Messages in this thread | | | From | Andy Shevchenko <> | Date | Tue, 16 May 2023 00:05:32 +0300 | Subject | Re: [PATCH v14 8/8] soc: amd: Add support for AMD Pensando SoC Controller |
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On Mon, May 15, 2023 at 9:18 PM Brad Larson <blarson@amd.com> wrote: > > The Pensando SoC controller is a SPI connected companion device > that is present in all Pensando SoC board designs. The essential > board management registers are accessed on chip select 0 with > board mgmt IO support accessed using additional chip selects.
...
> +#include <linux/cdev.h> > +#include <linux/device.h> > +#include <linux/err.h> > +#include <linux/init.h> > +#include <linux/mod_devicetable.h> > +#include <linux/module.h> > +#include <linux/mutex.h>
> +#include <linux/of.h>
Unneeded inclusion.
> +#include <linux/reset-controller.h> > +#include <linux/spi/spi.h>
...
> + u8 tx_buf[PENCTRL_MAX_MSG_LEN]; > + u8 rx_buf[PENCTRL_MAX_MSG_LEN];
Does it need to be DMA-capable?
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> + spi->chip_select = current_cs; > + spi->cs_gpiod = spi->controller->cs_gpiods[current_cs];
Nowadays these require API calls instead of direct assignments.
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> +static int penctrl_release(struct inode *inode, struct file *filp) > +{ > + filp->private_data = NULL; > + return 0; > +}
Is it possible to unload the module without releasing the device node?
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> + u8 txbuf[3]; > + u8 rxbuf[1];
Same question about DMA.
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> + ret = spi_sync(spi, &m);
> + if (ret == 0) > + *val = rxbuf[0]; > + > + return ret;
Can also be written in more usual way:
if (ret) return ret; ... return 0;
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> + u8 txbuf[4];
DMA?
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> + spi->chip_select = 0; > + spi->cs_gpiod = spi->controller->cs_gpiods[0];
Setter APIs.
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> + spi->chip_select = 0; > + spi->cs_gpiod = spi->controller->cs_gpiods[0];
Ditto.
> + ret = device_property_read_u32(spi->dev.parent, "num-cs", &num_cs); > + if (ret) > + return dev_err_probe(&spi->dev, ret, > + "number of chip-selects not defined\n");
Hmm... Shouldn't SPI core take care of this in a generic way? Yes, I understand that you need the number for the allocation, but I would expect something like spi_fw_get_num_cs() to exist (seems not?).
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> + penctrl->rcdev.of_node = spi->dev.of_node;
Use device_set_node(). It helps to modify the data types beneath.
-- With Best Regards, Andy Shevchenko
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