a/include/linux/mfd/core.h > >> +++ b/include/linux/mfd/core.h > >> @@ -55,6 +55,9 @@ struct mfd_cell { > >> */ > >> const char *of_compatible; > >> > >> + /* Optionally match against a specific device of a given type */ > >> + const char *of_full_name; > >> + > > > > Can you give me an example for when this might be useful? > > This is an example of some device tree entries for our MFD device: > > axi_iic_0: i2c@c0000 { > compatible = "xlnx,xps-iic-2.00.a"; > clocks = <&axi_clk>; > clock-frequency = <100000>; > interrupts = <7>; > #size-cells = <0>; > #address-cells = <1>; > }; > > axi_iic_1: i2c@d0000 { > compatible = "xlnx,xps-iic-2.00.a"; > clocks = <&axi_clk>; > clock-frequency = <100000>; > interrupts = <8>; > #size-cells = <0>; > #address-cells = <1>; > }; > > and the corresponding MFD cells: > > { > .name = "axi_iic_0", > .of_compatible = "xlnx,xps-iic-2.00.a", > .of_full_name = "i2c@c0000", > .num_resources = ARRAY_SIZE(dbe_i2c1_resources), > .resources = dbe_i2c1_resources > }, > { > .name = "axi_iic_1", > .of_compatible = "xlnx,xps-iic-2.00.a", > .of_full_name = "i2c@d0000", > .num_resources = ARRAY_SIZE(dbe_i2c2_resources), > .resources = dbe_i2c2_resources > }, > > Without having the .of_full_name support, both MFD cells ended up > wrongly matching against the i2c@c0000 device tree node since we just > picked the first one where of_compatible matched. What is contained in each of their resources? -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-05 18:45 ` Lee Jones @ 2019-06-05 19:26 ` Robert Hancock 2019-06-06 5:27 ` Lee Jones 0 siblings, 1 reply; 11+ messages in thread From: Robert Hancock @ 2019-06-05 19:26 UTC (permalink / raw) To: Lee Jones; +Cc: linux-kernel On 2019-06-05 12:45 p.m., Lee Jones wrote: >>>> diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h >>>> index 99c0395..470f6cb 100644 >>>> --- a/include/linux/mfd/core.h >>>> +++ b/include/linux/mfd/core.h >>>> @@ -55,6 +55,9 @@ struct mfd_cell { >>>> */ >>>> const char *of_compatible; >>>> >>>> + /* Optionally match against a specific device of a given type */ >>>> + const char *of_full_name; >>>> + >>> >>> Can you give me an example for when this might be useful? >> >> This is an example of some device tree entries for our MFD device: >> >> axi_iic_0: i2c@c0000 { >> compatible = "xlnx,xps-iic-2.00.a"; >> clocks = <&axi_clk>; >> clock-frequency = <100000>; >> interrupts = <7>; >> #size-cells = <0>; >> #address-cells = <1>; >> }; >> >> axi_iic_1: i2c@d0000 { >> compatible = "xlnx,xps-iic-2.00.a"; >> clocks = <&axi_clk>; >> clock-frequency = <100000>; >> interrupts = <8>; >> #size-cells = <0>; >> #address-cells = <1>; >> }; >> >> and the corresponding MFD cells: >> >> { >> .name = "axi_iic_0", >> .of_compatible = "xlnx,xps-iic-2.00.a", >> .of_full_name = "i2c@c0000", >> .num_resources = ARRAY_SIZE(dbe_i2c1_resources), >> .resources = dbe_i2c1_resources >> }, >> { >> .name = "axi_iic_1", >> .of_compatible = "xlnx,xps-iic-2.00.a", >> .of_full_name = "i2c@d0000", >> .num_resources = ARRAY_SIZE(dbe_i2c2_resources), >> .resources = dbe_i2c2_resources >> }, >> >> Without having the .of_full_name support, both MFD cells ended up >> wrongly matching against the i2c@c0000 device tree node since we just >> picked the first one where of_compatible matched. > > What is contained in each of their resources? These are the resource entries for those two devices: static const struct resource dbe_i2c1_resources[] = { { .start = 0xc0000, .end = 0xcffff, .name = "xi2c1_regs", .flags = IORESOURCE_MEM, .desc = IORES_DESC_NONE }, }; static const struct resource dbe_i2c2_resources[] = { { .start = 0xd0000, .end = 0xdffff, .name = "xi2c2_regs", .flags = IORESOURCE_MEM, .desc = IORES_DESC_NONE }, }; Ideally the IO memory resource entries would be picked up and mapped through the device tree as well, as they are with the interrupts, but I haven't yet found the device tree magic that would allow that to happen yet, if it's possible. The setup we have has a number of peripherals on an AXI bus which are behind a PCIe to AXI bridge, and we're using mfd to instantiate each of those AXI devices under the PCIe device. -- Robert Hancock Senior Software Developer SED Systems, a division of Calian Ltd. Email: hancock@sedsystems.ca ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-05 19:26 ` Robert Hancock @ 2019-06-06 5:27 ` Lee Jones 2019-06-06 15:33 ` Robert Hancock 0 siblings, 1 reply; 11+ messages in thread From: Lee Jones @ 2019-06-06 5:27 UTC (permalink / raw) To: Robert Hancock; +Cc: linux-kernel On Wed, 05 Jun 2019, Robert Hancock wrote: > On 2019-06-05 12:45 p.m., Lee Jones wrote: > >>>> diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h > >>>> index 99c0395..470f6cb 100644 > >>>> --- a/include/linux/mfd/core.h > >>>> +++ b/include/linux/mfd/core.h > >>>> @@ -55,6 +55,9 @@ struct mfd_cell { > >>>> */ > >>>> const char *of_compatible; > >>>> > >>>> + /* Optionally match against a specific device of a given type */ > >>>> + const char *of_full_name; > >>>> + > >>> > >>> Can you give me an example for when this might be useful? > >> > >> This is an example of some device tree entries for our MFD device: > >> > >> axi_iic_0: i2c@c0000 { > >> compatible = "xlnx,xps-iic-2.00.a"; > >> clocks = <&axi_clk>; > >> clock-frequency = <100000>; > >> interrupts = <7>; > >> #size-cells = <0>; > >> #address-cells = <1>; > >> }; > >> > >> axi_iic_1: i2c@d0000 { > >> compatible = "xlnx,xps-iic-2.00.a"; > >> clocks = <&axi_clk>; > >> clock-frequency = <100000>; > >> interrupts = <8>; > >> #size-cells = <0>; > >> #address-cells = <1>; > >> }; > >> > >> and the corresponding MFD cells: > >> > >> { > >> .name = "axi_iic_0", > >> .of_compatible = "xlnx,xps-iic-2.00.a", > >> .of_full_name = "i2c@c0000", > >> .num_resources = ARRAY_SIZE(dbe_i2c1_resources), > >> .resources = dbe_i2c1_resources > >> }, > >> { > >> .name = "axi_iic_1", > >> .of_compatible = "xlnx,xps-iic-2.00.a", > >> .of_full_name = "i2c@d0000", > >> .num_resources = ARRAY_SIZE(dbe_i2c2_resources), > >> .resources = dbe_i2c2_resources > >> }, > >> > >> Without having the .of_full_name support, both MFD cells ended up > >> wrongly matching against the i2c@c0000 device tree node since we just > >> picked the first one where of_compatible matched. > > > > What is contained in each of their resources? > > These are the resource entries for those two devices: > > static const struct resource dbe_i2c1_resources[] = { > { > .start = 0xc0000, > .end = 0xcffff, > .name = "xi2c1_regs", > .flags = IORESOURCE_MEM, > .desc = IORES_DESC_NONE > }, > }; > > static const struct resource dbe_i2c2_resources[] = { > { > .start = 0xd0000, > .end = 0xdffff, > .name = "xi2c2_regs", > .flags = IORESOURCE_MEM, > .desc = IORES_DESC_NONE > }, > }; This is your problem. You are providing the memory resources through *both* DT and MFD. I don't believe I've seen your MFD driver, but it looks like it's probably not required at all. Just allow DT to probe each of your child devices. You can obtain the IO memory from there directly using the usual platform_get_resource() calls. > Ideally the IO memory resource entries would be picked up and mapped > through the device tree as well, as they are with the interrupts, but I > haven't yet found the device tree magic that would allow that to happen > yet, if it's possible. The setup we have has a number of peripherals on > an AXI bus which are behind a PCIe to AXI bridge, and we're using mfd to > instantiate each of those AXI devices under the PCIe device. > -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-06 5:27 ` Lee Jones @ 2019-06-06 15:33 ` Robert Hancock 2019-06-10 8:08 ` Lee Jones 0 siblings, 1 reply; 11+ messages in thread From: Robert Hancock @ 2019-06-06 15:33 UTC (permalink / raw) To: Lee Jones; +Cc: linux-kernel On 2019-06-05 11:27 p.m., Lee Jones wrote: >>>> Without having the .of_full_name support, both MFD cells ended up >>>> wrongly matching against the i2c@c0000 device tree node since we just >>>> picked the first one where of_compatible matched. >>> >>> What is contained in each of their resources? >> >> These are the resource entries for those two devices: >> >> static const struct resource dbe_i2c1_resources[] = { >> { >> .start = 0xc0000, >> .end = 0xcffff, >> .name = "xi2c1_regs", >> .flags = IORESOURCE_MEM, >> .desc = IORES_DESC_NONE >> }, >> }; >> >> static const struct resource dbe_i2c2_resources[] = { >> { >> .start = 0xd0000, >> .end = 0xdffff, >> .name = "xi2c2_regs", >> .flags = IORESOURCE_MEM, >> .desc = IORES_DESC_NONE >> }, >> }; > > This is your problem. You are providing the memory resources through > *both* DT and MFD. I don't believe I've seen your MFD driver, but it > looks like it's probably not required at all. Just allow DT to probe > each of your child devices. You can obtain the IO memory from there > directly using the usual platform_get_resource() calls. As far as I can tell, the DT child devices underneath a PCIe device don't get probed and drivers loaded automatically - possibly for valid reasons. The MFD driver appears to be required in order to actually get drivers attached to those DT nodes. Right now those devices are ending up with no memory resources unless they are injected through the MFD cells. It would be handy if the memory resources were mapped automatically from the PCIe BARs to the sub-devices, to avoid duplicating information in the DT and the driver, but even if that was solved it wouldn't avoid the need for this patch, as the devices would still end up attached to the wrong DT node and pick up the wrong properties. The other reason we need the MFD driver is we are implementing an IRQ domain to map the interrupts from the PCIe device to the child nodes, and using some of those callbacks to poke other registers on the PCIe to assist with converting the level-triggered AXI interrupts to edge-triggered MSIs. This is what the outer DT leading up to what I showed earlier looks like. &pcie { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_pcie>; reset-gpio = <&gpio7 12 GPIO_ACTIVE_LOW>; status = "okay"; pci_rootport: pcie@0,0 { reg = <0x83000000 0 0 0 0>; #address-cells = <3>; #size-cells = <2>; ranges; fpga_pcie: pcie@1,0 { reg = <0x2010000 0 0 0 0>; #address-cells = <1>; #size-cells = <1>; interrupt-controller; #interrupt-cells = <1>; ... axi_iic_0: i2c@c0000 { compatible = "xlnx,xps-iic-2.00.a"; clocks = <&axi_clk>; clock-frequency = <100000>; interrupts = <7>; #size-cells = <0>; #address-cells = <1>; }; axi_iic_1: i2c@d0000 { compatible = "xlnx,xps-iic-2.00.a"; clocks = <&axi_clk>; clock-frequency = <100000>; interrupts = <8>; #size-cells = <0>; #address-cells = <1>; }; }; }; }; > >> Ideally the IO memory resource entries would be picked up and mapped >> through the device tree as well, as they are with the interrupts, but I >> haven't yet found the device tree magic that would allow that to happen >> yet, if it's possible. The setup we have has a number of peripherals on >> an AXI bus which are behind a PCIe to AXI bridge, and we're using mfd to >> instantiate each of those AXI devices under the PCIe device. >> > -- Robert Hancock Senior Software Developer SED Systems, a division of Calian Ltd. Email: hancock@sedsystems.ca ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type 2019-06-06 15:33 ` Robert Hancock @ 2019-06-10 8:08 ` Lee Jones 0 siblings, 0 replies; 11+ messages in thread From: Lee Jones @ 2019-06-10 8:08 UTC (permalink / raw) To: Robert Hancock; +Cc: linux-kernel On Thu, 06 Jun 2019, Robert Hancock wrote: > On 2019-06-05 11:27 p.m., Lee Jones wrote: > >>>> Without having the .of_full_name support, both MFD cells ended up > >>>> wrongly matching against the i2c@c0000 device tree node since we just > >>>> picked the first one where of_compatible matched. > >>> > >>> What is contained in each of their resources? > >> > >> These are the resource entries for those two devices: > >> > >> static const struct resource dbe_i2c1_resources[] = { > >> { > >> .start = 0xc0000, > >> .end = 0xcffff, > >> .name = "xi2c1_regs", > >> .flags = IORESOURCE_MEM, > >> .desc = IORES_DESC_NONE > >> }, > >> }; > >> > >> static const struct resource dbe_i2c2_resources[] = { > >> { > >> .start = 0xd0000, > >> .end = 0xdffff, > >> .name = "xi2c2_regs", > >> .flags = IORESOURCE_MEM, > >> .desc = IORES_DESC_NONE > >> }, > >> }; > > > > This is your problem. You are providing the memory resources through > > *both* DT and MFD. I don't believe I've seen your MFD driver, but it > > looks like it's probably not required at all. Just allow DT to probe > > each of your child devices. You can obtain the IO memory from there > > directly using the usual platform_get_resource() calls. > > As far as I can tell, the DT child devices underneath a PCIe device > don't get probed and drivers loaded automatically - possibly for valid > reasons. The MFD driver appears to be required in order to actually get > drivers attached to those DT nodes. You need to call of_platform_populate(). -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog ^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 2/2] mfd: core: Set fwnode for created devices 2019-06-04 22:35 [PATCH 0/2] MFD core updates for device tree binding support Robert Hancock 2019-06-04 22:35 ` [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type Robert Hancock @ 2019-06-04 22:35 ` Robert Hancock 2019-06-05 6:31 ` Lee Jones 1 sibling, 1 reply; 11+ messages in thread From: Robert Hancock @ 2019-06-04 22:35 UTC (permalink / raw) To: linux-kernel; +Cc: lee.jones, Robert Hancock The logic for setting the of_node on devices created by mfd did not set the fwnode pointer to match, which caused fwnode-based APIs to malfunction on these devices since the fwnode pointer was null. Fix this. Signed-off-by: Robert Hancock <hancock@sedsystems.ca> --- drivers/mfd/mfd-core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 74bc895..228163c 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -182,6 +182,7 @@ static int mfd_add_device(struct device *parent, int id, !strcmp(cell->of_full_name, of_node_full_name(np)))) { pdev->dev.of_node = np; + pdev->dev.fwnode = &np->fwnode; break; } } -- 1.8.3.1 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] mfd: core: Set fwnode for created devices 2019-06-04 22:35 ` [PATCH 2/2] mfd: core: Set fwnode for created devices Robert Hancock @ 2019-06-05 6:31 ` Lee Jones 0 siblings, 0 replies; 11+ messages in thread From: Lee Jones @ 2019-06-05 6:31 UTC (permalink / raw) To: Robert Hancock; +Cc: linux-kernel On Tue, 04 Jun 2019, Robert Hancock wrote: > The logic for setting the of_node on devices created by mfd did not set > the fwnode pointer to match, which caused fwnode-based APIs to > malfunction on these devices since the fwnode pointer was null. Fix > this. > > Signed-off-by: Robert Hancock <hancock@sedsystems.ca> > --- > drivers/mfd/mfd-core.c | 1 + > 1 file changed, 1 insertion(+) Applied, thanks. -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2019-06-10 8:09 UTC | newest] Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2019-06-04 22:35 [PATCH 0/2] MFD core updates for device tree binding support Robert Hancock 2019-06-04 22:35 ` [PATCH 1/2] mfd: core: Support multiple OF child devices of the same type Robert Hancock 2019-06-05 6:31 ` Lee Jones 2019-06-05 16:23 ` Robert Hancock 2019-06-05 18:45 ` Lee Jones 2019-06-05 19:26 ` Robert Hancock 2019-06-06 5:27 ` Lee Jones 2019-06-06 15:33 ` Robert Hancock 2019-06-10 8:08 ` Lee Jones 2019-06-04 22:35 ` [PATCH 2/2] mfd: core: Set fwnode for created devices Robert Hancock 2019-06-05 6:31 ` Lee Jones
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