On Wed, Jan 28, 2015 at 06:11:50PM -0800, Stephen Boyd wrote:
<snip>
> > Required properties:
> > -- compatible: must contain "qcom,gsbi-v1.0.0" for APQ8064/IPQ8064
> > +- compatible: Should contain:
> > + "qcom,gsbi-ipq8064" for IPQ8064
> > + "qcom,gsbi-apq8064" for APQ8064
> > + "qcom,gsbi-msm8960" for MSM8960
> > + "qcom,gsbi-msm8660" for MSM8660
>
> Hopefully this is not necessary, but if it is we should leave the
> old compatible here and say it's deprecated or something.
Right. I went back and forth with the tcsr vs gsbi. If change the compats I'll
put in a deprecated.
> > - reg: Address range for GSBI registers
> > - clocks: required clock
> > - clock-names: must contain "iface" entry
> > - qcom,mode : indicates MUX value for configuration of the serial interface.
> > Please reference dt-bindings/soc/qcom,gsbi.h for valid mux values.
> > +- qcom,gsbi-num: indicates GSBI instance number
>
> Why not use DT aliases for this? Then other drivers or more
> generic code can search for a gsbiN alias for the particular gsbi
> node. No qcom specific property.
Yeah thats cleaner. I'll do that.
>
> > +- syscon-tcsr: indicates phandle of TCSR syscon node
>
> Make this optional but required if any child nodes use dma?
To enforce that I'd have to determine that a child has a dmas. I guess that
isn't so bad.
<snip>
> > static int gsbi_probe(struct platform_device *pdev)
> > {
> > struct device_node *node = pdev->dev.of_node;
> > + const struct of_device_id *match;
> > struct resource *res;
> > void __iomem *base;
> > struct gsbi_info *gsbi;
> > + u32 gsbi_num, i, val;
>
> i should be int
>
> > + struct crci_config *config;
>
> const?
will fix both.
> >
> > gsbi = devm_kzalloc(&pdev->dev, sizeof(*gsbi), GFP_KERNEL);
> >
> > @@ -45,6 +152,20 @@ static int gsbi_probe(struct platform_device *pdev)
> > if (IS_ERR(base))
> > return PTR_ERR(base);
> >
> > + gsbi->tcsr = syscon_regmap_lookup_by_phandle(node, "syscon-tcsr");
> > + if (IS_ERR(gsbi->tcsr))
> > + return -EINVAL;
> > +
> > + if (of_property_read_u32(node, "qcom,gsbi-num", &gsbi_num)) {
> > + dev_err(&pdev->dev, "missing gsbi instance number\n");
> > + return -EINVAL;
> > + }
>
> As said before, aliases would do the job the same and not require
> some qcom specific property.
Yup. will fix.
> > +
> > + if (!gsbi_num || gsbi_num > MAX_GSBI) {
> > + dev_err(&pdev->dev, "invalid gsbi number\n");
> > + return -EINVAL;
> > + }
> > +
> > if (of_property_read_u32(node, "qcom,mode", &gsbi->mode)) {
> > dev_err(&pdev->dev, "missing mode configuration\n");
> > return -EINVAL;
> > @@ -64,6 +185,26 @@ static int gsbi_probe(struct platform_device *pdev)
> > writel_relaxed((gsbi->mode << GSBI_PROTOCOL_SHIFT) | gsbi->crci,
> > base + GSBI_CTRL_REG);
> >
> > + /*
> > + * modify tcsr to reflect mode and ADM CRCI mux
> > + * Each gsbi contains a pair of bits, one for RX and one for TX
> > + * SPI mode requires both bits cleared, otherwise they are set
> > + */
> > + match = of_match_node(gsbi_dt_match, node);
>
> Why not match the config to the TCSR compatible string? Wouldn't
> that more accurately reflect that we need to set different bits
> depending on which type of TCSR we're using? The version of GSBI
> hardware is not actually changing in every different SoC so I
> don't see why we want to change the compatible there just because
> the TCSR register layout changed.
That is true. However, with the gsbi compat, I avoid doing a match multiple
times and get the table I need immediately. The alternative is N checks or
pulling the compat strings and comparing them to get the right table.
> > + config = (struct crci_config *)match->data;
>
> Cast shouldn't be necessary if config is const?
will check if that works
> > +
> > + if (config)
> > + for (i = 0; i < config->num_rows; i++) {
> > + if (gsbi->mode == GSBI_PROT_SPI)
>
> Doesn't I2C need the same treatment (anything in QUP really)?
> Maybe the logic could be changed to check for gsbi->crci ==
> GSBI_CRCI_QUP?
Nope. I2C doesn't support DMA when ADM is the controller. It's only SPI or
UART.
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